CoStar Group

You would develop tools for proprietary platforms, write maintainable code, participate in code reviews and automated testing, and contribute to cross-functional design discussions. | You must be pursuing a related bachelor's degree with a December 2026 to June 2027 graduation date, have at least a 3.0 GPA, and bring at least two months of relevant internship or co-op experience. | Associate Software Engineer - Irvine, CA Job Description Associate Software Engineer – Irvine, CA Company Overview: CoStar Group (NASDAQ: CSGP) is a leading global provider of commercial and residential real estate information, analytics, and online marketplaces. Included in the S&P 500 Index, CoStar Group is on a mission to digitize the world’s real estate, empowering all people to discover properties, insights and connections that improve their businesses and lives. We have been living and breathing the world of real estate information and online marketplaces for over 35 years, giving us the perspective to create truly unique and valuable offerings to our customers. We’ve continually refined, transformed, and perfected our approach to our business, creating a language that has become standard in our industry, for our customers, and even our competitors. We continue that effort today and are always working to improve and drive innovation. This is how we deliver for our customers, our employees, and investors. By equipping the brightest minds with the best resources available, we provide an invaluable edge in real estate. Learn more about CoStar. Role Description: We’re looking for an Associate Software Engineer with a passion for designing and building modern web applications. This role develops tools that power CoStar Group’s proprietary platform, supporting sales and research teams across our portfolio of brands - including Homes.com, CoStar.com, Apartments.com, and LoopNet.com. At CoStar Group, we invest in early-career talent by providing hands-on learning opportunities, meaningful responsibilities, and clear pathways for professional growth. You'll be empowered to contribute ideas, solve complex challenges, and develop both the technical and collaborative skills needed to thrive in a fast-paced, innovative environment. CoStar Group offers competitive compensation, comprehensive benefits, performance-based career advancement, and the opportunity to help shape products that serve millions of users. This position is located in Irvine, CA and offers a schedule of Monday to Thursday in office and the option to work from home on Friday. What You’ll do: At CoStar Group, our engineering teams build innovative, scalable solutions while following industry best practices for software development. You'll collaborate with experienced engineers to write clean, maintainable code, develop automated tests, participate in code reviews, and contribute to cross-functional design and planning discussions. Working alongside talented teammates, you'll gain hands-on experience with modern technologies including but not limited to leading JavaScript programming language and frameworks such as React, Vue, and Angular, Typescript, backend development language .NET, .NETCore, SQL, NoSQL, Postgres, AWS, Kafka, Databricks, and emerging AI-powered development tools like GitHub Copilot and Claude Code. We're looking for curious, adaptable students who are eager to learn, embrace new technologies, and apply strong software engineering fundamentals to solve meaningful business challenges. This role provides the building blocks for a strong and rewarding technical career, offering mentorship, real-world experience, and continuous opportunities for professional growth. Basic Qualifications: Currently pursuing a bachelor’s degree from an accredited, not-for-profit university or college in Computer Science, Software Engineering, or a comparable major. Must have an expected graduation date of December 2026 - June 2027. Minimum 3.0 cumulative GPA. At least 2 months of previous relevant internship or co-op experience. Experience applying software engineering fundamentals through coursework, projects, internships, or work experience. Ability to discuss prior internship, project, or academic work, including the problem solved, technical approach, collaboration, and outcomes. Preferred Qualifications and Experiences: Experience writing understandable, maintainable, and well-documented code. Interest in learning new technologies and building high-quality software. Demonstrated initiative and collaboration through academic, internship, extracurricular, or team-based experiences. Familiarity with Agile development practices, the Software Development Lifecycle, APIs, web services, or application design concepts. Exposure to programming languages, databases, cloud concepts, AI/machine learning, frameworks, or other technical tools through coursework, projects, internships, or personal learning. What’s in it for you? When you join CoStar Group, you’ll experience a collaborative and innovative culture working alongside the best and brightest to empower our people and customers to succeed. We offer you generous compensation and performance-based incentives. CoStar Group also invests in your professional and academic growth with internal training and tuition reimbursement. Our benefits package includes (but is not limited to): Comprehensive healthcare coverage: Medical / Vision / Dental / Prescription Drug Life, legal, and supplementary insurance Virtual and in person mental health counseling services for individuals and family Commuter and parking benefits 401(K) retirement plan with matching contributions Employee stock purchase plan Paid time off Tuition reimbursement On-site fitness center and/or reimbursed fitness center membership costs (location dependent) Access to CoStar Group’s Employee Resource Groups Complimentary gourmet coffee, tea, hot chocolate, fresh fruit, and other healthy snacks The final salary or hourly rate offered for this role will fall within the range set forth below based on a variety of factors, including but not limited to, geographic location, skills, and competencies. Base Compensation: $100,000 - $105,000 annually We welcome all qualified candidates who are currently eligible to work full-time in the United States to apply. However, please note that CoStar Group is not able to provide visa sponsorship for this position. CoStar Group is an Equal Employment Opportunity Employer; we maintain a drug-free workplace and perform pre-employment substance abuse testing

Design and implement AI-powered software solutions and intelligent workflows to enhance applications and systems. | Bachelor's degree with 6+ years experience in object-oriented languages, distributed systems, AI technologies, C#, and web frameworks. | Senior Software Engineer Job Description CoStar Group (NASDAQ: CSGP) is a leading global provider of commercial and residential real estate information, analytics, and online marketplaces. Included in the S&P 500 Index, CoStar Group is on a mission to digitize the world’s real estate, empowering all people to discover properties, insights and connections that improve their businesses and lives. We have been living and breathing the world of real estate information and online marketplaces for over 35 years, giving us the perspective to create truly unique and valuable offerings to our customers. We’ve continually refined, transformed, and perfected our approach to our business, creating a language that has become standard in our industry, for our customers, and even our competitors. We continue that effort today and are always working to improve and drive innovation. This is how we deliver for our customers, our employees, and investors. By equipping the brightest minds with the best resources available, we provide an invaluable edge in real estate. Our team is responsible for building software in support of CoStar Group's sales teams. We think big, building innovative CRM features that empower our sales teams' success. We are a collaborative group with a mix of native mobile, data, API / platform, and front-end skills, and we are working to drive our company's future with our proprietary CRM system. We are hiring a Senior Software Engineer to join our Sales Development team and contribute to our AI initiatives within our CRM platform. CoStar is investing heavily in artificial intelligence to accelerate software delivery, improve platform observability, automate research and business workflows, enhance product experiences through intelligent agents and skills, and improve data quality across enterprise systems. Successful candidates will demonstrate a willingness to learn, adopt, and apply AI technologies responsibly to solve complex business and engineering challenges. This position is located in Richmond, VA and offers a schedule of Monday to Thursday in office and the option to work from home on Friday. Responsibilities Building customer-facing web applications using React and TypeScript. Design and implement AI-powered software solutions that enhance the customer experience, improve platform intelligence, and unlock new product capabilities across CoStar brands. Build and integrate AI skills, agents, tools, and intelligent workflows into internal systems and customer-facing applications. Produce bullet-proof code that is robust, efficient, and maintainable; our primary tools are C#, .NET Framework, SQL Server, AWS. Utilize AI models to enhance monitoring, replayability, observability, and diagnostic capabilities to improve system reliability, accelerate problem resolution, and reduce operational risk. Implement telemetry-driven solutions that proactively identify anomalies, performance bottlenecks, and potential customer-impacting issues. Drive and lead software design, development standards, and code reviews. Build intelligent automation solutions that streamline research workflows, improve information discovery, and increase operational efficiency across business functions. Collaborate with Product, Sales, and Data teams to identify opportunities where AI-driven automation can create business value and improve decision-making. Continually evaluate emerging technologies to identify opportunities, trends, and best practices that can be leveraged to strengthen CoStar’s technology platform and develop best practices. Develop comprehensive application testing procedures to ensure high-quality applications for tens of thousands of users. Basic Qualifications Bachelor’s Degree required from an accredited, not-for-profit, in-person college / university 6+ years of software development experience with OOP languages Demonstrated experience in architecting, designing and building large scale distributed, service-oriented systems and web applications in an agile environment Experience building RESTful APIs using C# Proficient understanding of code versioning tools such as Git. Understanding AI technologies and has hands-on experience in AI adoption and development. Familiarity with large language models (LLMs), prompt engineering, or agent-based architectures. Familiarity with CI/CD deployment processes A track record of commitment to prior employers Preferred Qualifications and Skills Strong communication skills (to both business and technical partners). SQL and database development knowledge. Familiarity with AWS PaaS services such as Lambda, DynamoDB, and SQS. Data modeling experience from conceptual, logical, and physical designs. Experience implementing AI agents, workflow automation platforms, or intelligent search solutions. Experience applying AI-assisted software development practices to improve engineering productivity and code quality. What's in it for you? When you join CoStar Group, you’ll experience a collaborative and innovative culture working alongside the best and brightest to empower our people and customers to succeed. We offer you generous compensation and performance-based incentives. CoStar Group also invests in your professional and academic growth with internal training and tuition reimbursement. Our benefits package includes (but is not limited to): Comprehensive healthcare coverage: Medical / Vision / Dental / Prescription Drug Life, legal, and supplementary insurance Virtual and in-person mental health counseling services for individuals and family Commuter and parking benefits 401(K) retirement plan with matching contributions Employee stock purchase plan Paid time off Tuition reimbursement On-site fitness center and/or reimbursed fitness center membership costs (location dependent) Access to CoStar Group’s Employee Resource Groups Complimentary gourmet coffee, tea, hot chocolate, fresh fruit, and other healthy snacks The final salary or hourly rate offered for this role will fall within the range set forth below based on a variety of factors, including but not limited to, geographic location, skills, and competencies. Base Compensation: $130,000 - $170,000 annually We welcome all qualified candidates who are currently eligible to work full-time in the United States to apply. However, please note that CoStar Group is not able to provide visa sponsorship for this position. #LI-KW1 CoStar Group is an Equal Employment Opportunity Employer; we maintain a drug-free workplace and perform pre-employment substance abuse testing

Design, build, and maintain production web applications with AI integration and mentor engineering staff. | Bachelor's degree with 6+ years professional experience in React, TypeScript, C#, .NET, SQL, and LLM integration. | Senior Software Engineer - Land.com Job Description Overview: Group (CSGP) is a leading global provider of commercial and residential real estate information, analytics, and online marketplaces. Included in the S&P 500 Index, CoStar Group is on a mission to digitize the world’s real estate, empowering all people to discover properties, insights and connections that improve their businesses and lives. We have been living and breathing the world of real estate information and online marketplaces for over 35 years, giving us the perspective to create truly unique and valuable offerings for our customers. We’ve continually refined, transformed and perfected our approach to our business, creating a language that has become standard in our industry, for our customers, and even our competitors. We continue that effort today and are always working to improve and drive innovation. This is how we deliver for our customers, our employees, and investors. By equipping the brightest minds with the best resources available, we provide an invaluable edge in real estate. About Land.com: The Land.com network offers the largest and most effective marketplaces to discover, buy and sell rural real estate. We connect 12 million active buyers and landowners with the best local real estate professionals every month across three platforms. Learn more about Land.com This role is in our Austin, TX office with a hybrid schedule of 4 days on-site and 1 day work from home. We are currently seeking a full-time Senior Software Engineer focused on AI-driven product development, modern React applications, and practical large language model (LLM) integration. As a senior member of the Land.com engineering team, you will design, build, and support highly performant web applications and AI-enabled experiences that help drive the growth of our Land.com business unit. The ideal candidate combines strong software engineering fundamentals with hands-on experience applying AI-assisted development workflows, integrating LLM capabilities into production systems, and delivering reliable, scalable customer-facing solutions. Key Responsibilities: Design, build, support, and maintain production web applications using React, TypeScript, CSS, JavaScript, C#, .NET, and SQL. Lead the development of AI-enabled product features that integrate LLM capabilities into existing business workflows, user experiences, and application services. Apply senior-level engineering judgment to evaluate where AI creates meaningful customer or operational value and where traditional software solutions are more appropriate. Design and implement LLM integration patterns such as prompt orchestration, structured outputs, tool or API calling, fallback handling, and guardrails. Assist in establishing practices for AI-assisted and LLM-powered features, reliability, latency, cost, and user safety. Analyze technical requirements and design new components, services, web pages, and controls that meet functional, performance, scalability, availability, and maintainability requirements. Apply software design patterns, SOLID principles, secure coding practices, and sound quality management methods to create reusable, maintainable, well-tested application software. Mentor engineers on modern development practices, AI-assisted engineering workflows, code quality, testing strategy, and responsible use of LLM tooling. Create thorough unit, integration, and functional test coverage for the software and AI-enabled features you own. Develop and maintain SQL database scripts, application data access patterns, and supporting services required by product features. Required Skills: Bachelor’s Degree required from an accredited, in-person, not for profit university or college. A track record of commitment to prior employers. 6+ years of professional software development experience in production environments, including ownership of complex systems or product features. Hands-on experience with React, TypeScript, JavaScript ES6+, C#, .NET, and SQL. Practical experience using AI-assisted development tools and workflows to improve engineering productivity, code quality, testing, documentation, or delivery speed. Experience integrating LLM APIs or AI services into application code, including prompt design, structured outputs, error handling, and production monitoring. Experience with software testing practices such as unit, integration, functional, regression, and performance testing. Demonstrated knowledge of SOLID principles, design patterns, API design, and scalable application architecture. Experience working within Kanban-oriented engineering teams with strong collaboration across product, design, QA, and engineering stakeholders. Ability to clearly communicate technical decisions, risks, tradeoffs, and implementation plans within and across teams. Ability to lead work independently, mentor other engineers, manage competing priorities, and deliver high-quality outcomes with minimal supervision. Preferred Skills: Self-starter with a strong product mindset and a desire to solve business problems with the help of others. Deep understanding of React architecture, component design, state management, accessibility, and performance optimization. Experience architecting systems using C#, .NET, SQL, REST APIs, and service-oriented application patterns. Experience with Visual Studio, Azure DevOps, Git, CI/CD pipelines, code review practices, and automated quality gates. Experience with Elasticsearch, OpenSearch, cloud services, or other search and retrieval technologies. Familiarity with responsible AI practices, secure AI integration, data privacy considerations, and guardrails for customer-facing AI features. What’s in it for You When you join CoStar Group, you’ll experience a collaborative and innovative culture working alongside the best and brightest to empower our people and customers to succeed. We offer you generous compensation and performance-based incentives. CoStar Group also invests in your professional and academic growth with internal training, and tuition reimbursement. Our benefits package includes (but is not limited to): Comprehensive healthcare coverage: Medical / Vision / Dental / Prescription Drug Life, legal, and supplementary insurance Virtual and in person mental health counseling services for individuals and family Commuter and parking benefits 401(K) retirement plan with matching contributions Employee stock purchase plan Paid time off Tuition reimbursement On-site fitness center and/or reimbursed fitness center membership costs (location dependent), with yoga studio, Pelotons, personal training, group exercise classes Access to CoStar Group’s Employee Resource Groups Complimentary gourmet coffee, tea, hot chocolate, fresh fruit, and other healthy snacks This position offers an annual salary range from $131,000 - $170,000 determined by relevant skills and experience, in addition to a generous benefits plan. We welcome all qualified candidates who are currently eligible to work full-time in the United States to apply. However, please note that CoStar Group is not able to provide visa sponsorship for this position. #CoStar #LI-CG4 CoStar Group is an Equal Employment Opportunity Employer; we maintain a drug-free workplace and perform pre-employment substance abuse testing

Design and develop scalable software using C# and object-oriented principles, participate in Agile teams, and collaborate on database solutions. | Bachelor's degree with 3+ years in C#/.NET production development, unit testing proficiency, database design skills, and mentoring ability. | Full-Stack Engineer - Apartments.com - Irvine, CA Job Description CoStar Group (NASDAQ: CSGP) is a leading global provider of commercial and residential real estate information, analytics, and online marketplaces. Included in the S&P 500 Index and the NASDAQ 100, CoStar Group is on a mission to digitize the world’s real estate, empowering all people to discover properties, insights and connections that improve their businesses and lives. We have been living and breathing the world of real estate information and online marketplaces for over 35 years, giving us the perspective to create truly unique and valuable offerings to our customers. We’ve continually refined, transformed and perfected our approach to our business, creating a language that has become standard in our industry, for our customers, and even our competitors. We continue that effort today and are always working to improve and drive innovation. This is how we deliver for our customers, our employees, and investors. By equipping the brightest minds with the best resources available, we provide an invaluable edge in real estate. Apartments.com is the nation’s #1 rental marketplace for owners, property managers and consumers. Apartments.com is the network that millions of renters every year rely on to find their new place, is continuing to grow our industry-leading sales force. We provide apartment Property Managers and Owners with a platform to market their property listings and the industry’s most comprehensive virtual tools to attract the most and highest-quality renters. The Apartments.com Network includes Apartments.com, ForRent.com, ApartmentFinder.com, ApartmentHomeLiving.com, and eight other leading rental sites. Our suite of services includes digital advertising, social and reputation management, and market analytic solutions which delivers innovative tools for our customers. Learn more about Apartments.com. Our team is seeking an accomplished Software Engineer to join our team in supporting multiple software products and brands across the organization. You will have a direct impact on highly visible Apartments.com web applications that touch millions of users. You continuously learn emerging technologies and architecture advancements and apply the learnings to improve Apartments’ software products This position is located in Irvine, CA and offers 4 days a week onsite with 1 day work from home. RESPONSIBILITIES Design and develop using Object Oriented design principles and software design patterns to attain high reusability and maintainability. Deep knowledge and experience in writing unit testable software with C# Develop an in-depth understanding of CoStar’s product architecture and frameworks. Maintain and contribute to CoStar’s product platform as necessary. Develop database stored procedures and SQL scripts/ETL jobs that meet CoStar database standards to implement product requirements. Participate and drive continuous improvement within CoStar’s Agile/Scrum teams. Build consensus among different teams working on software development projects. Facilitate discussions among other .NET and database developers to exchange new ideas and improvements. Continually evaluate emerging technologies to identify opportunities, trends and best practices that can be used to strengthen CoStar’s technology platform and development practices. BASIC QUALIFICATIONS Bachelor’s Degree required from an accredited, not-for-profit, in-person college/university A track record of commitment to prior employers 3+ years of production development experience with C# .Net (or .Net Core) A demonstrable track record of building and launching successful products and platforms Deliver products that meet specifications and performance SLA Experienced in unit, performance, and automation testing Deeply understand what drives the business for which you are building software Take an active role in mentoring developers with ability to build consensus PREFERRED QUALIFICATIONS Demonstrate working knowledge Vue, React or Angular in TypeScript Experience in relational database design (MS SQL or MySQL) including performance tuning Experience with AWS S3, SQS, Dynamo, ElastiCache, Apache Kafka and Datadog What’s in it for You When you join CoStar Group, you’ll experience a collaborative and innovative culture working alongside the best and brightest to empower our people and customers to succeed. We offer you generous compensation and performance-based incentives. CoStar Group also invests in your professional and academic growth with internal training, and tuition reimbursement. Our benefits package includes (but is not limited to): Comprehensive healthcare coverage: Medical / Vision / Dental / Prescription Drug Life, legal, and supplementary insurance Virtual and in person mental health counseling services for individuals and family Commuter and parking benefits 401(K) retirement plan with matching contributions Employee stock purchase plan Paid time off Tuition reimbursement On-site fitness center and/or reimbursed fitness center membership costs (location dependent), with yoga studio, Pelotons, personal training, group exercise classes Access to CoStar Group’s Diversity, Equity, & Inclusion Employee Resource Groups Complimentary gourmet coffee, tea, hot chocolate, fresh fruit, and other healthy snacks The final salary or hourly rate offered for this role will fall within the range set forth below on variety of factors, including but not limited to, geographic location, skills, and competencies. Base Compensation: $103,000-$154,000 Annually We welcome all qualified candidates who are currently eligible to work full-time in the United States to apply. However, please note that CoStar Group is not able to provide visa sponsorship for this position. #LI-AV1 #Apartments.com CoStar Group is an Equal Employment Opportunity Employer; we maintain a drug-free workplace and perform pre-employment substance abuse testing

Design and maintain scalable cloud data platforms, data pipelines, and dimensional models with governance and monitoring, collaborating and mentoring across teams. | Bachelor's degree with 6+ years software development experience including Python, PySpark, SQL, cloud databases, and AI/ML integration skills. | Senior Data Engineer - Apartments.com - Irvine, CA Job Description CoStar Group (NASDAQ: CSGP) is a leading global provider of commercial and residential real estate information, analytics, and online marketplaces. Included in the S&P 500 Index, CoStar Group is on a mission to digitize the world’s real estate, empowering all people to discover properties, insights and connections that improve their businesses and lives. We have been living and breathing the world of real estate information and online marketplaces for over 35 years, giving us the perspective to create truly unique and valuable offerings to our customers. We’ve continually refined, transformed and perfected our approach to our business, creating a language that has become standard in our industry, for our customers, and even our competitors. We continue that effort today and are always working to improve and drive innovation. This is how we deliver to our customers, our employees, and investors. By equipping the brightest minds with the best resources available, we provide an invaluable edge in real estate. Apartments.com is the nation’s #1 rental marketplace for owners, property managers and consumers. Apartments.com is the network that millions of renters every year rely on to find their new place, is continuing to grow our industry-leading sales force. We provide apartment Property Managers and Owners with a platform to market their property listings and the industry’s most comprehensive virtual tools to attract the most and highest-quality renters. The Apartments.com Network includes Apartments.com, ForRent.com, ApartmentFinder.com, ApartmentHomeLiving.com, and eight other leading rental sites. Our suite of services includes digital advertising, social and reputation management, and market analytic solutions which delivers innovative tools for our customers. Learn more about Apartments.com. Apartments.com is growing quickly and we’re looking for a Senior Data Engineer to help accelerate our growth. This role will be responsible for helping build out sitewide tracking architecture on Apartments.com and then feeding that data into user-friendly KPI dashboards which track site performance and product usage and provide day-to day insights into consumer behavior. This individual will help build and deliver the data engineering architecture for Apartments.com and work across all departments to provide analysis and insights for future growth. You will be part of various aspects of our data management, ranging from designing and maintaining automated data infrastructure and delivering Data engineering and Analytics solutions to facilitating data access and analysis for key company teams. CoStar is investing heavily in artificial intelligence to accelerate software delivery, improve platform observability, automate research and business workflows, enhance product experiences through intelligent agents and skills, and improve data quality across enterprise systems. Successful candidates will demonstrate a willingness to learn, adopt, and apply AI technologies responsibly to solve complex business and engineering challenges. This position is located in Irvine, CA and offers a schedule of Monday to Thursday in the office and work from home on Fridays. Responsibilities Design and Oversee implementation of dimensional modeling, database design, and cloud data platform structures (e.g., Databricks, Snowflake, BigQuery) Develop data platform framework to build secure data warehouses and data lakehouses applying principles of Medallion Architecture Design, develop, and maintain scalable data pipelines and ETL processes using Databricks, Snowflake, and other AWS services Implement and optimize Spark jobs, data transformations, and data processing workflows in Databricks Building and deploying AI/ML models: Integrate Machine Learning into data pipelines, leverage Databricks ML and AWS ML to develop predictive models and drive business insights Define and Apply AI-assisted software development practices to improve engineering productivity and code quality Understand various data domains and be able to translate them through data transformations to suit various business needs Oversee automated data infrastructure: Collaborate with software engineering and product teams to streamline data tracking in our products Ability to integrate data from disparate sources via cross domain data stitch into existing data model Implement data governance, lineage tracking, testing, and monitoring frameworks to guarantee data integrity Hands-on data optimization and query performance Liaise with key company teams (DBA, DevOps, SecOps…) for data accessibility and analysis Mentor and manage engineers and analysts in the normal execution of their responsibilities. Successfully implement software development projects to specification and within scheduled timelines and budget parameters Leverage AWS DevOps and CI/CD best practices to automate the deployment, through terraform, and management of data pipelines and infrastructure. Basic Qualifications Bachelor's degree required from an accredited, not-for-profit, in-person college/university A track record of commitment to prior employers 6+ years of hands-on experience in software development, delivering high-quality solutions Strength in Data Engineering, with strong proficiency in Python, PySpark, and SQL Solid foundation in Object-Oriented Programming principles and best practices Demonstrated success in building and launching data-driven products operating at terabyte scale Proven record of designing and implementing Enterprise Level secure, and accurate Data platform Ability to translate technical requirements into robust architecture, data models, and ETL strategies Practical experience with cloud-based databases, including both relational and non-relational systems Knowledge of business intelligence software (i.e. Power BI or similar tools) Understanding of AI technologies and hands-on experience leveraging AI tooling in development (Claude Code, GitHub Copilot, Cursor, Gemini, Grok) Ability to retrieve, synthesize, and present critical data in structures that is immediately useful to answering specific ad-hoc questions Hands-on data experience on optimization, data quality checks, data accuracy and query performance improvement Preferred Qualifications Hands-on experience or familiarity with big data platforms such as Databricks or Snowflake Proficiency with cloud platforms, including AWS or Azure Experience working with NoSQL databases (e.g., DynamoDB) and object storage systems (e.g., Amazon S3, GCS, etc.) Practical knowledge of event streaming technologies, especially Kafka Experience leveraging AWS compute and container services for scalable solutions Familiarity with large language models (LLMs), prompt engineering, or agent-based architectures Great analytical and problem-solving skills, with the ability to tackle complex technical challenges Strong Ability to understand technical challenges and complex designs, and communicate into simple business ideas, or solutions with senior management/stakeholders What's In It For You? When you join CoStar Group, you’ll experience a collaborative and innovative culture working alongside the best and brightest to empower our people and customers to succeed. We offer you generous compensation and performance-based incentives. CoStar Group also invests in your professional and academic growth with internal training and tuition reimbursement. Our benefits package includes (but is not limited to): Comprehensive healthcare coverage: Medical / Vision / Dental / Prescription Drug Life, legal, and supplementary insurance Virtual and in person mental health counseling services for individuals and family Commuter and parking benefits 401(K) retirement plan with matching contributions Employee stock purchase plan Paid time off Tuition reimbursement On-site fitness center and/or reimbursed fitness center membership costs (location dependent), with yoga studio, Pelotons, personal training, group exercise classes Access to CoStar Group’s Diversity, Equity, & Inclusion Employee Resource Groups Complimentary gourmet coffee, tea, hot chocolate, fresh fruit, and other healthy snacks The final salary or hourly rate offered for this role will fall within the range set forth below based on a variety of factors, including but not limited to, geographic location, skills, and competencies. Base Compensation: $128,000-$190,000 Annually We welcome all qualified candidates who are currently eligible to work full-time in the United States to apply. However, please note that CoStar Group is not able to provide visa sponsorship for this position. #LI-AV1 #Apartments.com CoStar Group is an Equal Employment Opportunity Employer; we maintain a drug-free workplace and perform pre-employment substance abuse testing

Design and develop scalable software using C# and object-oriented principles while maintaining product architecture and mentoring developers. | Bachelor's degree and 6+ years of production development experience with C# .Net, with experience in unit, performance, and automation testing. | Senior Full-Stack Engineer - Apartments.com - Irvine, CA Job Description CoStar Group (NASDAQ: CSGP) is a leading global provider of commercial and residential real estate information, analytics, and online marketplaces. Included in the S&P 500 Index and the NASDAQ 100, CoStar Group is on a mission to digitize the world’s real estate, empowering all people to discover properties, insights and connections that improve their businesses and lives. We have been living and breathing the world of real estate information and online marketplaces for over 35 years, giving us the perspective to create truly unique and valuable offerings to our customers. We’ve continually refined, transformed and perfected our approach to our business, creating a language that has become standard in our industry, for our customers, and even our competitors. We continue that effort today and are always working to improve and drive innovation. This is how we deliver for our customers, our employees, and investors. By equipping the brightest minds with the best resources available, we provide an invaluable edge in real estate. Apartments.com is the nation’s #1 rental marketplace for owners, property managers and consumers. Apartments.com is the network that millions of renters every year rely on to find their new place, is continuing to grow our industry-leading sales force. We provide apartment Property Managers and Owners with a platform to market their property listings and the industry’s most comprehensive virtual tools to attract the most and highest-quality renters. The Apartments.com Network includes Apartments.com, ForRent.com, ApartmentFinder.com, ApartmentHomeLiving.com, and eight other leading rental sites. Our suite of services includes digital advertising, social and reputation management, and market analytic solutions which delivers innovative tools for our customers. Learn more about Apartments.com. Our team is seeking an accomplished Senior Software Engineer to join our team in supporting multiple software products and brands across the organization. You will have a direct impact on highly visible Apartments.com web applications that touch millions of users. You continuously learn emerging technologies and architecture advancements and apply the learnings to improve Apartments’ software products This position is located in Irvine, CA and offers 4 days a week onsite with 1 day work from home. RESPONSIBILITIES Design and develop using Object Oriented design principles and software design patterns to attain high reusability and maintainability. Deep knowledge and experience in writing unit testable software with C# Develop an in-depth understanding of CoStar’s product architecture and frameworks. Maintain and contribute to CoStar’s product platform as necessary. Develop database stored procedures and SQL scripts/ETL jobs that meet CoStar database standards to implement product requirements. Participate and drive continuous improvement within CoStar’s Agile/Scrum teams. Build consensus among different teams working on software development projects. Facilitate discussions among other .NET and database developers to exchange new ideas and improvements. Continually evaluate emerging technologies to identify opportunities, trends and best practices that can be used to strengthen CoStar’s technology platform and development practices. BASIC QUALIFICATIONS Bachelor’s Degree required from an accredited, not-for-profit, in-person college/university A track record of commitment to prior employers 6+ years of production development experience with C# .Net (or .Net Core) A demonstrable track record of building and launching successful products and platforms Deliver products that meet specifications and performance SLA Experienced in unit, performance, and automation testing Deeply understand what drives the business for which you are building software Take an active role in mentoring developers with ability to build consensus PREFERRED QUALIFICATIONS Demonstrate working knowledge Vue, React or Angular in TypeScript Experience in relational database design (MS SQL or MySQL) including performance tuning Experience with AWS S3, SQS, Dynamo, ElastiCache, Apache Kafka and Datadog What’s in it for You When you join CoStar Group, you’ll experience a collaborative and innovative culture working alongside the best and brightest to empower our people and customers to succeed. We offer you generous compensation and performance-based incentives. CoStar Group also invests in your professional and academic growth with internal training, and tuition reimbursement. Our benefits package includes (but is not limited to): Comprehensive healthcare coverage: Medical / Vision / Dental / Prescription Drug Life, legal, and supplementary insurance Virtual and in person mental health counseling services for individuals and family Commuter and parking benefits 401(K) retirement plan with matching contributions Employee stock purchase plan Paid time off Tuition reimbursement On-site fitness center and/or reimbursed fitness center membership costs (location dependent), with yoga studio, Pelotons, personal training, group exercise classes Access to CoStar Group’s Diversity, Equity, & Inclusion Employee Resource Groups Complimentary gourmet coffee, tea, hot chocolate, fresh fruit, and other healthy snacks The final salary or hourly rate offered for this role will fall within the range set forth below based on a variety of factors, including but not limited to, geographic location, skills, and competencies. Base Compensation: $124,000-$187,000 Annually #LI-AV1 #Apartments.com CoStar Group is an Equal Employment Opportunity Employer; we maintain a drug-free workplace and perform pre-employment substance abuse testing

Provide technical leadership and architectural direction while managing engineering teams and driving project execution. | Bachelor's degree, 7+ years software engineering experience, 2+ years leadership, proficiency in full-stack cloud-native development. | Manager, Software Engineering Job Description Overview CoStar Group (NASDAQ: CSGP) is a leading global provider of commercial and residential real estate information, analytics, and online marketplaces. Included in the S&P 500 Index, CoStar Group is on a mission to digitize the world’s real estate, empowering all people to discover properties, insights and connections that improve their businesses and lives. We have been living and breathing the world of real estate information and online marketplaces for over 35 years, giving us the perspective to create truly unique and valuable offerings to our customers. We’ve continually refined, transformed and perfected our approach to our business, creating a language that has become standard in our industry, for our customers, and even our competitors. We continue that effort today and are always working to improve and drive innovation. This is how we deliver for our customers, our employees, and investors. By equipping the brightest minds with the best resources available, we provide an invaluable edge in real estate. As a Technical Manager in Software Engineering, you will be responsible for providing project definition and implementation through hands-on management of software development teams leveraging Agile Scrum development and project management best practices defined by the company. You will undertake the execution of software development projects to achieve the company’s strategic objectives and must work closely with Product Leaders & other managers. CoStar is investing heavily in artificial intelligence to accelerate software delivery, improve platform observability, automate research and business workflows, enhance product experiences through intelligent agents and skills, and improve data quality across enterprise systems. Successful candidates will demonstrate a willingness to learn, adopt, and apply AI technologies responsibly to solve complex business and engineering challenges. This position is located in Richmond, VA and offers a schedule of Monday to Thursday in office and the option to work from home on Friday. Responsibilities Provide technical leadership, architectural direction, and delivery ownership for a portfolio of software products and platforms. Lead and mentor high-performing teams of software engineers building scalable applications and services using TypeScript, React, Node.js, .NET, SQL Server, AWS, and AI technologies. Serve as a player-coach by guiding technical design, reviewing code, removing delivery obstacles, and contributing to key engineering initiatives. Drive execution across multiple projects, coordinating priorities, dependencies, and resources within engineering and across business functions. Champion AI-assisted software development practices that improve developer productivity, code quality, platform reliability, and engineering efficiency. Leverage AI-powered observability, monitoring, anomaly detection, replayability, and automation capabilities to improve system resiliency, incident response, and customer experience. Partner with Product, Engineering, and business stakeholders to identify and implement intelligent solutions that streamline workflows, reduce manual effort, and accelerate business outcomes. Lead the design, development, and governance of AI-powered solutions, including agents, tools, skills, copilots, and workflow automations that enhance internal operations and customer-facing products. Establish and enforce engineering best practices related to software quality, security, scalability, observability, and operational excellence. Promote responsible AI adoption by ensuring solutions meet established security, privacy, compliance, governance, and quality standards. Apply modern quality management practices to deliver reliable, maintainable, and defect-resistant software solutions. Represent the voice of the customer during product planning, design reviews, and release readiness processes to ensure solutions meet customer expectations. Basic Qualifications Bachelor’s degree in Computer Science, Software Engineering, Information Systems, or a related technical field from an accredited, not for profit, in-person university or college. Track record of commitment to prior employers. 7+ years of professional software engineering experience, including full-stack application development. 2+ years of engineering leadership experience managing software development teams. Proven experience delivering and scaling successful software products throughout the software development lifecycle. Hands-on experience with TypeScript, C#, .NET, React, SQL Server, Elasticsearch, AWS, and modern cloud-native development practices. Strong understanding of software architecture, distributed systems, API design, and scalable application development. Experience evaluating, adopting, or developing AI-powered solutions and applications. Familiarity with large language models (LLMs), agent frameworks, AI orchestration tools, and AI-assisted development platforms. Understanding of observability, monitoring, telemetry analysis, replayability, automated incident detection, and operational intelligence platforms. Strong written and verbal communication skills with the ability to effectively engage engineers, business stakeholders, and senior leadership. Demonstrated ability to recruit, mentor, develop, and inspire high-performing engineering teams. Preferred Qualifications Experience leading engineering teams through the full software development lifecycle, from strategy and architecture through deployment and ongoing operations. Experience building modern web applications using React and related JavaScript/TypeScript frameworks. Experience developing, deploying, or managing AI-powered applications, copilots, agents, intelligent search experiences, or workflow automation platforms. Experience leveraging AI technologies to improve engineering productivity, software quality, operational monitoring, research workflows, or data stewardship initiatives. Experience implementing AI-enabled data quality solutions, including enrichment, deduplication, classification, entity resolution, anomaly detection, and governance. Experience operating large-scale cloud-native applications in AWS environments. Experience with modern observability platforms and site reliability engineering (SRE) practices. Experience leading teams in highly agile, fast-paced, product-driven environments. Advanced degree in Computer Science, Engineering, or a related technical discipline. What’s in it for you? When you join CoStar Group, you’ll experience a collaborative and innovative culture working alongside the best and brightest to empower our people and customers to succeed. We offer you generous compensation and performance-based incentives. CoStar Group also invests in your professional and academic growth with internal training and tuition reimbursement. Our benefits package includes (but is not limited to): Comprehensive healthcare coverage: Medical / Vision / Dental / Prescription Drug Life, legal, and supplementary insurance Virtual and in person mental health counseling services for individuals and family Commuter and parking benefits 401(K) retirement plan with matching contributions Employee stock purchase plan Paid time off Tuition reimbursement On-site fitness center and/or reimbursed fitness center membership costs (location dependent), with yoga studio, Pelotons, personal training, group exercise classes Access to CoStar Group’s Employee Resource Groups Complimentary gourmet coffee, tea, hot chocolate, fresh fruit, and other healthy snacks The final salary or hourly rate offered for this role will fall within the range set forth below based on a variety of factors, including but not limited to, geographic location, skills, and competencies. Base Compensation: $182,000 - $235,000 Annually We welcome all qualified candidates who are currently eligible to work full-time in the United States to apply. However, please note that CoStar Group is not able to provide visa sponsorship for this position. #LI-KW1 CoStar Group is an Equal Employment Opportunity Employer; we maintain a drug-free workplace and perform pre-employment substance abuse testing