Parafin

Design, build, and maintain ML platform infrastructure for model experimentation, training, evaluation, and inference. | 5+ years software engineering with ML platform/MLOps experience, strong Python, SQL, Spark, ML fundamentals, and cloud/data stack expertise. | About Us: At Parafin, we’re on a mission to grow small businesses. Small businesses are the backbone of our economy, but traditional banks often don’t have their backs. We build tech that makes it simple for small businesses to access the financial tools they need through the platforms they already sell on. We partner with companies like DoorDash, Amazon, Worldpay, and Mindbody to offer fast and flexible funding, spend management, and savings tools to their small business users via a simple integration. Parafin takes on all the complexity of capital markets, underwriting, servicing, compliance, and customer service for our partners. We’re a tight-knit team of innovators hailing from Stripe, Square, Plaid, Coinbase, Robinhood, CERN, and more — all united by a passion for building tools that help small businesses succeed. Parafin is backed by prominent venture capitalists including GIC, Notable Capital, Redpoint Ventures, Ribbit Capital, and Thrive Capital. Parafin is a Series C company, and we have raised more than $194M in equity and $340M in debt facilities. Join us in creating a future where every small business has the financial tools they need. About The Position We’re looking for a software engineer to join Parafin’s Infrastructure team and lead the evolution of our ML Platform. This role is critical to building reliable, scalable, and developer-friendly systems for model experimentation, training, evaluation, inference, and retraining that power underwriting and other ML-driven products for small businesses. As a Software Engineer, you’ll design, build, and maintain the core abstractions and platforms that let data scientists ship high-quality models to production—safely and quickly. You’ll partner closely with Data Science and Platform Engineering, own the ML platform end-to-end, and develop batch and real-time underwriting infrastructure. What You'll Do • Turn notebooks into software. Decompose data scientist training/inference notebooks into reusable, tested components (libraries, pipelines, templates) with clear interfaces and documentation. • Create developer-friendly ML abstractions. Build SDKs, CLIs, and templates that make it simple to define features, train/evaluate models, and deploy to batch or real-time targets with minimal boilerplate. • Build our real-time ML inference platform. Stand up and scale low-latency model serving. • Expand batch ML inference. Improve scheduling, parallelism, cost controls, observability, and failure/rollback for large-scale batch scoring and post-processing. • Own and expand the feature store. Design offline/online feature definitions, high read/write throughput, and consistent offline/online semantics. • Platform reliability and observability. Instrument training/inference for latency, throughput, accuracy, drift, data quality, and cost; build alerting and dashboards; drive incident response and postmortems. • Underwriting infrastructure partnership. Support production batch and real-time underwriting systems in collaboration with Data Science; collaborate on model interfaces, SLAs, safety checks, and product integrations. What We Are Looking For • 5+ years of software engineering experience, including experience on ML platform/MLOps systems (training, deployment, and/or feature pipelines). • Strong Python; solid software design and testing fundamentals. Proficiency with SQL; hands-on Spark/PySpark experience. • Knowledge of ML fundamentals—probability & statistics, supervised vs. unsupervised learning, bias/variance & regularization, feature engineering, model evaluation metrics, validation strategies, and production concerns like drift, stability, and monitoring. • Expertise with modern data/ML stacks—AWS, Databricks (workflows, lakehouse, MLflow/registry, Model Serving), and Airflow (or equivalent orchestration). • Experience building real-time systems (service design, caching, rate limiting, backpressure) and batch pipelines at scale. • Practical knowledge of feature-store concepts (offline/online stores, backfills, point-in-time correctness), model registries, experiment tracking, and evaluation frameworks. • Strong problem-solving skills and a proactive attitude toward ownership and platform health. • Excellent communication and collaboration skills, especially in cross-functional settings. Bonus Points • Databricks experience (MLflow, Model Serving). • Experience with feature stores (e.g., Tecton, Feast) and streaming (Kafka/Kinesis). • Experience with fintech, risk, or underwriting systems; familiarity with model safety checks, rejection/override flows, and auditability. • Background with A/B testing platforms, shadow/canary deployments, and automated rollback. • Experience with low-latency inference systems. What We Offer • Salary Range: $220k - $265k • Equity grant • Medical, dental & vision insurance • Work from home flexibility • Unlimited PTO • Commuter benefits • Free lunches • Paid parental leave • 401(k) • Employee assistance program If you require reasonable accommodation in completing this application, interviewing, completing any pre-employment testing, or otherwise participating in the employee selection process, please contact us.

Design and build scalable backend systems and money movement infrastructure for financial products. | 6+ years backend/platform experience and a bachelor's degree in a related field. | About Us: At Parafin, we’re on a mission to grow small businesses. Small businesses are the backbone of our economy, but traditional banks often don’t have their backs. We build tech that makes it simple for small businesses to access the financial tools they need through the platforms they already sell on. We partner with companies like DoorDash, Amazon, Worldpay, and Mindbody to offer fast and flexible funding, spend management, and savings tools to their small business users via a simple integration. Parafin takes on all the complexity of capital markets, underwriting, servicing, compliance, and customer service for our partners. We’re a tight-knit team of innovators hailing from Stripe, Square, Plaid, Coinbase, Robinhood, CERN, and more — all united by a passion for building tools that help small businesses succeed. Parafin is backed by prominent venture capitalists including GIC, Notable Capital, Redpoint Ventures, Ribbit Capital, and Thrive Capital. Parafin is a Series C company, and we have raised more than $194M in equity and $340M in debt facilities. Join us in creating a future where every small business has the financial tools they need. About the Position: We are looking for an experienced platform-focused software engineer to join our Merchant Platform team in San Francisco to help build a scalable platform that will help power the suite of Parafin’s financial offerings. The Merchant Platform team owns the money movement infrastructure that powers all of Parafin as well as the suite of product-agnostic tools that enable product teams to delight the customers. You will work with engineering and non-engineering stakeholders across the company to launch several new products and regularly experiment with our existing products to improve the end-user experience. You will own our core platform and help identify, prioritize, and execute on infrastructure opportunities to accelerate product development and maintain high levels of reliability. The ideal candidate will thrive in a fast-paced environment, demonstrating strong technical fundamentals, the ability to navigate ambiguity and take ownership of projects from inception to completion. What You’ll Be Doing: Design and build scalable systems that support our merchant-facing products and services. Develop features that enhance the merchant experience and drive engagement. Collaborate with cross-functional teams to deliver seamless product integrations. What We’re Searching For: 6+ years of experience building and operating production backend or platform systems. Bachelor's Degree or higher in Computer Science (or related field) You care deeply about building high-quality software and take immense pride in your craft. You are comfortable owning and driving the development of both product and platform initiatives from scratch. You take the initiative to identify commonalities between different problem statements and design appropriate abstractions accordingly. You have a strong grasp of engineering fundamentals. You have experience building and operating asynchronous systems or data pipelines in production environments. You are excited about working on a small team and helping us set the foundations for the company. What We Offer: Salary Range: $285k - $330k+ Equity grant Medical, dental & vision insurance Work from home flexibility Unlimited PTO Commuter benefits Free lunches Paid parental leave 401(k) Employee assistance program If you require reasonable accommodation in completing this application, interviewing, completing any pre-employment testing, or otherwise participating in the employee selection process, please contact us.

Lead technical delivery of complex partner integrations and improve core product platform through collaboration with multiple teams. | Over 5 years of software engineering experience building production-quality backend systems with strong communication skills in customer-facing environments. | About Us: At Parafin, we’re on a mission to grow small businesses. Small businesses are the backbone of our economy, but traditional banks often don’t have their backs. We build tech that makes it simple for small businesses to access the financial tools they need through the platforms they already sell on. We partner with companies like DoorDash, Amazon, Worldpay, and Mindbody to offer fast and flexible funding, spend management, and savings tools to their small business users via a simple integration. Parafin takes on all the complexity of capital markets, underwriting, servicing, compliance, and customer service for our partners. We’re a tight-knit team of innovators hailing from Stripe, Square, Plaid, Coinbase, Robinhood, CERN, and more — all united by a passion for building tools that help small businesses succeed. Parafin is backed by prominent venture capitalists including GIC, Notable Capital, Redpoint Ventures, Ribbit Capital, and Thrive Capital. Parafin is a Series C company, and we have raised more than $194M in equity and $340M in debt facilities. Join us in creating a future where every small business has the financial tools they need. About the Position Forward Deployed Engineers (FDEs) at Parafin are product-focused software engineers who operate at the intersection of partner delivery and core platform development. FDEs lead high-complexity, net-new integrations and partner-driven initiatives end-to-end, collaborating closely with Product, Platform, and Partner Engineering (our GTM-facing partner team). Although FDEs interface with strategic partners, their core output is internal: shipping scalable product and platform improvements that make partner integrations faster, safer, and easier to support over time. What You'll Be Doing Own technical delivery for complex partner launches (end-to-end). Act as the engineering lead across teams to scope, sequence, and drive new work needed to launch strategic partners and expand on existing partnerships Ship and contribute code to the core product. Scale new & existing features across platforms to drive partner (customer) growth and adoption Design new integration patterns, interfaces, and end-to-end systems Partner closely with Sales, GTM, Product, and engineering teams to align on scope, surface product gaps early, and reduce rework downstream Identify and remove friction in integrations and partner support through new features and improved tooling What We're Looking For 5+ years of software engineering experience, with a track record of shipping production-quality code Experience building end-to-end backend systems, with flexibility to work across the stack Excellent communication skills to work directly with technical and non-technical stakeholders Ability and desire to represent Parafin with external partners Strong problem-solving skills and ability to execute and drive progress in ambiguous environments Bonus Points: Prior founder or entrepreneurial experience. You have had extreme ownership and drive, possess a strong ability for customer-centric problem solving, and are bought into a high-growth mindset Experience working directly with enterprise or strategic customers. You have collaborated with business stakeholders and built trust while managing expectations across internal and external parties Previously built platforms and features for public use. Examples include Public APIs & demo sandbox environments. What We Offer: Salary Range: $230-265 Equity grant Medical, dental & vision insurance Work from home flexibility Unlimited PTO Commuter benefits Free lunches Paid parental leave 401(k) Employee assistance program If you require reasonable accommodation in completing this application, interviewing, completing any pre-employment testing, or otherwise participating in the employee selection process, please contact us.

Design and build scalable backend systems and collaborate cross-functionally to improve infrastructure and launch products. | 5+ years experience in backend or platform systems and a bachelor's degree. | About Us: At Parafin, we’re on a mission to grow small businesses. Small businesses are the backbone of our economy, but traditional banks often don’t have their backs. We build tech that makes it simple for small businesses to access the financial tools they need through the platforms they already sell on. We partner with companies like DoorDash, Amazon, Worldpay, and Mindbody to offer fast and flexible funding, spend management, and savings tools to their small business users via a simple integration. Parafin takes on all the complexity of capital markets, underwriting, servicing, compliance, and customer service for our partners. We’re a tight-knit team of innovators hailing from Stripe, Square, Plaid, Coinbase, Robinhood, CERN, and more — all united by a passion for building tools that help small businesses succeed. Parafin is backed by prominent venture capitalists including GIC, Notable Capital, Redpoint Ventures, Ribbit Capital, and Thrive Capital. Parafin is a Series C company, and we have raised more than $194M in equity and $340M in debt facilities. Join us in creating a future where every small business has the financial tools they need. About the Position: We are looking for an experienced platform-focused software engineer to join our Merchant Platform team in San Francisco to help build a scalable platform that will help power the suite of Parafin’s financial offerings. The Merchant Platform team owns the money movement infrastructure that powers all of Parafin as well as the suite of product-agnostic tools that enable product teams to delight the customers. You will work with engineering and non-engineering stakeholders across the company to launch several new products and regularly experiment with our existing products to improve the end-user experience. You will own our core platform and help identify, prioritize, and execute on infrastructure opportunities to accelerate product development and maintain high levels of reliability. The ideal candidate will thrive in a fast-paced environment, demonstrating strong technical fundamentals, the ability to navigate ambiguity and take ownership of projects from inception to completion. What You’ll Be Doing: Design and build scalable systems that support our merchant-facing products and services. Develop features that enhance the merchant experience and drive engagement. Collaborate with cross-functional teams to deliver seamless product integrations. What We’re Searching For: 5+ years of experience building and operating production backend or platform systems. Bachelor's Degree or higher in Computer Science (or related field) You care deeply about building high-quality software and take immense pride in your craft. You are comfortable owning and driving the development of both product and platform initiatives from scratch. You take the initiative to identify commonalities between different problem statements and design appropriate abstractions accordingly. You have a strong grasp of engineering fundamentals. You have experience building and operating asynchronous systems or data pipelines in production environments. You are excited about working on a small team and helping us set the foundations for the company. What We Offer: Salary Range: $230k-$265k Equity grant Medical, dental & vision insurance Work from home flexibility Unlimited PTO Commuter benefits Free lunches Paid parental leave 401(k) Employee assistance program If you require reasonable accommodation in completing this application, interviewing, completing any pre-employment testing, or otherwise participating in the employee selection process, please contact us.

Lead technical design and evolution of platforms and infrastructure powering lending products, mentor engineers, and drive cross-functional initiatives. | 8+ years backend engineering experience with strong cross-functional collaboration and leadership in platform or product environments. | About Us: At Parafin, we’re on a mission to grow small businesses. Small businesses are the backbone of our economy, but traditional banks often don’t have their backs. We build tech that makes it simple for small businesses to access the financial tools they need through the platforms they already sell on. We partner with companies like DoorDash, Amazon, Worldpay, and Mindbody to offer fast and flexible funding, spend management, and savings tools to their small business users via a simple integration. Parafin takes on all the complexity of capital markets, underwriting, servicing, compliance, and customer service for our partners. We’re a tight-knit team of innovators hailing from Stripe, Square, Plaid, Coinbase, Robinhood, CERN, and more — all united by a passion for building tools that help small businesses succeed. Parafin is backed by prominent venture capitalists including GIC, Notable Capital, Redpoint Ventures, Ribbit Capital, and Thrive Capital. Parafin is a Series C company, and we have raised more than $194M in equity and $340M in debt facilities. Join us in creating a future where every small business has the financial tools they need. About the Position We're looking for an experienced backend engineer to join our Lending Products team in San Francisco and lead the technical evolution of the platforms and infrastructure that power Parafin's lending products. The Lending Products team builds the core systems, frameworks, and tooling that engineers across Parafin rely on to build and iterate on financial products. You'll partner with engineering teams across the company to build the platform capabilities that enable us to ship new product verticals and features quickly and reliably. As a Staff engineer, you'll lead ambiguous, cross-functional initiatives from strategy through execution. You'll make architecture decisions that affect company-wide architecture, drive alignment across the teams that depend on your platforms, and raise the bar for engineering quality by mentoring engineers and improving team processes. What You’ll Be Doing: • Lead the technical design and evolution of the platforms, frameworks, and shared infrastructure that power all of Parafin's lending products. • Partner with engineers on teams that own specific lending verticals to understand their needs and build platform capabilities that enable them to move quickly. • Set technical direction through engineering design docs, architecture reviews, and design discussions, aligning the team on priorities and tradeoffs. • Identify, prioritize, and own infrastructure improvements that accelerate product development and maintain high levels of system reliability. • Raise the bar for engineering quality through mentoring, code review, and improving team processes and reliability practices. • Mentor other engineers, drive improvements to team processes and code quality, and foster a culture of craft and ownership. What We’re Searching For: • 8+ years of experience working in a backend engineering role, ideally in a platform or product-focused environment. • You care deeply about building high-quality software and take immense pride in your craft. • You have experience leading ambiguous, cross-functional projects and can make sound tradeoffs across reliability, scalability, developer experience, and time to value. • You take the initiative to identify commonalities between different problem statements and design appropriate abstractions. • You have strong cross-functional communication and collaboration skills, comfortable working across Engineering, Product, and Data Science teams. Bonus Points • Experience building internal platforms or frameworks that other engineering teams build on top of. • Experience in fintech, financial products, or embedded finance. • Experience designing systems with strong correctness and auditability requirements. What We Offer • Salary Range: $265k - $330k • Equity grant • Medical, dental & vision insurance • Work from home flexibility • Unlimited PTO • Commuter benefits • Free lunches • Paid parental leave • 401(k) • Employee assistance program If you require reasonable accommodation in completing this application, interviewing, completing any pre-employment testing, or otherwise participating in the employee selection process, please contact us.

Develop and own platform infrastructure and features for lending products, collaborating across teams and mentoring engineers. | 5+ years backend engineering experience, strong software quality focus, cross-functional collaboration, and platform development expertise. | About Us: At Parafin, we’re on a mission to grow small businesses. Small businesses are the backbone of our economy, but traditional banks often don’t have their backs. We build tech that makes it simple for small businesses to access the financial tools they need through the platforms they already sell on. We partner with companies like DoorDash, Amazon, Worldpay, and Mindbody to offer fast and flexible funding, spend management, and savings tools to their small business users via a simple integration. Parafin takes on all the complexity of capital markets, underwriting, servicing, compliance, and customer service for our partners. We’re a tight-knit team of innovators hailing from Stripe, Square, Plaid, Coinbase, Robinhood, CERN, and more — all united by a passion for building tools that help small businesses succeed. Parafin is backed by prominent venture capitalists including GIC, Notable Capital, Redpoint Ventures, Ribbit Capital, and Thrive Capital. Parafin is a Series C company, and we have raised more than $194M in equity and $340M in debt facilities. Join us in creating a future where every small business has the financial tools they need. About the Position We're looking for a user-focused backend engineer to join our Lending Products team in San Francisco to help build the platforms and infrastructure that power the suite of Parafin's lending products. The Lending Products team builds the core systems, frameworks, and tooling that product engineers across Parafin rely on to build and iterate on financial products. You'll partner with engineering teams across the company, including those that own offer generation, servicing, and repayment, to build and improve the platform capabilities they need to ship new product verticals quickly and reliably. As a Senior Software Engineer, you'll independently own and ship platform features end-to-end, contribute to the design of new platform capabilities, and play a key role in the team's growth. What You’ll Be Doing: • Own the development of key components of our lending platform infrastructure, including the systems and frameworks that product engineers use to build and ship lending products. • Partner with engineers on teams that own specific lending verticals to understand their needs and build platform capabilities that enable them to move quickly. • Identify, own, and implement improvements to our infrastructure to support product development and improve system reliability. • Contribute to a strong engineering culture through thoughtful code reviews, clear documentation, and knowledge sharing. • Mentor other engineers, drive improvements to team processes and code quality, and foster a culture of craft and ownership. What We’re Searching For: • 5+ years of experience working in a backend engineering role, ideally in a platform or product-focused environment. • You care deeply about building high-quality software and take pride in your work. • You are comfortable owning and driving the development of new platform capabilities from the ground up. • You have a solid understanding of engineering fundamentals and a desire to continue learning. • You have strong cross-functional communication and collaboration skills, comfortable working across Engineering, Product, and Data Science teams. • You are excited about working on a small team and playing a key role in our company's growth. Bonus Points • Experience building internal platforms or frameworks that other engineering teams build on top of. • Experience in fintech, financial products, or embedded finance. • Experience designing systems with strong correctness and auditability requirements. What We Offer • Salary Range: $230k - $265k • Equity grant • Medical, dental & vision insurance • Work from home flexibility • Unlimited PTO • Commuter benefits • Free lunches • Paid parental leave • 401(k) • Employee assistance program If you require reasonable accommodation in completing this application, interviewing, completing any pre-employment testing, or otherwise participating in the employee selection process, please contact us.

Lead design and evolution of partner platform infrastructure and asynchronous event-driven systems. | 8+ years backend experience, strong engineering fundamentals, leadership in cross-functional projects, and experience with asynchronous systems. | About Us: At Parafin, we’re on a mission to grow small businesses. Small businesses are the backbone of our economy, but traditional banks often don’t have their backs. We build tech that makes it simple for small businesses to access the financial tools they need through the platforms they already sell on. We partner with companies like DoorDash, Amazon, Worldpay, and Mindbody to offer fast and flexible funding, spend management, and savings tools to their small business users via a simple integration. Parafin takes on all the complexity of capital markets, underwriting, servicing, compliance, and customer service for our partners. We’re a tight-knit team of innovators hailing from Stripe, Square, Plaid, Coinbase, Robinhood, CERN, and more — all united by a passion for building tools that help small businesses succeed. Parafin is backed by prominent venture capitalists including GIC, Notable Capital, Redpoint Ventures, Ribbit Capital, and Thrive Capital. Parafin is a Series C company, and we have raised more than $194M in equity and $340M in debt facilities. Join us in creating a future where every small business has the financial tools they need. About the Position: We are looking for an experienced user-focused backend software engineer to join our Partner Platform team in San Francisco. In this Staff role, you will shape the technical direction of partner-facing experiences and deliver high-leverage systems that improve how partners build with Parafin. The Partner Platform team owns the foundational systems that power partner integrations at Parafin. We build and operate partner data ingestion pipelines, DAG-based processing systems, public APIs, durable webhook delivery infrastructure, sandbox environments, and partner-specific integrations. We collaborate across engineering and data teams to ensure partner data reliably powers underwriting, risk evaluation, and reporting workflows. Our roadmap includes major platform modernization efforts, including evolving our data architecture and strengthening the reliability and scalability of our asynchronous, event-driven systems. The ideal candidate thrives in a fast-paced environment, combines strong technical fundamentals with pragmatic judgment, and can lead ambiguous, cross-functional initiatives from strategy through execution. What You’ll Be Doing: • Lead the technical design and evolution of key components of our partner platform infrastructure, including partner data ingestion and sharing systems, public APIs, and durable webhook delivery systems. • Drive end-to-end initiatives that improve the partner journey, from developer tooling and dashboards to the underlying platform systems that power ingestion, APIs, and real-time partner updates. • Set direction through technical vision, RFCs, and architecture reviews, aligning stakeholders across engineering, data, and product on priorities and tradeoffs. • Design and operate asynchronous, event-driven systems to reliably process partner data and deliver real-time updates to partner systems. • Raise the bar for engineering quality through mentoring, code review, and improving team processes, reliability practices, and on-call health. What We’re Searching For: • 8+ years of experience building and operating production backend or platform systems. • Bachelor's Degree or higher in Computer Science (or related field) • You care deeply about building high-quality software and take immense pride in your craft. • You have experience leading ambiguous, cross-functional projects and can make sound tradeoffs across reliability, scalability, developer experience, and time to value. • You are comfortable owning and driving the development of both product and platform initiatives from scratch. • You take the initiative to identify commonalities between different problem statements and design appropriate abstractions accordingly. • You have a strong grasp of engineering fundamentals. • You have experience building and operating asynchronous systems or data pipelines in production environments. • You are excited about working on a small team and helping us set the foundations for the company. What We Offer: • Salary Range: $265k - $330k • Equity grant • Medical, dental & vision insurance • Work from home flexibility • Unlimited PTO • Commuter benefits • Free lunches • Paid parental leave • 401(k) • Employee assistance program If you require reasonable accommodation in completing this application, interviewing, completing any pre-employment testing, or otherwise participating in the employee selection process, please contact us.