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Description SeatOS is on a mission to transform and digitize the ground & sea transportation industry. Part of Travelier Group, SeatOS is a fast-growing B2B start-up building the digital infrastructure that enables operators to modernize their operations, connect to global distribution, and scale their businesses. Scaling fast across markets such as Thailand, Indonesia and the Philippines; our platform powers millions of trips annually and processes 10s of millions in GMV. Now, we’re entering our next phase of growth. We’re looking for a skilled Full-Stack Developer who can build and maintain high-performance web applications using modern JavaScript frameworks. You’ll work across both frontend and backend systems — implementing scalable features, designing robust APIs, and ensuring seamless user experiences. Key Responsibilities Develop and maintain scalable web applications using React on the frontend and Node.js (Express/Nest.js) on the backend. Design and implement RESTful APIs and integrate third-party services. Write clean, maintainable, and testable code using modern best practices. Collaborate closely with designers, product managers, and other developers to deliver end-to-end solutions. Work with both relational and NoSQL databases (e.g., PostgreSQL/MySQL, MongoDB, Redis). Optimize performance, security, and scalability across all application layers. Participate in code reviews, technical discussions, and architectural design. Requirements 3+ years of professional experience as a Full-Stack Developer. Strong proficiency in: Frontend: React, Redux, Redux Toolkit, MUI (Material-UI). Backend: Node.js, Express.js, Nest.js. Solid understanding of RDBMS (PostgreSQL/MySQL) and NoSQL databases (MongoDB, Redis). Experience with API development, authentication, and microservice architecture. Strong knowledge of JavaScript (ES6+), TypeScript, and asynchronous programming. Familiarity with Git, CI/CD pipelines, and cloud environments (AWS, GCP, or Azure). Good communication skills and ability to work in an agile, collaborative environment. Nice to Have Experience with Docker or containerized deployments. Understanding of caching strategies and message queues. Experience with testing frameworks (Jest, Mocha, Cypress, etc.).