Full-Stack Software Engineer

Full-Stack Software Engineer

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Concentrate provides one OpenAI-compatible API to access, route, and manage models across leading AI providers and open-source models through a single endpoint. We help teams save time, lower token spend, improve reliability, and avoid vendor lock-in.

Supported by top-tier VCs. This is a remote role with preference for SF based candidates.

The Role

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We’re looking for a Full-Stack Software Engineer who can own features end-to-end, from database schema design through production deployment.

You’ll work across our entire stack to build customer-facing products and internal tools, with significant autonomy and direct impact on the business.

What You’ll Do

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• Design and implement full-stack features using modern TypeScript across the frontend and backend
• Architect, build, and maintain robust RESTful APIs with proper authentication, validation, and error handling
• Maintain high engineering standards through comprehensive testing, including unit, integration, and end-to-end tests
• Containerize and deploy services using Docker and CI/CD pipelines
• Collaborate closely with the founding team on product direction, architecture, and technical strategy
• Contribute to scalable, maintainable system architecture in a fast-moving startup environment

Requirements

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• 2+ years of experience
• Strong proficiency with TypeScript and Node.js
• Experience building production-grade frontends with React; Next.js preferred
• Familiarity with modern frontend tooling, such as Tailwind and component libraries
• Backend development experience with frameworks like Fastify or similar
• Solid understanding of PostgreSQL, including schema design and query performance
• Familiarity with Docker, CI/CD workflows, and cloud deployment environments
• Experience implementing secure authentication flows, such as JWT or OAuth
• Strong testing...