Senior Backend Developer (Node.js)

The Opportunity

Join us as a Senior Backend Developer and help build the server‑side foundation for multiple green‑field products—from marketplace platforms to internal SaaS—while co‑building our in‑house AI‑native development system. You'll:

• Code smarter, ship faster with Claude Code, Vibe Coding, Cursor/Windsurf, and whatever ingenious tools you suggest.

• Design & build robust APIs, microservices, and server architectures in Node.js.

• Develop our AI‑native platform for developers - your feedback and features go straight into the product roadmap.

• Collaborate remotely with frontend developers, designers, PMs, and engineers across Poland and Saudi Arabia on several ventures at once.

• Own the backend lifecycle: architect, implement, optimize, monitor, and scale.

• Champion best practices in API design, database optimization, security, and DevOps automation.

Why You'll Love Working with Us

• AI at the Core - We're not just using AI; we're building AI tools that make developers 10× more productive - and you'll be a key contributor.

• Remote‑First Freedom - Work anywhere in Europe. Flexible hours and a supportive culture focused on outcomes, not clock‑watching.

• Startup Energy + Venture‑Studio Stability - Tackle new ideas every quarter with the backing of an established venture builder.

• Competitive B2B Compensation - 16 000 - 26 500 PLN / month (depending on experience) and learning budget.

• Continuous Growth - Access to conferences, AI workshops, and internal hackathons to keep your skills razor‑sharp.

• Friendly, Multicultural Team - Collaborate daily with passionate engineers and product folks who love clean code, good memes, and sharing knowledge.

You Might Be a Good Fit If You…

• Have deep experience building production, distributed, event driven, Node.js applications and RESTful APIs.

• Are fluent with databases (PostgreSQL, MongoDB, Redis), cloud platforms (AWS, GCP, Azure), and modern backend architectures (microservices, serverless, event‑driven systems).

• Have already experimented with Claude Code or other AI pair‑programming tools - and can't imagine coding without them.

• Master modern JavaScript/TypeScript, Docker, CI/CD pipelines, and monitoring/logging systems.

• Communicate confidently in English (Polish is a bonus - many teammates are Polish).

• Thrive in fast‑paced, ambiguous environments where you switch between projects and wear many hats.

• Believing in craftsmanship - automated testing, clean architecture, security best practices, and performance optimization are second nature.

• Understand scalability challenges and can design systems that handle growth from MVP to millions of users.

Additional Information

Rimthan Corporate Venture Builder launches and scales digital ventures across the Middle East. We're their dedicated Polish delivery powerhouse, bringing European engineering excellence to a global portfolio of disruptive products. Together, we combine startup agility with enterprise‑grade resources - so your code reaches real users fast.