Rimthan is a Riyadh-based corporate venture builder driving Saudi Arabia’s digital transformation in line with Vision 2030. We launch and scale innovative digital ventures across the Middle East.Our Polish delivery hub is a key part of this journey - a dedicated engineering powerhouse combining European technical excellence with startup agility and enterprise-grade standards. Together, we build impactful products that reach real users, fast.If you’re a Senior Java Backend Developer who enjoys green-field challenges, architectural ownership, and shaping how teams build software, we’d love you to join us and co-create the server-side foundation of our next ventures, including our in-house AI-native development system.What you’ll do as a Senior Java Backend DeveloperCode smarter and ship faster with Claude Code, Cursor/Windsurf, and any ingenious tools you bring to the team.Design and build robust APIs, microservices, and server architectures in Java (Spring Boot / Spring Cloud).Develop our AI-native platform for developers, with your feedback and features feeding directly into the product roadmap.Collaborate remotely with frontend developers, designers, PMs, and engineers across Poland and Saudi Arabia on multiple ventures simultaneously.Own the backend lifecycle: architect, implement, optimize, monitor, and scale.Champion best practices in API design, database optimization, security, and DevOps automation.You might be a good fit if youHave 7+ years of professional experience building production, distributed, event-driven Java applications and RESTful APIs.Are proficient in Java, Spring Boot, Spring Cloud, and modern backend design patterns.Have solid knowledge of databases (PostgreSQL, MongoDB, Redis), cloud platforms (AWS, GCP, Azure), and backend architectures such as microservices, serverless, and event-driven systems.Are experienced with Docker, CI/CD pipelines, and monitoring/logging systems.Have already experimented with Claude Code or other AI pair-programming tools - and can’t imagine going back to coding without them.Node.js experience is a plus - familiarity with backend JavaScript/TypeScript ecosystems is welcome.Communicate confidently in English; Polish is a bonus, as many teammates are based in Poland.Thrive in fast-paced, ambiguous environments where switching contexts and wearing multiple hats is part of the fun.Believe in craftsmanship - automated testing, clean architecture, security best practices, and performance optimization come naturally to you.Understand scalability challenges and know how to design systems that grow smoothly from MVP to millions of users.Why You'll Love Working with UsAI 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.AI Tools Included - Claude Code on the highest plan, available for both work and personal use.Remote-First Freedom - Work full-time remotely from anywhere in Europe, with flexible hours and a 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 - depending on experience, plus a dedicated learning budget.Paid Time Off - 20 days of paid vacation per year for rest and recharging.Continuous Growth - Access 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.Ready to build the next generation of digital ventures with us? Apply now and let’s shape the future together.