Senior Full Stack Engineer

ABOUT THE ROLE We are a bootstrapped AI platform and product studio based in Munich, Germany, serving a fast-growing base of SME customers. Our platform enables teams to connect data sources, build custom AI workflows, and deploy tailored AI assistants — without needing to be technical experts. We're now looking for a Senior Full Stack Engineer to help us scale our platform from its current user base toward 1 million users. You'll join a small, product-focused engineering team and take real ownership of complex architectural challenges — from multi-terabyte data synchronization to secure sandbox infrastructure and high-volume LLM processing pipelines. WHAT YOU'LL DO - Own the most complex architectural problems across the platform, including multi-terabyte data synchronization and secure sandbox infrastructure. - Architect, build, and ship high-quality full-stack features using React and TypeScript, with a focus on long-term scalability and UX. - Design and implement systems to synchronize and index terabytes of client data while enforcing fine-grained permissions. - Build infrastructure to process millions of LLM calls per month with high reliability and security. - Implement scalable, secure code sandbox solutions capable of spawning thousands of sandboxes per day. - Create base infrastructure and tooling for fast custom integrations, enabling new systems to be connected within hours. - Collaborate on technical roadmaps and align on architectural decisions with the broader engineering team. - Debug production incidents, identify root causes, and implement durable fixes to keep the platform stable. - Mentor junior engineers and raise the bar through constructive, thorough code reviews. - Continuously improve development processes, code quality standards, and overall team performance. WHAT WE'RE LOOKING FOR Must-haves: - 7+ years of professional software engineering experience. - Strong hands-on experience with React, TypeScript, and PostgreSQL (including relational data modeling and query performance optimization). - Experience with tRPC or an equivalent type-safe API communication framework. - Proven experience designing and implementing secure, multi-tenant sandbox environments. - Experience building systems to process millions of LLM/API calls per month with high reliability and security. - Familiarity with the broader stack: Docker, Kubernetes, and modern CI/CD tooling. - Willingness to work on-site in Munich, Germany (hybrid arrangement). Nice-to-haves: - Experience scaling complex software architectures for high-growth B2B products. - A strong product ownership mindset with genuine attention to end-user experience. - A passion for mentoring engineers and shaping engineering standards and processes. - Comfort with fast-paced, high-growth environments and rapid context switching. COMPENSATION & BENEFITS - Salary: €70,000 – €90,000 per year, depending on experience. - Work on a product with real user impact in the growing AI/SME space. - Small, collaborative team with significant scope for architectural influence. - Hybrid work arrangement based in Munich. Please note: Visa sponsorship is not available for this role. Candidates must already have the right to work in Germany. LOCATION This is a hybrid role based in Munich, Germany. Regular on-site presence in Munich is required.