Senior Full Stack Engineer

About the Role

A fast-growing, self-funded AI SaaS company in Munich is looking for a Senior Full Stack Engineer to help scale an enterprise AI platform toward 1 million users. You'll join a small, product-focused engineering team building secure, scalable systems and intuitive UX that brings AI to the core of the SME sector. This is a high-ownership role where your architectural decisions will directly shape the product's trajectory.
What You'll Do

• Own the most complex architectural challenges across the platform - including multi-terabyte data synchronisation 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 synchronise 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 so new systems can be connected in 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

Required:

• 5+ years of professional experience with React and TypeScript (dealbreaker).
• 7+ years of overall professional software engineering experience.
• 2+ years of backend development experience (Node.js/Express or equivalent).
• Proficiency with containerisation and orchestration using Kubernetes and Docker.
• Hands-on experience with tRPC, PostgreSQL, and modern frontend tooling.
• Proven track record designing, scaling, and maintaining complex software architectures for high-growth products.
• Experience operating at scale: synchronising large datasets, handling high volumes of API/LLM calls, and building secure multi-tenant systems.
• Experience mentoring junior developers or leading a small development team.
• Ability to own the product roadmap, drive technical decisions aligned with product goals, and collaborate with product managers and designers.
• Excellent written and verbal communication skills in English.
• Authorised to work in Germany without company visa sponsorship.

Nice to Have:

• Familiarity with AI platforms or AI workflow tooling.

Compensation & Benefits

• Salary: €70,000 - €90,000 per year (depending on experience).
• High degree of autonomy and product ownership from day one.
• Work directly with a senior engineering team on a product with real, growing traction in the SME AI space.

Location

This is a hybrid role based in Munich, Germany. Candidates must be based in or willing to relocate to Munich. Visa sponsorship is not available.