Full-Stack Software Engineer

About the RoleA fast-growing, seed-stage enterprise AI platform company based in Berlin is looking for a Full-Stack Software Engineer to join their small, high-impact engineering team. Founded in 2023, the company builds an all-in-one platform that enables organisations to securely adopt and integrate generative AI — including AI chat, workflows, and custom agents — across their entire operations. This is a full-time, on-site role in Berlin with substantial ownership from day one. You'll shape product features, drive architecture decisions, and ship quickly in a fast-paced early-stage environment. Visa sponsorship is available. What You'll Do• Design and implement robust backend systems and APIs powering a scalable AI platform. • Build end-to-end solutions spanning backend (Node.js), database layers, and frontend integration. • Develop and optimize database schemas, queries, and data models for performance and scalability. • Implement API endpoints and integrate with third-party services and AI/ML providers. • Collaborate with the team on technical architecture decisions and system design. • Maintain and optimize the codebase for performance, reliability, and maintainability. • Participate in rotating Support Engineer shifts, in which engineers periodically focus on supporting customers and the customer success team. What We're Looking ForRequired: • 3+ years of full-stack web development experience. • Strong proficiency with Node.js, React / Next.js, and TypeScript. • Solid command of PostgreSQL and SQL — data modeling, querying, and optimization. • Experience with Tailwind CSS for frontend styling and implementation. • Proven track record owning features end-to-end, from conception through production deployment. • Experience building AI-powered features or integrating AI/ML services into applications. • Experience designing robust APIs and integrating with third-party services and AI providers. • Strong CS fundamentals and communication skills acr