Senior Software Engineer (m/w/d)

We are a young, growing technology company based in the Stuttgart region, building digital products with a strong focus on usability, performance, and clean architecture. We are looking for a Senior Full Stack Developer with a strong backend focus who has hands-on experience working with LLM agents and wants to help shape our product and engineering culture. We offer a young, motivated team with short decision-making paths; real ownership and influence on our product, AI features, and technical direction; fair compensation and a long-term perspective; and a modern hybrid work setup. Our office is in the Stuttgart region, with good accessibility, and the role is based in Kernen im Remstal (71394), with partial home office and hybrid remote work. The position is full-time and permanent. Benefits include company events, flexible working hours, flextime, a home office option, employee discounts, and discounts on company products and services. We value straightforward applications without unnecessary formalities and offer an environment without corporate bureaucracy or buzzword culture. - Several years of professional experience as a backend or backend-focused full stack developer - Hands-on experience working with LLM agents in real projects, ideally in production - Solid understanding of agent concepts such as tool calling, multi-step workflows, and the practical limits of LLMs - Strong skills in at least one modern backend language - Solid experience with relational databases and data modeling - Experience designing and building clean, well-documented APIs - Good understanding of testing strategies, version control, and CI/CD workflows - Working knowledge of web frontend development - Independent, structured, and responsible working style - Fluent in English - Are you currently located in Germany and legally authorized to work in Germany without requiring visa sponsorship now or in the future? - Please briefly describe a project where you worked with LLM agents and what challenges you solved. - Nice to have, but not required: experience with Elixir or a strong interest in learning it; experience with distributed or concurrent systems; experience evaluating and monitoring LLM-based features; container-based development and deployment workflows; interest in product development beyond ticket-based work; automotive industry affinity. - Design, build, and maintain backend services, APIs, and data models that power our products - Integrate LLM-based agents into our products and workflows, including orchestration, tool use, and structured outputs - Make agent-driven features reliable in production, with attention to error handling, latency, cost, and monitoring - Use AI agents effectively in day-to-day development to speed up and improve engineering work - Contribute to frontend work where needed to deliver complete features - Drive architecture and technology decisions, especially around backend design and AI features - Mentor colleagues and help establish good engineering practices, including code reviews, testing, and documentation - Work closely with product, frontend, and DevOps to ship features that solve real problems