Das sind wir: Long story short: Healthcare. Reinvented. Our mission as a thriving start-up is to leverage health care through technology. The software that we create enables patients to have full transparency about their treatment and makes it possible for the clinics to operate and collaborate internally in a brand new way. Patient21's incredible international team of engineers is enjoying daily our tech ecosystem - Kotlin, Spring-Boot, React, TypeScript, RabbitMQ, AWS, Docker, Kubernetes - and we're now investing heavily in applied AI to push the boundaries of what our product can do. Getting out of your comfort zone and realizing your full potential sounds appealing? If yes, you're in the right place - join our experienced engineers and leaders! Wir bieten Dir: Exciting start-up atmosphere. Gone are the days in which you wait for approvals for months. Make our disruptive product even better. Change how healthcare functions. Work with state-of-the-art technology. No legacy code. No technological debt. All green fields. Your workplace—your choice. Office? Great! Home? Sure! Mars? Not sure about the Internet there, but why not. Flexible working hours. No downtime. High degree of autonomy. The team. Collaborative. Fun. True professionals. A real team. Remote work opportunity. Angebot: Aufgaben: Build and ship backend services as part of our microservice architecture, with AI agents and LLM-powered features as a core part of what you deliver Design and write MCP servers and tool interfaces that let agents reliably interact with our systems and APIs Develop agent harnesses, orchestration layers, and memory modules that give agents the context and state they need to act dependably Make deliberate design decisions about agent behavior Build evaluation frameworks and test harnesses to measure agent reliability, safety, and quality in a high-stakes healthcare context Integrate large language models into production with strong attention to latency, cost, and observability Raise the bar and drive technological innovations to keep us at the cutting edge Apply continuous integration and deployment principles Ensure code quality and maintainability by writing tests, doing code reviews, and refactoring Was erwartet Dich: Qualifikation: Was bringst Du mit: Proven track record of backend software development with Java/Kotlin and/or Python, minimum of 5 years Hands-on experience building LLM-powered applications, agents, or agentic workflows (tool use, function calling, multi-step orchestration) Familiarity with major LLM APIs and frameworks (eg Anthropic, OpenAI, or similar) and an understanding of how to design tooling, MCPs, and memory for agents Experience designing and running evals or test harnesses for non-deterministic systems Experience with Spring Framework and messaging brokers such as RabbitMQ Solid understanding of SQL databases and developing containerized applications Experience with Kubernetes and Terraform is a plus A pragmatic mindset for shipping reliable software - and reliable AI - in a regulated, high-stakes domain English working proficiency Klingt das spannend?