[Hiring] Senior Backend Engineer @Caspar Health

Role Description

Caspar Health is looking for a Senior Backend Engineer (all identities) to join our team in Berlin. It is an exciting time to work at Caspar because you will be the one designing how our patients will use the app in the future.

• You own the Product, not just the Ticket: You think in solutions, not tasks, and build backend architectures that solve real-world patient needs.
• You are an AI-Native Engineer: You’ve mastered LLMs and Multi-Agent setups as strategic tools to accelerate development and stay ahead of the curve.
• You bridge the Stack: You are a Backend expert who naturally understands Mobile constraints, ensuring seamless performance from the API to the device.

Your Challenges

• Architectural & Backend Engineering: You will design, build, and improve high-performance APIs and services that power the Caspar Health app, ensuring scalability, resilience, and operational excellence.
• AI Frontier: You will design, build, and improve LLM-powered workflows and contribute to developing a multi-agent environment to enhance engineering productivity and efficiency.
• Cross-Functional Collaboration: You will partner with Product, UX, DevOps, and Engineering teams to deliver robust solutions and contribute to technical discussions, architecture decisions, and engineering best practices.
• Raising the Bar: You will champion best practices in code quality and test automation (e.g., Cypress).

Qualifications

• You are an expert in Ruby on Rails and TypeScript, with a track record of running these stacks in high-stakes production environments.
• You have a robust understanding of PostgreSQL and are comfortable navigating AWS (Cognito), Docker, and Kubernetes.
• You have experience with end-to-end testing frameworks (like Cypress) and guide the team in implementing best practices for test coverage and code quality.
• You understand the mobile ecosystem. Experience with React Native will help you design backend architectures that harmonize perfectly with the frontend.
• You are a proponent of continuous delivery and highly experienced in Over-the-Air (OTA) updates, ensuring a seamless experience for our patients.
• You already use LLMs as a force multiplier in your daily coding and have a clear vision for how autonomous agents can transform software development.
• Driven by a proactive "can-do" attitude, you thrive on challenging the status quo to drive mutual growth.
• As a true team player, you bridge the gap between high-level tech and business value, translating complex concepts into clear, compelling narratives for non-technical stakeholders.

Benefits

• Remote-first with flexible working hours – office optional in Berlin-Mitte or up to 90 days a year outside of Germany.
• Monthly home office allowance and an additional meal subsidy.
• 30 vacation days per year.
• Budget for learning & development, conferences, and coaching – tailored to your potential and growth opportunities.
• High level of ownership and decision-making freedom – no micromanagement.
• Genuine collaboration – no silos, no egos.
• Access to all Caspar offerings for mental and physical well-being.
• Snacks, group sports sessions, a never-empty drinks fridge, and a healthy dose of humor.

Company Description

Caspar Health is a digital rehabilitation clinic with a vision to provide patients with access to the most effective rehabilitation treatment at any time, any place.

• Medical facilities use Caspar Health to conduct therapy measures online with their patients during their hospital stay and after discharge.
• The combination of learning technology with in-depth medical knowledge ensures that the therapy goal is achieved in a sustainable manner.
• The services are covered by numerous pension insurance companies in the areas of rehabilitation, prevention and aftercare.