Senior Backend Engineer RoR (all identities)

What to Expect

Caspar Health is the digital rehabilitation clinic with the vision of giving every patient access to the most effective rehabilitation treatment anywhere at any time. We provide individual digital therapy combined with personal therapeutic care from healthcare professionals. This is your opportunity to help shape traditional healthcare concepts in the areas of prevention and rehabilitation so that people receive the best possible care during and after their clinic stay regardless of their location.

We are 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 are a fit for this role if

• 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: Youve 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

Forget ticket-punching. Were looking for someone to take ownership of our core ecosystem:

• 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: We dont just talk about AI; we build with it. 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)

Your Profile

• The Backend Core: You are an expert in Ruby on Rails and TypeScript with a track record of running these stacks in high-stakes production environments
• Infrastructure & Scale: You have a robust understanding of PostgreSQL and are comfortable navigating AWS (Cognito) Docker and Kubernetes
• Quality & Testing: 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
• The Mobile Bridge: You understand the mobile ecosystem. Experience with React Native will help you design backend architectures that harmonize perfectly with the frontend
• Modern Delivery: You are a proponent of continuous delivery and highly experienced in Over-the-Air (OTA) updates ensuring a seamless experience for our patients
• AI-Native Mindset: 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
• Collaborative Challenger & Communicator: You dont just execute; you elevate. 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

Why Caspar Health

• Remote-first with flexible working hours office optional in Berlin-Mitte or up to 90 days a year outside of Germany
• To match this we support you with a monthly home office allowance and an additional meal subsidy
• Plenty of time to recharge with 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. We hire experts who know what theyre doing. #MakeAnImpact!
• Genuine collaboration no silos no egos. After all were all working toward the same vision. #ValueFocus!
• Access to all Caspar offerings for mental and physical well-being #HealthyTogether!
• And yes all the snacks your heart desires group sports sessions a never-empty drinks fridge and a healthy dose of humor are included too.

What defines us as a team

• We live diversity its not a marketing slogan its part of our everyday reality.
• Feedback isnt a tool its part of our culture.
• We believe that technology only makes sense when it truly helps people.
• Our drive is purpose but our standard is professionalism.

Diversity and Inclusion:

At Caspar Health we strive to provide a friendly safe and welcoming environment for all Casparians* regardless of ethnic origin gender gender identity and expression sexual orientation limitations of any kind physical appearance social background age or religion (or lack thereof).

When you apply we purely focus on your experience and motivation. You decide what additional information you want to disclose (picture marital status religion gender nationality etc). We value and treat all applications equally.

We are looking forward to getting to know you!

Your Contact

Elisabeth Hegele; Talent Acquisition Specialist

Please submit your application online. We are also interested in knowing your earliest possible start date and your salary expectations. If you have further questions please reach out to . We will get in touch with you as soon as we can.

Our product CASPAR Health is used in the environment of medical institutions patients doctors and therapists. Working with (sensitive) personal data (e.g. health data) is part of our daily work. Therefore we require a high level of commitment to the protection of personal data from our employees in order to protect the rights of the data subjects as best as possible.

Note on data protection:

Please apply exclusively via our career site as this is the only way we can guarantee the protection of your data. You can find our privacy policy .