Senior Backend Engineer - Integrations Squad (all identities)

We're looking for a (Senior) Backend Engineer (all identities) to join our team in Berlin. What makes this team especially compelling is that you'll be contributing in a regulated healthcare environment, working with interoperability standards like KIS, HL7, and FHIR and resolving Clinics Data Integration Problems.

Your Challenges

• Design, develop, and maintain backend services and APIs using Ruby on Rails and TypeScript
• Build and optimize data integration pipelines with external healthcare systems (e.g., Clinics, Hospitals, Laboratories)
• Implement and maintain KIS (Krankenhausinformationssystem) and HL7-based integrations, as well as other relevant interoperability standards
• Ensure secure and reliable data exchange across systems, adhering to German and EU healthcare data protection regulations (e.g., DSGVO/GDPR)
• Collaborate with cross-functional teams (Frontend, Product, DevOps, and Clinical Partners) to define and deliver technical solutions
• Write clean, maintainable, and well-tested code, ensuring scalability, testability, and maintainability across all deliverables
• Monitor, troubleshoot, and optimize system performance and infrastructure on AWS
• Contribute to architectural discussions and continuous improvements in development processes and technology choices

Do you have experience in TypeScript?, * 5+ years building and operating production systems with Ruby on Rails and TypeScript, with a strong focus on scalable, maintainable, high-quality code

• Deep expertise in SQL and PostgreSQL, including designing robust data models and performance-conscious queries
• Hands-on experience with healthcare interoperability and regulated environments: KIS, HL7, FHIR, and secure data exchange between heterogeneous systems (ideally within German healthcare)
• Proven ability to design and integrate secure APIs and integrations (RESTful, asynchronous/event-driven), applying data security best practices throughout
• Strong track record owning AWS infrastructure, deployment pipelines, and modern delivery practices including CI/CD and Infrastructure as Code (e.g., Terraform)
• Proactive, collaborative communicator with a hands-on, continuous-learning mindset, including experimenting with AI-driven approaches; English (C1) and German (C1) (written and spoken)

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., * 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 they're doing. #MakeAnImpact!
• Genuine collaboration - no silos, no egos. After all, we're 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, * We live diversity - it's not a marketing slogan, it's part of our everyday reality.
• Feedback isn't a tool - it's 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).

Our product, Caspar Health, is used in medical facilities and by patients, doctors, and therapists. Working with (sensitive) personal data (e.g. health data) is part of our daily routine. That's why we expect a strong commitment from our employees to protect personal data and to safeguard the rights of those affected as best as possible.