Senior Backend Engineer – Platform & Integrations

• Take technical ownership of the continued development of the backend and the product’s technical direction
• Make architectural decisions and ensure stable operations
• Develop a backend that scales with a growing number of customers, users, and devices
• Implement efficient database access, horizontal scaling, caching, and relevant load tests
• Develop retry mechanisms with exponential backoff and jitter, idempotency, timeouts, circuit breakers, and rate limiting
• Ensure fast response times and expand logging, metrics, and tracing
• Replace legacy data access patterns with clear REST endpoints and move business logic into the backend
• Help develop the integration platform for OpenID Connect, SAML, and SCIM
• Review code and AI agent outputs
• Support frontend and mobile teams with API design
• Set the backend direction and provide technical leadership

• Several years of professional experience in backend development with TypeScript/Node.js or Python for production SaaS products
• Strong experience with API design (REST, OpenAPI) and relational databases, ideally PostgreSQL
• Experience with systems operating under load, including retries, idempotency, timeouts, and backpressure
• Experience taking technical ownership of a product or system
• Proficient use of AI tools in development; able to understand, review, and take responsibility for generated code
• Willingness to learn new technologies
• Fluency in written and spoken German and English
• Nice to have: Fastify, Drizzle, Zod, and Python/FastAPI
• Nice to have: Circuit breakers, bulkheads, queues, and the Outbox pattern
• Nice to have: Multi-tenancy and Row-Level Security
• Nice to have: OIDC, OAuth 2.0, SAML, or SCIM
• Nice to have: Kubernetes, Argo CD, observability, and load testing
• Nice to have: Anonymized product analytics and A/B testing
• Nice to have: Basic knowledge of PKI and X.509

• Latest MacBooks or Windows Surfaces, also available for personal use
• Company credit card including expense management software
• Edenred City Card with €50 per month
• 30 days of annual leave
• Trust-based working hours
• Remote work options
• Modern offices in Münster and Cologne
• Professional certifications
• Leadership and soft-skills training
• Access to LinkedIn Learning and Udemy
• Meaningful work on projects with social impact
• High degree of ownership and room to shape your work
• Interdisciplinary team
• Technological excellence and an engineering-focused culture
• Involvement in strategic decisions and business development
• Short decision-making paths without corporate bureaucracy
• Opportunity to help shape customer relationships, business areas, and partnerships