Senior Software Engineer (m/f/d) at Credibur

At Credibur , we are building a debt management platform for non-bank lenders that must work reliably under real operational pressure. As our customer base and data volume grow, the hard problems are no longer features, but correctness, performance, and robustness. We are looking for an experienced backend-focused Software Engineer (m/f/d) who helps us stabilize and scale our core systems without unnecessary complexity. This role is about building practical, reliable solutions to real-world problems. Our hiring process includes a live coding session without AI assistance . Tasks Own backend robustness: Improve and maintain core backend components with a focus on correctness, performance, and long-term maintainability Solve complex business logic: Identify and fix edge cases caused by heterogeneous customer data and evolving requirements Improve database performance: Analyze and optimize slow queries, data access patterns, and schema decisions as data volume increases Build pragmatic so