Senior Software Engineer - Ruby on Rails (f/m/d)

PAIR Finance is building an AI-driven debt collection platform and is looking for a Senior Software Engineer to drive a well-defined scope around in-court and after-court collection processes. You will own features end-to-end from idea to production, build proofs of concept, develop and maintain core backend services and contribute to high-level architecture. The role works closely with product, uses AI tools such as Claude Code and requires learning the legal domain behind collections. Candidates need 5+ years of software engineering experience with strong Ruby on Rails backend skills, TDD and CI/CD experience, and solid English.