Senior Software Engineer, Backend (Fraud)

Kogo poszukujemy? 5+ years building backend systems at scale with Python or Kotlin. Experience with distributed systems on AWS, Kubernetes and MySQL/PostgreSQL. Proficiency in SQL and data rich environments. Strong system design skills and track record delivering maintainable services. Familiarity with CI/CD and safe production deployments. Experience with observability and incident response; participation in on-call rotations. Strong written and verbal English communication. Czym będziesz się zajmować? Own and deliver quarterly team goals; lead engineers through ambiguity and drive execution. Design and implement backend services and APIs using Python or Kotlin within microservice and event-driven architecture. Build scalable fraud tooling and infrastructure in collaboration with Product, Compliance, Machine Learning and Fraud Ops. Improve system reliability and architecture; maintain high observability standards and participate in on-call rotation. Contribute to technical design, code quality and mentoring; represent team in cross-functional initiatives.