Backend Engineer - Cards

Senior Backend Engineer - Cards at SumUp in Sofia, Bulgaria. **What you'll do** - Own end-to-end delivery of backend services for the Cards EU domain. - Contribute to the technical roadmap and architectural discussions for distributed systems. - Raise pull requests, conduct code reviews, and maintain code quality standards. - Collaborate with adjacent squads and product managers to refine the backlog. - Participate in incident reviews, on-call rotation, and champion AI tooling. **What they're looking for** - Solid experience delivering production-ready backend services on a cloud-native stack. - Production experience with Kotlin and openness to Elixir, Java, or Golang. - Solid understanding of distributed systems, API design, and relational databases. - Hands-on experience with containerization, orchestration, and CI/CD. - Ability to lead technical approaches for ambiguous product problems. **Details** - Location: Sofia, Bulgaria - Type: Full-time