Senior Back End Developer

Location: Kraków, Hybrid 3days/office OR remoteEmployment type: permanent - UoP Salary: up 30000zł/month Senior Backend Engineer – Service Modernisation & AI Enablement You’ll join a small, senior team working hands-on to modernise critical backend services and improve delivery speed. The role is highly practical, focused on shipping production-ready solutions and using AI as an accelerator. What You’ll Do • Modernise legacy Java services using proven migration patterns • Analyse existing codebases, dependencies, and APIs, leveraging AI tools where helpful • Design and deliver scalable, reliable microservices with strong test coverage and documentation • Improve performance, reliability, and API responsiveness with measurable results • Build and enhance developer tooling, CI/CD pipelines, and automation (including AI-assisted workflows) • Collaborate closely with platform teams to ensure smooth handover and long-term ownership • Share best practices and mentor teams What You Bring • 8+ years of backend engineering experience, strong in Java and microservices • Proven experience modernising production systems at scale • Solid API design and distributed systems knowledge • Hands-on mindset: you write code, not just diagrams • Experience using modern AI developer tools (e.g. Copilot, LLM-based refactoring/testing tools) • Pragmatic, delivery-focused approach with strong collaboration skills If you enjoy building products end-to-end—from models to production—we’d love to hear from you.