Senior Java Software Engineer – AI-Driven Modernisation (f/m/x)

Technologies we use

About the project

Your responsibilities

• Modernizing legacy systems using AI to analyze, refactor, and optimize existing codebases
• Implementing modern architecture patterns, including strangler fig and microservices migration approaches
• Delivering production-ready services with robust testing, clear documentation, and multi-instance deployment support
• Using AI tools throughout the SDLC to boost productivity and ensure faster delivery cycles
• Collaborating with cross-functional teams to ensure smooth service transition and ownership handover
• Demonstrating measurable improvements in performance, reliability, and API efficiency

Our requirements

• Minimum 7 years of professional experience in Java programming
• Experience with legacy system refactoring or service modernization projects
• Hands-on experience with AI-powered development tools (e.g., GitHub Copilot, Claude Code, or similar LLMs)
• Solid understanding of CI/CD, automated testing, and cloud-native architectures
• Ability to design scalable, secure, and maintainable software solutions
• Willingness to travel to Krakow for short business delegations as needed
• Excellent command of English, both written and spoken, enabling effective communication in an international environment
• Residing in Poland required

What we offer

• Great Place to Work since 2015 - it’s thanks to feedback from our workers that we get this special title and constantly implement new ideas
• Employment stability - revenue of PLN 2.1BN, no debts, since 2006 on the market
• We share the profit with Workers - over PLN 76M has already been allocated for this aim since 2022
• Attractive benefits package - private healthcare, benefits cafeteria platform, car discounts and more
• Comfortable workplace – class A offices or remote work
• Dozens of fascinating projects for prestigious brands from all over the world – you can change them thanks to Job Changer application
• PLN 1 000 000 per year for your ideas - with this amount, we support the passions and voluntary actions of our workers
• Investment in your growth – meetups, webinars, training platform and technology blog – you choose
• Fantastic atmosphere created by all Sii Power People