Senior Java Software Engineer – AI-Driven Modernisation

3 tygodni temu

Katowice śląskie, śląskie, Polska Sii Sp. z o.o. Pełny etat
Senior Java Software Engineer – AI-Driven ModernisationMiejsce pracy: KatowiceTechnologies we useExpected
  • Java
  • AI
  • LLM
  • GitHub Copilot
  • Claude Code
About the project

We’re building a next-generation technology team focused on modernising critical financial services through AI-first engineering. You’ll play a key role in transforming complex legacy systems into modern, scalable, and intelligent solutions. You’ll work hands-on with the latest AI tools to accelerate development, improve code quality, and deliver measurable impact across the organization.

Sii ensures that all employment-related decisions are made solely on the basis of qualifications and competencies. We are committed to equal treatment of all individuals, regardless of any protected characteristics, and promoting a diverse and inclusive work environment.

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
This is how we work on a project
  • Continuous Deployment
  • Continuous Integration
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
Recruitment stages
  • Send your CV
  • Talk to us about your expectations
  • Learn more about our projects and choose the best
  • Start your adventure with Sii
Sii Sp. z o.o.

Sii is the leading technology consulting, digital transformation, engineering, and business services vendor in Poland. We already employ more than 7 300 professionals and implement projects in a variety of industries for clients from many countries around the world. The Great Place to Work title, won 10 times in a row, proves that at Sii, we create a friendly work environment.

Sii ensures that all employment-related decisions are made solely on the basis of qualifications and competencies. We are committed to equal treatment of all individuals, regardless of any protected characteristics, and promoting a diverse and inclusive work environment.

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