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Mastercard Logo Mastercard · IT - Software Development

Senior Software Engineer - C# OR Java

Poland, Gdansk · Job Posted February 01, 2026
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Job Description

We’re looking for a Senior Software Engineer to join our Connectivity division - the team that ensures our platform integrates flawlessly with thousands of bank and financial institutions APIs. You’ll tackle reliability at scale, low latency, and regulatory complexity, working in a flat, collaborative team where engineers own features end‑to‑end.

Job Responsibility

  • Design, develop, and maintain APIs and integration modules connecting our platform to thousands of European banks and financial institutions
  • Collaborate with engineers and product stakeholders to define requirements, set acceptance criteria, and deliver solutions
  • Contribute to architecture by ensuring scalability, maintainability, and adherence to best practices
  • Maintain quality through code reviews, testing, and continuous improvement initiatives
  • Solve complex problems involving performance, distributed systems, and regulatory constraints

Requirements

  • Strong experience building backend services (preferably in .NET and Java)
  • Experience working in fast-paced, product-centric environments
  • Solid understanding of API design, distributed systems, cloud environments
  • Experience in establishing bank connections through PSD2 interfaces
  • Ability to write clean, maintainable, and testable code
  • Collaborative mindset and eagerness to work closely with product and engineering peers
  • Curiosity and drive to continuously improve systems, processes, and yourself

What we offer

  • Impact at scale
  • Small team, big responsibility
  • Cutting-edge fintech
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