C# + Java Developer (digital payment)

Join an international technology team building next-generation open banking solutions used across Europe. Our platform enables secure, reliable, and high-quality connectivity to financial institutions—powering innovative products and services in the digital payments ecosystem.

You will work in a highly skilled, collaborative environment alongside teammates located mainly in Denmark, Ireland, and Romania.

As a .NET Developer, you will contribute to the development, improvement, and maintenance of a large-scale open banking platform. You will work on advanced API solutions focused on security, data processing, monitoring, onboarding automation, and high-performance connectivity.

This role is ideal for engineers who enjoy solving complex problems, working in modern cloud environments, and collaborating with international teams.

Our expectations:

• Strong experience in building backend services (Java + .Net).

• Approximately 6 years of relevant experience in C# programming.

• Solid knowledge in Java programming.

• 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.

• Experience working in fast-paced, product-centric environments.

• Collaborative mindset and eagerness to work closely with product and engineering peers.

• Proficiency in English, fluent Polish.

• Hybrid work 2-3 days per week (Gdansk).

• Proficiency in English, fluent Polish,

• Hybrid work 2-3 days per week (Warsaw or Gdansk).

Main responsibilities:

• Design, develop, and maintain APIs and integration modules connecting the 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.