.NET Developer (MID+/Senior)

Warsaw/Łódź based opportunity with remote work model (2 days in the office/month).

About the role:

As a .NET Developer you will be working for our client, a leading organization in the online banking sector that is transforming its IT landscape into a modern, scalable platform. You will join a technology-focused team supporting various banking products, helping to reduce technical debt and reshape legacy systems into future-ready solutions. This position offers the opportunity to work on complex architectures, collaborate with product teams and architects, and influence the modernization of critical applications in a dynamic environment that values innovation and problem-solving.

Main responsibilities:

• Develop and maintain backend solutions in .NET Core / .NET 6+

• Support the modernization of legacy systems into a modern platform

• Analyze and understand existing code

• Refactor applications and implement new design patterns

• Collaborate with product teams and solution architects

• Ensure adherence to best coding practices and design principles

• Contribute to reducing technical debt across systems

• Participate in technical discussions and propose improvements

Requirements:

• Minimum 4–5 years of experience in backend development with .NET (preferably .NET Core / .NET 6+)

• Very good knowledge of C#

• Experience working with complex, large-scale architectures

• Strong ability to analyze and refactor existing code

• Knowledge of design patterns and best coding practices

• Teamwork and communication skills for effective collaboration

Nice to have:

• Knowledge of WCF (Windows Communication Foundation)

• Experience with Kubernetes, containerization, and microservices

• Familiarity with technical debt management and legacy system modernization

• Experience in the financial sector or with banking systems

• Knowledge of CI/CD and DevOps tools

What we offer:

• Stable and long-term cooperation with very good conditions

• Access to attractive Medical Package

• Enhance your skills and develop your expertise in the financial industry

• Access to Multisport Program

• Work on the most strategic projects available in the market

• Access to Pluralsight

• Define your career roadmap and develop yourself by delivering strategic projects for different clients of ITDS over several years

• Flexible hours

• Participate in Social Events, training, and work in an international environment

Ref.: 7619