Modernize Complex Banking Systems as a .NET Developer!Warsaw based opportunity with remote work model (only 2 days in the office/month).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.Your 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 You're ideal for this role if you have: Minimum 4–5 years of backend development experience in .NET (preferably .NET Core / .NET 6+) Strong knowledge of C# Experience working with complex system architectures Ability to analyze and refactor existing code Knowledge of design patterns and programming best practices Experience collaborating with cross-functional teams Understanding of technical debt and system modernization Familiarity with microservices and containerization concepts Good communication and teamwork skills Problem-solving mindset and adaptability to diverse technologies Nice to have: Knowledge of WCF (Windows Communication Foundation) Experience with Kubernetes (K8s)  Experience working in the financial sector or with banking systems Knowledge of CI/CD and DevOps tools We offer you:ITDS Business Consultants is involved in many various, innovative and professional IT projects for international companies in the financial industry in Europe. We offer an environment for professional, ambitious, and driven people. The offer includes:  Stable and long-term cooperation with very good conditions  Enhance your skills and develop your expertise in the financial industry Work on the most strategic projects available in the market Define your career roadmap and develop yourself in the best and fastest possible way by delivering strategic projects for different clients of ITDS over several years Participate in Social Events, training, and work in an international environment Access to attractive Medical Package Access to Multisport Program Access to Pluralsight #GETREADY to meet with us!We would like to meet you. If you are interested please apply and attach your CV in English or Polish, including a statement that you agree to our processing and storing of your personal data. You can always also apply by sending us an email at [email protected]