We are looking for a Senior Fullstack Developer (.NET + React) to join a new project focused on developing modern solutions for the financial services sector. The role is approximately 70% backend and 30% frontend, involving C#/.NET, React 18+, T-SQL, microservices, DDD, Clean Code and SOLID. You will develop new functionalities, work with existing and legacy code, contribute to solution architecture, and collaborate with Developers, Testers, Analysts and the Product Owner in a Scrum environment. Responsibilities• Development in C# / .NET• Frontend development in React• Analysis and development of existing and legacy code• Solution architecture• Debugging, profiling and performance analysis• Development of new functionality• Work with TSQL and relational databases• Cooperation with Developers, Testers, Analysts and Product Owner• Work within ScrumRequirements• Minimum 5 years commercial .NET development• Minimum 3 years commercial React development• Strong C#• .NET Framework / .NET Standard / .NET Core / modern .NET• React 18+• TSQL• Debugging and profiling• Performance analysis• DDD• Clean Code• SOLID• Architectural patterns• Asynchronous communication• SQL Management Studio• Visual Studio• Fluent Polish• English minimum B2Nice to have• Financial services / banking experience• Mobile application views• Automated testing• Postman• Playwright• WCAGBenefits• Flexible hybrid work model (1 day/week on-site in Warsaw/Gdańsk)• Solid, competitive salary• Work in a multinational environment on international projects• Comprehensive healthcare• Long-term B2B contract with a stable project pipeline

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Senior Fullstack Developer .NET + React