About this role
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
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Development in C# / .NET
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Frontend development in React
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Analysis and development of existing and legacy code
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Solution architecture
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Debugging, profiling and performance analysis
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Development of new functionality
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Work with TSQL and relational databases
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Cooperation with Developers, Testers, Analysts and Product Owner
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Work within Scrum
Requirements
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Minimum 5 years commercial .NET development
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Minimum 3 years commercial React development
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Strong C#
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.NET Framework / .NET Standard / .NET Core / modern .NET
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React 18+
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TSQL
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Debugging and profiling
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Performance analysis
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DDD
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Clean Code
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SOLID
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Architectural patterns
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Asynchronous communication
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SQL Management Studio
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Visual Studio
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Fluent Polish
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English minimum B2
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Nice to have
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Financial services / banking experience
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Mobile application views
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Automated testing
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Postman
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Playwright
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WCAG
Benefits
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Flexible hybrid work model (1 day/week on-site in Warsaw/Gdańsk)
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Solid, competitive salary
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Work in a multinational environment on international projects
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Comprehensive healthcare
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Long-term B2B contract with a stable project pipeline