New offer - be the first one to apply!
April 8, 2026
Senior • Hybrid
120 - 140 USD
Warsaw, Poland
We’re looking for an experienced Full-Stack Developer to build and evolve business applications using C#/.NET on the backend and React on the frontend. You’ll work closely with a cross-functional team (QA, Analysts, Product Owner) in an Agile/Scrum environment, contributing to both new development and improvements to existing (including legacy) codebases.
Key responsibilities:
Develop software in C# based on functional and technical documentation
Build and maintain the frontend using React (18+)
Analyse and improve existing code, including legacy components
Contribute to solution design and architecture
Collaborate daily with developers, testers, analysts and the Product Owner in Scrum
Requirements:
5+ years of experience building applications with .NET / C#
3+ years of experience building applications with React
Strong knowledge of C# (.NET Framework, .NET Standard, .NET Core/.NET)
React experience with modern versions (React 18+)
Practical skills in debugging, profiling and performance analysis
Understanding of DDD, Clean Code, SOLID
Knowledge of architectural patterns and asynchronous communication
Good command of T-SQL and SQL Server Management Studio (SSMS)
Experience working with Visual Studio
Nice to have
Experience building views/UI for mobile applications
Background in projects for the financial sector
Test automation experience (e.g., Postman, Playwright)
Familiarity with WCAG accessibility standards