Senior Fullstack Developer .NET + React

• Minimum 5 years of experience developing applications in .NET.
• Minimum 3 years of experience developing applications in React.
• Very good knowledge of C# and the .NET ecosystem including .NET Framework, .NET Standard, .NET Core, and .NET.
• Experience with React 18+.
• Strong debugging, profiling, and performance analysis skills.
• Knowledge of DDD, Clean Code, and SOLID principles.
• Understanding of architectural patterns and asynchronous communication.
• Good knowledge of T-SQL and SQL Server Management Studio.
• Experience working with Visual Studio.
• English language skills at B2 level or higher.
• Fluent in Polish.

Nice to have:

• Experience building views for mobile applications.
• Experience developing applications for the financial sector.
• Test automation experience using tools such as Postman and Playwright.
• Knowledge of WCAG accessibility standards.

• Develop software in C#/.NET based on technical and functional documentation.
• Implement frontend features in React.
• Analyse, maintain, and extend existing code, including legacy code.
• Contribute to solution architecture and technical design.
• Debug, profile, and analyse application performance.
• Collaborate closely with the delivery team: Testers, Analysts, and Product Owner.
• Work in Agile methodologies, especially Scrum.
• Ensure code quality, maintainability, and alignment with development best practices.