Senior Fullstack Developer .NET + React
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
• 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 Scrum
Requirements
• 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 B2
Nice to have
• Financial services / banking experience
• Mobile application views
• Automated testing
• Postman
• Playwright
• WCAG
Benefits
• 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
Frequently Asked Questions
Is the salary disclosed for the Senior Fullstack Developer .NET + React position at madiffpl?
The salary for this Senior Fullstack Developer .NET + React role at madiffpl is not publicly listed. Click "Apply Now" to learn more about the compensation package on their official careers page.
Where is the Senior Fullstack Developer .NET + React position at madiffpl located?
This Senior Fullstack Developer .NET + React role at madiffpl is based in Warsaw, Poland. The position is listed as on-site or hybrid. Check the full job description or apply directly to confirm the work arrangement.
Is the Senior Fullstack Developer .NET + React role at madiffpl full-time or part-time?
This is listed as a Full time position. It is posted as a Senior Fullstack Developer .NET + React role at madiffpl.
How do I apply for the Senior Fullstack Developer .NET + React position at madiffpl?
Click the "Apply Now" button on this page. You will be redirected to madiffpl's official application portal hosted on zohorecruit where you can submit your application directly.
When was the Senior Fullstack Developer .NET + React job at madiffpl posted?
This Senior Fullstack Developer .NET + React position at madiffpl was posted on Sep 30, 2026. Apply as soon as possible — early applications are often reviewed first.
Senior Fullstack Developer .NET + React
madiffpl
You'll be redirected to madiffpl's official application page on zohorecruit.