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MADIFF Polska

Senior Fullstack Developer .NET + React

MADIFF Polska Warsaw, Masovian Voivodeship, Poland

IT Services and IT Consulting · 51-200 employees

Yesterday
react Senior (5-10 yrs) Full-time Contractor Poland
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About the role

You will develop new functionalities and maintain existing code for financial services solutions using C#/.NET and React. The role involves collaborating with a cross-functional team in a Scrum environment to contribute to solution architecture and performance optimization.

What they look for

C# .NET React T-SQL Microservices DDD Clean Code SOLID SQL Management Studio Visual Studio Debugging Performance analysis Architectural patterns Asynchronous communication Scrum

Requirements

Candidates must have at least 5 years of commercial .NET development experience and 3 years of commercial React experience. Proficiency in C#, T-SQL, DDD, and SOLID principles is required, along with B2 level English proficiency.

Benefits

Flexible hybrid work model Competitive salary Multinational environment Comprehensive healthcare Long-term B2B contract

Full description

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

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