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September 22, 2026

Senior Full-Stack Developer (.NET + React)

Senior • On-site

140 - 165 PLN/yr

Warsaw, Poland

Quick Facts

  • Role split: ~70% backend, ~30% frontend
  • Tech focus: C#/.NET microservices + React
  • Methodology: Scrum

Description

You will develop software for a new microfactoring sales system in the financial sector. The architecture is based on microservices (BFF, product, and process services) plus a monolith of base services, without using cloud. You’ll implement the frontend layer with React, build backend services in C#, design new solutions, and evolve existing code (including legacy).

Responsibilities

  • Develop software in C# according to technical documentation
  • Implement the frontend layer using the React library
  • Design architecture for new solutions
  • Analyze and improve existing code, including legacy solutions
  • Collaborate closely with the delivery team within Scrum

Requirements

  • 5+ years of experience developing applications in the .NET ecosystem (C#, .NET Framework, .NET Standard, .NET Core, .NET 8/10)
  • 3+ years of experience building frontend applications with React (18+)
  • Practical knowledge of Domain-Driven Design
  • Practical knowledge of Clean Code and SOLID principles
  • Experience designing software architecture and asynchronous communication
  • Strong knowledge of T-SQL and SQL Server Management Studio
  • Proficiency with Visual Studio
  • Ability to debug, profile, and analyze application performance

Benefits

  • Work on building a new financial system using a microservices + monolith architecture
  • Scrum team collaboration with developers, analysts, testers, a Product Owner, and a Scrum Master
  • Technical interview only (no live coding)

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