June 2, 2026

Senior Fullstack .NET React Developer

Senior • Hybrid

20,160 - 21,840 PLN

Lodz, Poland

Unleash innovative web solutions — shape the future of digital banking experiences!

Łódź-based opportunity with hybrid work model (2 days in the office/month).

As a Senior Fullstack .NET React Developer, you will be working for our client, a leading financial institution focused on delivering innovative digital banking solutions. You will join a strategic modernization initiative involving the redevelopment of a business process management platform. The project focuses on rebuilding legacy applications from .NET Framework to modern .NET technologies, migrating infrastructure from on-premises environments to Kubernetes, and implementing high-quality engineering practices. You will collaborate closely with AI-powered development tools, contribute to system design decisions, and help deliver scalable, secure, and maintainable solutions in a complex enterprise environment.

Your main responsibilities:

  • Develop and maintain backend services using .NET and C#
  • Rebuild legacy applications from .NET Framework to modern .NET architecture
  • Design and implement frontend components using React
  • Create and maintain automated unit and regression tests
  • Collaborate with business stakeholders to analyze and refine requirements
  • Design scalable and maintainable software solutions
  • Integrate applications with databases and external services
  • Utilize LLM-based tools such as Claude and Codex to support software development activities
  • Participate in code reviews and ensure adherence to development standards
  • Deploy and support applications running in Kubernetes environments
  • Work closely with cross-functional teams in an Agile delivery model

You're ideal for this role if you have:

  • At least 5 years of experience in software development using C# and .NET
  • Experience with .NET Framework and modernizing legacy code
  • Good knowledge of React 
  • Practical experience working with LLM tools such as Claude and Codex
  • Strong experience with automated testing
  • Hands on experience with Docker and Kubernetes 
  • Experience designing and implementing enterprise applications
  • Strong knowledge of MS SQL
  • Experience using Git, JIRA, and TeamCity
  • Ability to work independently while collaborating effectively within a team
  • English skills sufficient to write and understand technical documentation

Nice to have:

  • Knowledge of message brokers, especially RabbitMQ, 

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