Frontend / Full-stack Developer ( React and. NET/ C#)

We are looking for a senior full-stack developer with a strong emphasis on React and TypeScript in the frontend, alongside .NET/C# and SQL Server in the backend. The primary responsibility will be to assist in rewriting and modernizing our platform using new technologies.

What we offer:

• Full Remote Role

• Long Term B2B Contract

• Rate: 145- 150 pln/h +VAT

• Start: May 2026.

Main Responsibilities:

The developer will:

• Strengthen the focus on React and TypeScript as the primary and most critical skills, embedding a solid foundation in modern JavaScript.

• Leverage .NET/C# and SQL Server as supporting skills to carry out day-to-day tasks independently, without being primarily responsible for complex backend or database optimizations.

• Possess experience with legacy technologies (e.g., Classic ASP) for better understanding of existing logic, though this is not a requirement.

Key Requirements:

• Strong proficiency in React and TypeScript.

• Experience with .NET and C#.

• Knowledge of SQL Server.

• Solid foundation in modern JavaScript.

• Self-driven and capable of independent work.

• Minimum experience: Mid-level (5 years) or Senior (10 years).

Nice to Have:

• Familiarity with legacy technologies such as Classic ASP.

Other Details:

This position supports remote work and is tailored for developers looking to transition and modernize legacy platforms with a collaborative approach.