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 RoleLong Term B2B ContractRate: 145- 150 pln/h +VATStart: 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.