(Senior) .NET Developer - Freelance
Remote · Poland
Job Summary
Senior .NET Developer - AI Native with React for a remote EU freelance assignment. Responsibilities center on delivering software with a strong .NET stack, building RESTful APIs using ASP.NET Core, and implementing frontend components with React and TypeScript. The role requires working with SQL databases, applying Clean Architecture and design patterns, and following testing practices. Experience integrating large language models (OpenAI, Claude, Gemini) into applications and using AI frameworks (Semantic Kernel, LangChain or similar) is expected. Proficiency with Git, Docker, and CI/CD pipelines, plus familiarity with cloud platforms (Google Cloud Platform or others) is required. Polish and English at C1 level are required for effective collaboration. The position is fully remote from Poland with a freelance B2B contract for 3 months starting mid July, with potential extension; CET-working hours.
Required Qualifications
- Strong proficiency in C# and .NET 8+
- Experience building RESTful APIs with ASP.NET Core
- Solid knowledge of React and TypeScript
- Experience with SQL databases (SQL Server/PostgreSQL)
- Understanding of Clean Architecture, design patterns, and testing practices
- Hands-on experience integrating LLMs (OpenAI, Claude, Gemini) into applications
- Experience with AI frameworks (e.g. Semantic Kernel, LangChain or similar)
- Proficiency with Git, Docker, and CI/CD pipelines
- Experience working with Google Cloud Platform and/or other cloud platforms
- Strong problem-solving skills and ability to work independently
- Good communication skills and experience collaborating in cross-functional teams
- Polish and English at C1 level
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