Freelance Full‑stack Developer (.NET Core + React.js)

About the role

Leptes is looking for an experienced full‑stack developer to join its remote team on a long‑term freelance basis. You will work on modern web applications built with .NET Core, React and Next.js for EU clients.

Key responsibilities

• Design, develop and maintain .NET 6‑10 backend services and REST APIs.
• Build responsive user interfaces with React (Hooks, Redux) and TypeScript, and contribute to Next.js features such as SSR, App Router and authentication.
• Work with Entity Framework Core and SQL Server for schema design, query optimisation and performance tuning.
• Write clean, testable code, participate in code reviews and follow Git/CI‑CD best practices.
• Collaborate with project managers and designers, refine requirements, estimate tasks and deliver iteratively.

Required profile

• 4+ years of full‑stack development experience.
• Strong background in C#/.NET (including .NET 6‑10, EF Core, MVC).
• 2‑4 years building SPAs with React.js and at least 2 years using TypeScript.
• Proficiency in Azure services (DevOps, Entra, Blob Storage) and solid SQL Server skills.
• English communication level B2+ and residence in Turkey.

Required skills

• .NET Core, C#, EF Core.NET MVC
• React.js, Redux, TypeScript, Next.js
• Azure DevOps, Azure Entra, Azure Blob Storage
• SQL Server, T‑SQL, performance profiling
• xUnit, Jest, Docker, CI/CD pipelines
• Legacy front‑end (jQuery/AJAX) maintenance
• Security and GDPR awareness