Senior Back-end Developer C# .NET - Freelance
Cafeyn
full-remoteseniorfreelancebackend Full remote - Paris, FR 11 days ago via WTTJ
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C#.NET CoreSQLREST APIsgRPCAPI DevelopmentBack-end DevelopmentCode ReviewTechnical DesignTechnology Watch
About the role
Role Overview
Senior Back-end Developer (C# / .NET) on a freelance basis with Cafeyn. You will work within the Tech team to build and maintain back-end services, with a focus on APIs and system design.
Responsibilities
- Develop APIs and other back-end components
- Ensure operation and maintenance of existing systems
- Participate in technical design of back-end systems
- Drive development phases end-to-end, including code review and documentation
- Stay up to date with emerging technologies and evaluate new technical solutions
Requirements
- Strong knowledge of C# and the .NET Core framework
- SQL experience
- Strong understanding of REST APIs and/or gRPC
Nice-to-haves
- Experience with API design and back-end architecture practices (implied by role focus)
Contract & Duration
- Freelance engagement until end of December 2026
Location / Remote
- Full remote (listed with Paris, FR)
About Cafeyn
Cafeyn is a digital reading service used by over 2 million users worldwide. It operates and evolves back-end systems that power its reading platform and related services.
Scraped 5/12/2026