Senior API Backend Engineer (.NET/C#)

Senior API Backend Engineer (.NET/C#)

• U.S. Citizenship is required due to industry requirements.
• No C2C, third-party candidates, or visa sponsorship will be considered.
• Candidates must currently reside in Northeast Ohio or the Columbus, Ohio area.
• Hybrid schedule with 2 days per week onsite.
• Initial 12-month contract with a strong possibility of extension.

Senior API Backend Engineer (.NET/C#)

We're partnering with an innovative technology company that's building the next generation of secure enterprise APIs used by AI-powered applications. This isn't a traditional .NET development role, and it isn't an AI prompt engineering position.

We're looking for a senior backend engineer who has designed and built enterprise-grade API layers where security, authentication, authorization, and data integrity are mission critical. You'll help develop APIs that safely power business-critical transactions at scale.

What You'll Be Working On as a Senior API Backend Engineer (.NET/C#)

• Design and develop enterprise API layers using SQL .NET/C#
• Build secure, scalable backend services supporting high-volume transactions
• Work with Azure API Management to build and secure APIs
• Design authentication and authorization using OAuth and modern identity standards
• Develop and optimize SQL Server database interactions
• Collaborate with senior engineers on modern API design and backend architecture

Required Experience for Senior API Backend Engineer (.NET/C#)

• Extensive backend development in .NET Framework
• Enterprise API development
• Azure API Management
• OAuth authentication and authorization
• Strong SQL Server development experience
• Experience designing secure, scalable API architectures

If you've built secure backend platforms where reliability, authentication, and API design matter more than flashy front-end work, I'd love to talk with you.

Send me a message or apply today to learn more.

Mark Krusinski, CPC

send resumes to:

[email protected]