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
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• Initial 12-month contract with a strong possibility of extension.

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.

• 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

• OAuth authentication and authorization

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.