{"schemaVersion":"jobsearcher.job.v1","id":"deaa569ba714857028dcd20c","url":"https://jobsearcher.com/jobs/deaa569ba714857028dcd20c","canonicalUrl":"https://jobsearcher.com/jobs/deaa569ba714857028dcd20c","title":"Senior API Backend Engineer (.NET/C#)","description":"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 transactionsWork with Azure API Management to build and secure APIsDesign authentication and authorization using OAuth and modern identity standardsDevelop and optimize SQL Server database interactionsCollaborate with senior engineers on modern API design and backend architectureRequired Experience for Senior API Backend Engineer (.NET/C#)Extensive backend development in .NET FrameworkEnterprise API developmentAzure API ManagementOAuth authentication and authorizationStrong SQL Server development experienceExperience designing secure, scalable API architecturesIf 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, CPCsend resumes to:mark@emeraldresourcegroup.com","company":"Emerald Resource Group","rawCompany":"emerald resource group","city":"Ohio","state":"OH","isRemote":false,"isActive":false,"createdAt":"2026-08-09T10:44:38.736Z","occupations":[{"code":"15-1252.00","title":"Software Developers","slug":"software-developers"},{"code":"15-1299.08","title":"Computer Systems Engineers/Architects","slug":"computer-systems-engineers-architects"},{"code":"15-1254.00","title":"Web Developers","slug":"web-developers"}],"industries":[{"code":"541511","title":"Custom Computer Programming Services","slug":"custom-computer-programming-services"},{"code":"541512","title":"Computer Systems Design Services","slug":"computer-systems-design-services"},{"code":"513210","title":"Software Publishers","slug":"software-publishers"}],"jobPosting":{"@context":"https://schema.org","@type":"JobPosting","title":"Senior API Backend Engineer (.NET/C#)","description":"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. 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