Sr C# Developer (Migration)

Posted Yesterday
Hiring Remotely in Columbus, OH, USA
In-Office or Remote
Senior level
Artificial Intelligence • Cloud • Information Technology • Consulting
The Role
Build and maintain C#/.NET services supporting a large-scale data migration and consolidated MySQL database. Responsibilities include rebuilding the data access layer, designing versioned REST APIs, optimizing queries and caching, writing automated tests, and supporting CI/CD and containerized microservices. The role requires strong independent communication and stakeholder translation skills. Java, migration experience, cloud platforms, Kong, GraphQL, and AI-assisted development are preferred tie-breakers.
Summary Generated by Built In

This is a remote position.

About the role

IL6 is C#-heavy. This is a C#-first role: the must-have is strong C# / .NET, and Java is a genuine plus that breaks ties, not a gate. Do not reject strong C# candidates for weak Java on this one. The developer will build and evolve C# services as part of Client's data migration and API work, including the data access layer and API surface pointed at the consolidated MySQL database.

What you will do

•      Build and maintain C# / .NET services in the IL6 codebase.

•      Contribute to the rebuilt data access layer and the new API design as 30 databases consolidate into one MySQL instance.

•      Design and implement REST APIs to stable contracts, including versioning and consumer segmentation (app, integration, reporting).

•      Tune data access for performance (EF Core or Dapper, query design, indexing, caching).

•      Write automated tests and support CI/CD.

Must have

•      Strong C# / .NET: 8+ years, deep with .NET Core / .NET 6+, ASP.NET Core Web APIs, dependency injection, async/await.

•      Data access depth: EF Core and/or Dapper, connection management, query performance, SQL (MySQL or SQL Server).

•      API design: REST contract design, versioning, pagination, error handling.

•      Microservices and CI/CD: service-to-service communication, containerization, pipelines.

•      Communication: works independently, gives direct feedback, translates for stakeholders.

Nice to have (tie-breakers)

•      Java exposure, enough to read and reason about Java services during the migration. Valued, not required.

•      Migration or modernization experience.

•      AI coding tool experience; interest in AI-assisted development.

•      Kong, Azure or AWS, GraphQL.



Skills Required

  • 8+ years of strong C#/.NET experience
  • Deep experience with .NET Core or .NET 6+, ASP.NET Core Web APIs, dependency injection, and async/await
  • Experience with EF Core and/or Dapper, connection management, query performance, and SQL
  • Experience with MySQL or SQL Server
  • REST API contract design, versioning, pagination, and error handling
  • Microservices and service-to-service communication experience
  • Containerization and CI/CD pipeline experience
  • Ability to work independently, provide direct feedback, and translate technical concepts for stakeholders
  • Java exposure sufficient to read and reason about Java services
  • Migration or modernization experience
  • AI coding tool experience or interest in AI-assisted development
  • Experience with Kong, Azure, AWS, or GraphQL
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The Company
HQ: Columbus, OH
885 Employees
Year Founded: 1997

What We Do

Everest Technologies is an enterprise IT services firm that helps organizations solve business problems and scale through technology. Its offerings include managed services, project solutions, staff augmentation, DevOps and automation, quality engineering, cloud enablement, application services, retail and supply-chain technology, and decision intelligence. The company combines domain expertise with software engineering and AI capabilities, serving enterprise clients globally from U.S. and Indian delivery centers.

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