Sr C# Developer (Migration)

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.