. NET Developer

Role:. NET Developer

Location: Woodbridge, NJ Hybrid

Contract long term

W2 only

Our  client needs a hands-on C# developer to port an ASP.NET Web API (Framework 4.8/IIS) to .NET 8. This developer will focus on migrating code, achieving endpoint parity, and harden quality/performance.

Primary Responsibilities:

• Migrate APIs to .NET 8: Convert controllers/filters/handlers to ASP.NET Core.
• Package & API upgrades: Replace legacy dependencies, modernize, address breaking changes and security issues.
• Parity & validation: Implement automated contract/golden tests, schema/response parity checks, and backward-compatibility safeguards.
• Quality & performance: Add/upgrade unit/integration tests, tune hot paths, and run load/regression tests to meet agreed budgets.
• Operational readiness: Ensure health checks, readiness/startup behavior, structured logging and metrics are in place for Choreo.
• Collaboration & docs: Work closely with platform/Choreo SMEs; document changes and create concise runbooks.

Minimum Qualifications:

• 7+ years C#/.NET with production REST APIs.
• Proven .NET Framework → .NET 6+ migrations, including dependency/hosting changes and behavioral parity.
• Strong ASP.NET Web API and ASP.NET Core internals (middleware, routing, filters, model binding, configuration).
• Experience with Entity Framework (EF Core).
• Test-driven mindset: unit/integration, contract tests, and diagnostics-driven debugging.
• Git workflow proficiency; CI/CD experience.
• Comfortable reading legacy code and incrementally refactoring without breaking behavior.
• BS in Com Sci or related focus. (Must have bachelor degree)