Senior .NET Full Stack Developer – API Integration

Title: Senior .NET Full Stack Developer – API Integration

Job Type: Contract – 2 to 3 Months |  Location: Philadelphia, PA / Hybrid or Remote

Job Description

Tri-Force Consulting Services is seeking a Senior Full Stack .NET Developer / API Integration Developer to support

backend application development, REST API development, business logic and integration with enterprise systems.​

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The successful candidate will work closely with backend, mobile, QA and cloud engineers in an Agile environment.

Responsibilities

• Develop backend services using C# and ASP.NET Core.

• Design and develop RESTful APIs.

• Build JSON/OpenAPI-based API contracts.

• Implement application business logic and workflows.

• Develop integrations with external and enterprise systems.

• Implement data access and database functionality.

• Work with PostgreSQL and SQL databases.

• Implement authentication and authorization.

• Develop validation, error handling, logging and retry mechanisms.

• Support mobile application API integration.

• Write unit and integration tests.

• Participate in peer code reviews.

• Troubleshoot production and integration issues.

• Support Azure deployment and CI/CD processes.

Required Skills

• 5+ years of software development experience.

• Strong C# and ASP.NET Core/.NET.

• Strong REST API development.

• JSON / OpenAPI / Swagger.

• SQL.

• PostgreSQL or equivalent relational database.

• Enterprise/API integration experience.

• OAuth 2.0 / JWT or equivalent authentication technologies.

• Unit and integration testing.

• Git.

• Agile/Scrum development.

Preferred Skills

• Microsoft Azure.

• Azure API Management.

• Azure App Service.

• Azure DevOps.

• OAuth 2.0 / OpenID Connect.

• Microservices.

• Third-party API integrations.

• GIS/location/address APIs.

• Mobile application backend development.

• Government/public-sector systems.