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.

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.