Senior .NET / C# Developer – Enterprise API & Platform Integration

Qualifications

Backend Development

• C#

• .NET Core / .NET 6/7/8

• ASP.NET Core Web API

• Entity Framework Core

• LINQ & Async Programming

API & Integration

• REST APIs

• Swagger / OpenAPI

• JSON/XML

• OAuth2 / OpenID Connect

• Webhooks & API Integrations

• Postman/API Testing

Database Technologies

• SQL Server

• PostgreSQL

• Query Optimization

• Stored Procedures

• Transaction Processing

Cloud & DevOps

• AWS and/or Azure

• Docker

• GitHub / GitHub Actions

• CI/CD Pipelines

• Logging & Monitoring

Preferred Skills

• Microservices Architecture

• Kafka / RabbitMQ / AWS SQS

• Kubernetes

• Redis Caching

• Financial or Retirement Domain Experience

• Payroll / HRIS / Benefits Integrations

• SaaS Platform Development

• Secure Enterprise Application Design

Functional Domain Experience Preferred

• Retirement Administration

• 401(k) / Pension Platforms

• Financial Services

• Insurance & Benefits Administration

• Payroll Systems

• HR Technology Platforms

Responsibilities

• Design and develop scalable backend applications using C#, .NET Core/.NET 8, and ASP.NET Core Web APIs

• Build and maintain RESTful APIs, middleware, and enterprise integrations

• Integrate with retirement, payroll, HR, financial, and benefits administration platforms

• Develop secure authentication and authorization frameworks using OAuth2, JWT, and OpenID Connect

• Implement asynchronous processing, event-driven workflows, and microservices architectures

• Design and optimize SQL Server/PostgreSQL databases and data access layers

• Participate in cloud deployments, CI/CD automation, monitoring, and production support

• Collaborate with product managers, architects, QA teams, DevOps engineers, and client integration teams