25-3034 - API Developer (.NET Core 8/9) - Herndon, VA

API Developer (.NET Core 8/9)
Job ID#: 25-3034
Location: Herndon, VA (Onsite)
Who We Are:
Since our inception back in 2006, Navitas has grown to be an industry leader in the digital transformation space, and we’ve served as trusted advisors supporting our client base within the commercial, federal, and state and local markets.
What We Do:
At our very core, we’re a group of problem solvers providing our award-winning technology solutions to drive digital acceleration for our customers! With proven solutions, award-winning technologies, and a team of expert problem solvers, Navitas has consistently empowered customers to use technology as a competitive advantage and deliver cutting-edge transformative solutions.
What You’ll Do:
We are seeking an experienced API Developer (.NET Core 8/9) to join our development team to design, develop, and maintain robust, scalable microservices and APIs. This role will focus on building high-performance back-end services, supporting both web and mobile platforms, and ensuring smooth integration with internal and external systems. The API Developer will collaborate with cross-functional teams including product, DevOps, and front-end developers to deliver innovative solutions as part of the organization’s digital modernization initiatives.
Responsibilities will include but are not limited to:

• Microservices Development: Design and develop scalable microservices and RESTful API endpoints using .NET Core 8/9 and ASP.NET Core Web API.
• API Implementation: Build well-documented, versioned, secure API endpoints for easy integration with front-end and third-party applications.
• Background Jobs: Develop background workers and asynchronous processing tasks using Azure Service Bus or Azure Storage Queues.
• Message-Driven Architecture: Implement event-driven microservices with reliable inter-service communication.
• Security & Caching: Secure APIs with OAuth2.0, JWT, Azure AD, and implement caching strategies (e.g., Redis, in-memory caching) for enhanced performance.
• Performance Optimization: Continuously monitor, profile, and tune API and database performance to ensure high availability and scalability.
• Clean Code Practices: Write clean, modular, and testable code following SOLID principles and Clean Architecture.
• Collaboration: Work in an Agile/Scrum environment with developers, QA engineers, and product managers to deliver features iteratively.
• Documentation: Maintain comprehensive technical documentation for APIs, workflows, and architectural decisions.
• Troubleshooting: Diagnose and resolve API-related issues, using logging and monitoring tools to ensure system reliability.

What You’ll Need:

• Bachelor’s degree in Computer Science, Information Systems, or a related technical field.
• 5+ years of experience in .NET Core API and microservices development to include:
  • Strong proficiency with C# programming and ASP.NET Core Web API.
  • Solid understanding of Clean Architecture and Domain-Driven Design.
  • Deep knowledge of SOLID principles and design patterns.
  • Experience with SQL Server, Entity Framework Core, and Dapper for database access and optimization.
  • Hands-on experience integrating authentication and authorization mechanisms (OAuth2.0, JWT).
  • Strong experience with Git version control and Agile methodologies.
  • Ability to conduct performance profiling, load testing, and system optimization.
• Cloud & DevOps Skills:
  • Basic understanding of Microsoft Azure cloud services.
  • Experience with Docker containerization and familiarity with CI/CD pipelines.
• Testing & Quality Assurance:
  • Experience with xUnit, NUnit, or other testing frameworks, and Moq for unit testing and mocking.

Set Yourself Apart With:

• Hands-on experience with Azure Service Bus, Azure Storage Queues, and Azure Functions.
• Experience with Azure Application Insights, Datadog, or similar observability tools.
• Experience deploying and monitoring applications in cloud-native environments (Azure, Kubernetes, etc.).
• Familiarity with container orchestration and advanced CI/CD automation.
• Strong understanding of API security best practices (preventing injection, XSS, CSRF vulnerabilities).
• Experience with Postman, Swagger for API testing and documentation.