Senior .NET Developer – Federal IT, Onsite VA

Network Designs; Alexandria (VA); On-site; USD 120,000 - 160,000; Full time

Benefits offered by this job

Health benefits

401(k) retirement matching

Paid leave and holidays

Professional development

Job summary

Network Designs, Inc. (NDi) is seeking a Senior .NET Developer to design, develop, and support secure enterprise applications across the full stack. The role requires hands-on leadership and collaboration with analysts, architects, and DevOps.

You will work with C#, ASP.NET Core, Angular, SQL Server, and RESTful API development to deliver reliable, scalable solutions while mentoring junior developers. On-site work in Alexandria, VA is required.

Qualifications

• Bachelor's degree in CS or related field required or equivalent experience.
• Minimum 10 years' related work experience in .NET applications.
• Advanced proficiency with C#, .NET Core, and ASP.NET Core.
• Strong RESTful API, web services, and system integration experience.
• Hands-on with Angular/TypeScript and modern web apps.
• SQL Server development with performance tuning and design.
• Proficient in HTML/CSS/JavaScript/TypeScript and responsive design.
• Experience with DI, design patterns, and layered architectures.
• Familiar with EF/EF Core and data-access tech; Git/Azure DevOps use.
• Agile/Scrum experience; secure coding practices; strong communication.

Responsibilities

• Design, develop, test, deploy, and maintain enterprise apps with C#, ASP.NET Core, and .NET.
• Build scalable components supporting complex business and operations.
• Contribute to architecture and technical design; mentor juniors.
• Troubleshoot performance, security, and reliability issues across stack.
• Modernize legacy apps and migrate to current .NET technologies.
• Develop and secure RESTful APIs, services, and integrations.
• Collaborate with analysts, product owners, DevOps, and customers.

Skills

C#

ASP.NET Core

Angular

SQL Server

RESTful APIs

TypeScript

Git/Azure DevOps

Web security

Education

Bachelor's degree in Computer Science or related field

Tools

Entity Framework

Azure

Docker

Kubernetes

Job description

Network Designs, Inc. (NDi) is seeking a Senior .NET Developer to design, develop, and support secure enterprise applications across the full stack. The role requires hands-on leadership and collaboration with analysts, architects, and DevOps.

You will work with C#, ASP.NET Core, Angular, SQL Server, and RESTful API development to deliver reliable, scalable solutions while mentoring junior developers. On-site work in Alexandria, VA is required.