Senior .Net Developer

About NDi

Network Designs, Inc. (NDi) is a leading Federal contractor that specializes in designing, developing, and delivering information technology and network solutions for government customers. Founded in 1985, NDi's firmly defined core values have driven all aspects of the business, which have been paramount to our company's success and the establishment of an enjoyable workplace atmosphere. At NDi, we believe that our people are the cornerstone of our success, and we value collaboration, career growth, and winning ideas.

Military Veterans Encouraged to Apply.

Network Designs, Inc. (NDi) is seeking an experienced Senior .NET Developer to design, develop, enhance, and support secure, scalable enterprise applications. This position is ideal for a hands‑on software engineer who can work across the full technology stack, translate complex business requirements into effective technical solutions, and provide technical leadership throughout the software development lifecycle.

The successful candidate will have extensive experience with C#, modern .NET technologies, ASP.NET Core, Angular, SQL Server, and RESTful API development
. This individual will work closely with business analysts, product owners, architects, quality assurance personnel, Dev Ops engineers, and other developers to deliver reliable, maintainable, and user-focused applications.

The Senior .NET Developer will also contribute to application architecture, technical design, code quality, performance optimization, security, and the mentoring of less-experienced developers.

• U.S. Citizenship is required
• Must be able to obtain a Public Trust clearance
• This position requires working onsite in Alexandria, VA, 5 days per week

• Bachelor's degree in Computer Science, Information Systems, Engineering, Software Development, or a related technical discipline. An equivalent combination of education, training, certifications, and relevant professional experience may be considered.
• At minimum 10 years' related work experience
• Advanced proficiency with C# and modern .NET technologies, including .NET Core, .NET 6 or newer, and ASP.NET Core.
• Strong experience designing and developing RESTful APIs, web services, and system integrations.
• Strong experience developing modern web applications using Angular and Type Script.
• Advanced Microsoft SQL Server development experience, including complex queries, stored procedures, database design, and performance tuning.
• Strong proficiency with HTML, CSS, JavaScript, Type Script, and responsive web-development techniques.
• Experience with object-oriented programming, dependency injection, design patterns, and layered or service-oriented application architectures.
• Experience using Entity Framework or Entity Framework Core and other common data-access technologies.
• Experience with source-control and collaborative development tools such as Git, Azure Dev Ops, Git Hub, or comparable platforms.
• Experience developing and supporting applications through the complete software development lifecycle.
• Experience working in Agile or Scrum development environments.
• Experience troubleshooting complex application, database, API, integration, and production-support issues.
• Understanding of application security, authentication, authorization, input validation, error handling, logging, and secure coding practices.
• Ability to independently analyze requirements, develop technical solutions, and complete complex assignments with limited supervision.
• Strong analytical, problem-solving, documentation, and communication skills.
• Ability to collaborate effectively with developers, analysts, product owners, testers, Dev Ops personnel, and customer stakeholders.

• Advanced degree in Computer Science, Information Systems, Engineering, Business, or a related discipline.
• Experience modernizing or migrating legacy .NET Framework applications to current .NET platforms.
• Experience developing applications using microservices, containerization, or cloud-native architectural approaches.
• Experience with Microsoft Azure, Azure App Services, Azure Functions, Azure SQL, or other cloud-development…