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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.Job DescriptionNetwork 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, DevOps 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.Requirements:U.S. Citizenship is requiredMust be able to obtain a Public Trust clearanceThis position requires working onsite in Alexandria, VA, 5 days per weekQualifications and Experience: 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 experienceAdvanced 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 TypeScript.Advanced Microsoft SQL Server development experience, including complex queries, stored procedures, database design, and performance tuning.Strong proficiency with HTML, CSS, JavaScript, TypeScript, 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 DevOps, GitHub, 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, DevOps personnel, and customer stakeholders.Preferred Qualifications: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 technologies.Experience with Docker, Kubernetes, or related container technologies.Experience implementing automated build, testing, and deployment pipelines.Experience with CI/CD platforms such as Azure DevOps, GitHub Actions, or Jenkins.Experience with automated testing frameworks such as xUnit, NUnit, Jasmine, Karma, Cypress, or comparable tools.Familiarity with OWASP secure-development principles and secure software development lifecycle practices.Experience developing applications in Federal Government, government-contracting, regulated, or security-sensitive environments.Microsoft or other relevant software-development certificationsResponsibilitiesApplication Design and Development:Design, develop, test, deploy, and maintain enterprise applications using C#, ASP.NET Core, and current supported versions of .NET.Develop scalable, maintainable, and reusable application components that support complex business and operational requirements.Participate in application architecture and technical design discussions and recommend practical solutions based on established engineering principles.Analyze existing applications and recommend improvements to application performance, reliability, security, usability, and maintainability.Modernize legacy applications and assist with the migration of existing solutions to current .NET technologies and architectural patterns.Troubleshoot and resolve complex application, integration, database, and production-support issues. API and Integration Development:Design, develop, document, and maintain secure RESTful APIs, web services, and application integrations.Develop service-oriented and microservices-based components where appropriate.Integrate applications with internal systems, external platforms, databases, and third-party services.Implement appropriate authentication, authorization, validation, logging, exception handling, and data-protection controls.Monitor and optimize API performance, reliability, and scalability.Front-End Development:Design and develop responsive, accessible, and user-friendly web interfaces using Angular, TypeScript, HTML, and CSS.Build reusable front-end components and services that support consistent application behavior and presentation.Collaborate with users, product owners, and design professionals to translate functional requirements into effective user experiences.Troubleshoot browser, performance, usability, and front-end integration issues.Maintain alignment between front-end functionality and supporting back-end services.Database Development:Design and maintain relational database structures using Microsoft SQL Server.Develop complex SQL queries, stored procedures, functions, views, and data-access components.Analyze and improve database performance through query optimization, indexing, execution-plan analysis, and other tuning techniques.Support data modeling, data validation, data integrity, migration, and application reporting requirements.Work with large or complex datasets while maintaining accuracy, security, and system performance.Software Development Lifecycle:Participate in all phases of the software development lifecycle, including requirements analysis, estimation, design, development, testing, deployment, documentation, and production support.Translate business, functional, and technical requirements into detailed application designs and working software solutions.Develop unit tests and support automated testing, integration testing, regression testing, and user acceptance testing.Participate in Agile ceremonies, including sprint planning, backlog refinement, daily standups, demonstrations, and retrospectives.Support application releases and coordinate deployment activities with DevOps, infrastructure, security, and operations teams.Create and maintain technical specifications, system documentation, release notes, operational procedures, and troubleshooting guidance.Engineering Quality and Technical Leadership:Apply secure coding practices, object-oriented design principles, design patterns, and established software-development standards.Conduct peer code reviews and provide constructive feedback to improve code quality, consistency, security, and maintainability.Identify technical risks, dependencies, performance concerns, and implementation challenges early in the development process.Provide technical guidance and mentoring to junior and mid-level developers.Contribute to engineering standards, development practices, reusable frameworks, and continuous-improvement initiatives.Evaluate emerging technologies and recommend tools or approaches that improve development quality, efficiency, and application performance.Collaborate effectively with technical and nontechnical stakeholders and clearly communicate technical issues, alternatives, and recommendations.Success in this position requires more than writing functional code. The Senior .NET Developer must be able to understand complex business needs, develop sustainable technical solutions, identify risks, communicate clearly, and consistently deliver secure, reliable, and maintainable software.The successful candidate will demonstrate strong technical judgment, personal accountability, attention to detail, and a commitment to continuous improvement while contributing positively to a collaborative development team. Compensation and Benefits:At NDi, we value our team and are committed to retaining top talent by offering competitive benefits and compensation packages. Our employee benefits package includes comprehensive health, dental, vision, pet, and legal insurance. Our corporate benefits include 401(k) retirement matching, paid leave, paid holidays, and health and wellness programs. In addition, we provide employer-paid life and disability insurance, professional development, education benefits, and much more to ensure our team has the resources they need to thrive on and off the job.Veterans First Commitment:As a Service-Disabled Veteran-Owned Small Business (SDVOSB), NDi is dedicated to hiring veterans and providing a supportive work environment that honors their service while recognizing the unique skills and experiences they bring to our organization.Our Commitment:Qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, protected veteran status or other characteristics protected by law.Apply Now: Take advantage of this unique opportunity to join one of the fastest-growing companies in Federal contracting!