What are the responsibilities and job description for the Senior Software Engineer (.NET) position at Harmonia Holdings Group, LLC?
Harmonia Holdings Group, LLC is an award-winning, rapidly growing federal government contractor committed to providing innovative, high-performing solutions to our government clients and focused on fostering a workplace that encourages growth, initiative, creativity, and employee satisfaction.
Description
Title: Senior Software Engineer (.NET)
Location: Hybrid within McLean, VA
Terms: Full-time
Clearance: Public Trust Eligible
Position Description
We are seeking a Senior Software Engineer (.NET) that will be responsible for delivering high-quality, maintainable software across the full stack. You will work across backend services, web applications, and database layers while collaborating with cross-functional teams in an Agile environment.
This role requires strong technical depth, disciplined engineering practices, and the ability to troubleshoot complex issues across multiple tiers.
Responsibilities:
- Design, develop, and maintain applications using C# and the .NET stack (MVC, .NET Core, Web API)
- Build and enhance web applications using ASP.NET Web Forms and modern front-end technologies (JavaScript, TypeScript, CSS/SASS, Bootstrap)
- Develop and optimize data access layers using Entity Framework, LINQ, and ADO.NET
- Write and tune SQL Server objects (T-SQL, stored procedures, UDFs, triggers)
- Support database architecture and participate in migration efforts
- Design and maintain service-oriented components (WCF)
- Implement unit testing using NUnit, MSTest, or similar frameworks
- Troubleshoot issues across application, database, and server layers
- Collaborate with development teams to deliver high-quality solutions
- Participate in Agile ceremonies and continuous improvement efforts
Requirements
- Bachelor’s degree in Computer Science or related field with 7 years of experience
- Ability to obtain and maintain a Public Trust clearance; active public trust is preferred
- Strong experience with C# and the .NET ecosystem (.NET Core, MVC, Web API, WCF)
- Strong experience with SQL Server (including T-SQL and database design)
- Experience building and maintaining full-stack applications
- Hands-on experience with Azure DevOps, CI/CD pipelines, and release management
Knowledge, Skills, and Abilities
- Strong problem-solving ability across application, database, and infrastructure layers
- Ability to write clean, efficient, and testable code
- Experience working in Agile delivery environments
- Familiarity with static code analysis tools (e.g., SonarQube)
- Experience with modern AI platforms and services, preferably within the Microsoft ecosystem (Azure AI, Azure OpenAI)
- Excellent written and verbal communication skills with the ability to partake in oral presentations
- Microsoft Azure certifications (preferred)