Senior Software Engineer (.NET)
Harmonia Holdings Group•McLean, VA
•Hybrid
About The Position
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.
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
- 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
Nice To Haves
- Microsoft Azure certifications (preferred)
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
Benefits
- Traditional and HSA- eligible medical insurance plans
- 100% employer-paid dental and vision insurance options
- 100% employer-sponsored STD, LTD, and life insurance
- 5% 401(k) company matching
- Flexible-schedules and teleworking options
- Paid holidays and PTO Accrual Plans
- Paid Parental Leave
- Professional development and career growth opportunities
- Team and company-wide events, recognition, and appreciation
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What This Job Offers
Job Type
Full-time
Career Level
Mid Level
Number of Employees
101-250 employees
