What are the responsibilities and job description for the Full Stack .NET Developer position at Harmonia Holdings Group, LLC?
Revolutional delivers advanced technology solutions and mission support to federal agencies across civilian, health, and national security environments. We apply modern capabilities, including AI/ML, cloud, cybersecurity, and IT modernization to solve complex challenges, enable faster and more secure operations, and drive measurable mission outcomes.
We are redefining how federal technology gets built and delivered by operating with a product mindset, prioritizing speed, ownership, and execution over bureaucracy.
Title: Full Stack .NET Developer
Location: Onsite (Washington, D.C.)
Terms: Full-time
Clearance: Active Top Secret with SCI eligibility required
Travel: 0-10%
Portfolio/Business Unit Context
This position supports Revolutional's customer, the U.S. Department of State, focused on secure application development and mobile-enabled mission capabilities. The environment is high-security and high-visibility, supporting systems that require reliability, performance, and continuous enhancement.
The core challenge: delivering secure, scalable applications while operating within strict compliance and classified environment constraints, without slowing down mission-critical delivery.
Position Description
As a Full Stack .NET Developer at Revolutional, you will design, build, and maintain secure, scalable applications in a classified environment. You will operate across the full stack, from backend services and database design to front-end user interfaces.
This role requires engineers who can consistently deliver production-quality software while navigating structured, security-conscious environments. You are expected to troubleshoot complex issues, contribute to modernization efforts, and take ownership of delivering reliable, mission-critical capabilities.
Responsibilities:
Baseline Requirements
Here at Revolutional we are pleased to have been repeatedly recognized for our outstanding work culture, the innovative work we do, and the employees on our team who make a difference each day. Some of these recognitions include:
Revolutional is an Equal Opportunity Employer providing equal employment opportunity to all employees and applicants for employment without regard to race, color, religion, national origin, age, gender, gender identity, sexual orientation, disability, or genetics. Revolutional does and will take affirmative action to employ and advance in employment individuals with disabilities and protected veterans. To perform the above job successfully, an individual must possess the knowledge, skills, and abilities listed; meet the education and work experience required; and must be able to perform each essential duty and responsibility satisfactorily. Other duties in addition to those listed may be assigned as necessary to meet business needs. Reasonable accommodation will be made to enable an applicant with a disability to successfully apply for and/or perform the essential duties of the job. If you are in need of an accommodation, please contact HR@revolutional.com.
We are redefining how federal technology gets built and delivered by operating with a product mindset, prioritizing speed, ownership, and execution over bureaucracy.
Title: Full Stack .NET Developer
Location: Onsite (Washington, D.C.)
Terms: Full-time
Clearance: Active Top Secret with SCI eligibility required
Travel: 0-10%
Portfolio/Business Unit Context
This position supports Revolutional's customer, the U.S. Department of State, focused on secure application development and mobile-enabled mission capabilities. The environment is high-security and high-visibility, supporting systems that require reliability, performance, and continuous enhancement.
The core challenge: delivering secure, scalable applications while operating within strict compliance and classified environment constraints, without slowing down mission-critical delivery.
Position Description
As a Full Stack .NET Developer at Revolutional, you will design, build, and maintain secure, scalable applications in a classified environment. You will operate across the full stack, from backend services and database design to front-end user interfaces.
This role requires engineers who can consistently deliver production-quality software while navigating structured, security-conscious environments. You are expected to troubleshoot complex issues, contribute to modernization efforts, and take ownership of delivering reliable, mission-critical capabilities.
Responsibilities:
- Design, develop, test, and maintain full stack applications using C# and the .NET ecosystem
- Build and enhance backend services, APIs, and data access layers
- Develop and maintain front-end components using modern web technologies (JavaScript, HTML, CSS)
- Design and optimize SQL Server databases, including stored procedures, functions, and performance tuning
- Troubleshoot issues across application, database, and infrastructure layers
- Identify and remediate security vulnerabilities in accordance with federal standards
- Support CI/CD pipelines and automated deployment processes
- Participate in Agile development processes, including sprint planning, demos, and retrospectives
- Contribute to secure mobile application support and integration efforts
- Backend: C#, .NET (Core, MVC), Web APIs
- Frontend: JavaScript, HTML, CSS
- Data: SQL Server, T-SQL, stored procedures
- Tools: Azure DevOps, TFS, Git
- Practices: Agile Scrum, CI/CD, secure software development
- Design, develop, test, and maintain full stack applications using C# and the .NET ecosystem
- Build and enhance backend services, APIs, and data access layers
- Develop and maintain front-end components using modern web technologies (JavaScript, HTML, CSS)
- Design and optimize SQL Server databases, including stored procedures, functions, and performance tuning
- Troubleshoot issues across application, database, and infrastructure layers
- Identify and remediate security vulnerabilities in accordance with federal standards
- Support CI/CD pipelines and automated deployment processes
- Participate in Agile development processes, including sprint planning, demos, and retrospectives
- Contribute to secure mobile application support and integration efforts
- Backend: C#, .NET (Core, MVC), Web APIs
- Frontend: JavaScript, HTML, CSS
- Data: SQL Server, T-SQL, stored procedures
- Tools: Azure DevOps, TFS, Git
- Practices: Agile Scrum, CI/CD, secure software development
Baseline Requirements
- Active Top Secret clearance with SCI eligibility.
- U.S. Citizenship required.
- 5 years of professional experience in .NET/C# development.
- Security certification.
- Strong experience building full stack applications using .NET frameworks (.NET Core, MVC, or similar).
- Proficiency with SQL Server, including T-SQL, stored procedures, and database design.
- Experience troubleshooting and debugging across multiple system layers.
- Familiarity with secure development practices in regulated or classified environments.
- Experience working in Agile development teams.
- Strong problem-solving and analytical skills.
- Ability to operate effectively in structured, security-conscious environments.
- Ownership mindset with accountability for delivering mission-critical systems.
- Effective communication and collaboration skills.
- Experience with Azure DevOps, TFS, or similar CI/CD tools.
- Familiarity with cloud platforms such as Azure or AWS.
- Experience with version control systems (Git, TFS).
- Knowledge of SharePoint integration or development.
- Exposure to secure mobile development or device management environments.
- Experience in client-facing or mission-driven environments.
Here at Revolutional we are pleased to have been repeatedly recognized for our outstanding work culture, the innovative work we do, and the employees on our team who make a difference each day. Some of these recognitions include:
- Recognized as a Top 20 "Best Place to Work in Virginia"
- Recipient of Department of Labor's HireVets Gold Medallion
- Great Place to Work Certification for five years running
- A Virginia Chamber of Commerce Fantastic 50 company
- A Northern Virginia Technology Council Tech 100 company
- Inc. 5000 list of fastest growing companies for eleven years
- Two-time SBA SBIR Tibbett's Award winner
- Virginia Values Veterans (V3) Certification
- 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-- and so much more!
Revolutional is an Equal Opportunity Employer providing equal employment opportunity to all employees and applicants for employment without regard to race, color, religion, national origin, age, gender, gender identity, sexual orientation, disability, or genetics. Revolutional does and will take affirmative action to employ and advance in employment individuals with disabilities and protected veterans. To perform the above job successfully, an individual must possess the knowledge, skills, and abilities listed; meet the education and work experience required; and must be able to perform each essential duty and responsibility satisfactorily. Other duties in addition to those listed may be assigned as necessary to meet business needs. Reasonable accommodation will be made to enable an applicant with a disability to successfully apply for and/or perform the essential duties of the job. If you are in need of an accommodation, please contact HR@revolutional.com.