Lead .Net Developer (Secret clearance)
Reston, VA
Experience: 15
Education: BA, BS
Category: Information Technology
Contractor Work Model: Onsite
Brand: System One
Job ID: 379173
Date Posted: 08/28/2026
Shortcut: http://jobs.systemone.com/p4Pt8U
Lead .Net Developer
Arlington, VA or Merrifield, VA - ONSITE
Secret Clearance is required to start
Must be able to obtain DEA clearance – 2-6 month process
Responsibilities:
• Lead a team of 5-7 developers in support of the mission with an ability to guide them on technical decisions, best practices, and team efficiencies
• Lead technical planning meetings
• Conduct peer code reviews and final code reviews
• Demonstrate soft skills in terms of professionalism, conduct and execution in a client-facing role
• Have an ability to effectively collaborate with leadership and customers
• Ensure the Requirements Analysts data is accurately reflected in the appropriate system of record
• Ensure quality and integrity of the software prior to it reaching production
• Apply modern software development techniques for a modular system
• Have an ability to learn new technologies as they are introduced, and the software applications and environment evolves
• Support modernization of software development practices
• Significant recent C# development experience.
• Significant recent Java Script development experience.
• Significant development experience with Cascading System Sheets (CSS).
• Experience with relational data models and SQL.
• Experience with XML and programming libraries for XML manipulation.
• Agile project and development experience utilizing Team Foundation Server.
• Ability to quickly deliver small projects, and to frequently transition between projects and applications.
• Experience in packaging and delivering software and documentation to a production environment.
Requirements:
• Experience as a developer in a software environment that supported more than 10,000 users and a Relational Database Management Systems (RDBMS) with more than 250 tables and 1 million total rows.
• Experience in at least one software development environment with a minimum of 1,000 automated unit tests.
• Recent development experience (at least 5+ years) with ASP.NET MVC based web development using Visual Studio..
• Must have an Active Secret clearance in order to view, discuss, and handle classified data in support of applications.
Experience/Education:
• Minimum 15 years of web development experience.
• Minimum 5 year of .Net Core/Standard development experience.
• Minimum 10 years of ASP.Net C# MVC based web development experience using Visual Studio 2017 or higher.
• Minimum 8 years of experience with Agile development methodologies including participation in Sprints, Backlog grooming, and Agile Ceremonies.
• Bachelor’s degree in a related technical field, desired
Nice to Have:
• 5+ years of e-GIS experience, including:
• Geolocation from addresses to Lat/Long.
• Utilizing mapping software in a web context (e.g., Open Street Maps or similar).
• Displaying and placing marking pins on satellite imagery.
• Leveraging distance measurement tools on maps in a web browser.
System One, and its subsidiaries including Joulé and Mountain Ltd., are leaders in delivering outsourced services and workforce solutions across North America. We help clients get work done more efficiently and economically, without compromising quality. System One not only serves as a valued partner for our clients, but we offer eligible employees health and welfare benefits coverage options including medical, dental, vision, spending accounts, life insurance, voluntary plans, as well as participation in a 401(k) plan.
System One is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex (including pregnancy, childbirth, or related medical conditions), sexual orientation, gender identity, age, national origin, disability, family care or medical leave status, genetic information, veteran status, marital status, or any other characteristic protected by applicable federal, state, or local law.
#M1
#LI-VH1
Ref: #851-Rockville-S1
-
Senior .Net Application Developer (Secret clearance)
Reston, VA
Senior .Net Developer Arlington, VA or Merrifield, VA - ONSITE Secret Clearance is required to start Must be able to obtain DEA clearance – 2-6 month process Responsibilities: • Works in a collaborative team environment to develop and enhance code for ...
Date Posted: 08/28/2026 Recommended
-
Senior Software Engineer
Fort Belvoir, Virginia
Staff Software Engineer, Defense Applications Location: Fort Belvoir, Virginia - Onsite Openings: 2 Clearance Requirement: Must have an active Secret clearance Employment Type: Direct hire or temp to perm Position Overview System One IT is seeking two ...
Date Posted: 09/02/2026 Recommended
-
Senior Product Designer (Secret Clearance) onsite
Newport News, Virginia
Senior Product Designer Secret clearance required to start Newport News, VA - onsite System One is seeking a Senior Product Designer to shape the applications, workflows, and user experiences supporting a U.S. Army enterprise data environment. You will...
Date Posted: 09/14/2026 Recommended
-
Information Systems Security Engineer (ISSE)
Hanscom AFB,, MA
Job Title: Information Systems Security Engineer (ISSE) Location: Hanscom AFB, MA Type: Contract To Hire Compensation: $180,000.00 - $195,000.00 Work Model: Onsite – onsite Hours: 40 hrs a week. Security Clearance: Must have active Top Secret clearance...
Date Posted: 09/22/2026 Recommended
-
Configuration Manager / Drafter / Designer
Lynnwood, WA
Job Title: Configuration Manager / Drafter / Designer Location: Lynnwood, WA (onsite) Type: Contract Compensation: $69.83/HR on W2 Security Clearance: Secret security clearance is required. Must be US Citizen. Responsibilities Create, update, and manip...
Date Posted: 09/22/2026 Recommended
-
Jr. Software Test Engineer
Huntsville, AL
Job Title: Jr. Software Test Engineer (Contract-to-Hire) Location: Huntsville, AL (On-site) Security Clearance: Active Secret preferred OR ability to obtain Pay Rate: $62-68/hr (W2) About the role Join a team supporting defense/tactical systems where y...
Date Posted: 09/01/2026 Recommended
-
Jr. Software Engineer C/C++
Huntsville, AL
LOCATION: Huntsville, AL (100% onsite) TYPE: Contract-to-hire | 40 hrs/week COMPENSATION: $62-67/hr (W2) CLEARANCE: Active Secret clearance (or ability to obtain) OVERVIEW System One is hiring a Software Engineer with strong C/C++ experience to support...
Date Posted: 09/01/2026 Recommended
-
Senior Software Engineer C#
Merrifield, Virginia
Senior Software Engineer C/C++ or C# Software Engineer Direct-Hire Location: Merrifield, VA – 4 days on-site/ 1 day remote Annual Salary Range: $105,000 to $120,000 plus benefits Federal End Customer: US Citizenship, eligibility for a Public Trust clea...
Date Posted: 09/08/2026 Recommended
-
UI/UX Developer
McLean, VA
Job Title: UI/UX Developer Location: McLean, VA – can work Offsite Type: Contract To Hire Compensation: Not specified Work Model: REMOTE Critical Competencies A critical competency for this role is the ability to leverage agentic AI development tools (...
Date Posted: 09/02/2026 Recommended
-
Sr. GIS Developer - HYBRID
Towson, Maryland
Job Title: Sr. GIS Developer/Systems Analyst - HYBRID Location: Towson, Maryland Type: Contract Compensation: $45.00 - $60.00 per hour Work Model: Hybrid – onsite and remote Hours: 40.0 per week Responsibilities Perform application development and supp...
Date Posted: 09/22/2026 Recommended
-
Azure Integration & DevOps Engineer
Arlington, VA
Azure Integration & DevOps Engineer Contract to Hire Arlington, VA: On-Site 4 days a week / 1 day remote Hourly Rate: $90/hr. W2. Benefits Available Conversion Salary: $180,000 annually plus benefits. Clearance: Active Secret Clearance Required (TS is ...
Date Posted: 08/25/2026 Recommended
-
Full Stack C/C++ Developer - Aerospace & Defense Systems
Huntsville, AL
Job Title: Full Stack C/C++ Developer – Aerospace & Defense Systems Location: Huntsville, AL (Onsite) Type: Contract-to-Hire Pay (W2): $77-82/HR Clearance: Active Secret clearance (or ability to obtain) Overview Join a team building and supporting miss...
Date Posted: 08/31/2026 Recommended
-
Staff Product Designer, Mission Applications
Fort Belvoir, Virginia
Job Title: Staff Product Designer, Mission Applications Location: Fort Belvoir, VA Type: Contract To Hire Work Model: Onsite Security Clearance: Secret clearance Join a high-performing team supporting mission-critical digital transformation initiatives...
Date Posted: 09/04/2026 Recommended
-
Sr DevSecOps Engineer
Fort Meade, Maryland
DevSecOps Generalist Clearance: Secret Clearance or Higher Location: Ft Meade, Hybrid (3 days a week on-site) Travel: 10% Position Type: Full-Time, direct hire Compensation Range: $120K-$140K annually, plus benefits Company Overview: System One IT is s...
Date Posted: 09/21/2026 Recommended
-
Embedded Software Engineer C/C++
Huntsville, AL
Job Title: Embedded Software Engineer (C/C++) Location: Huntsville, AL (Onsite) Type: Contract-to-hire Compensation: $77-80/HR Clearance: Active Secret clearance or ability to obtain Experience: 4+ years (or 2+ with a Master’s) About the role We’re hir...
Date Posted: 09/01/2026 Recommended
-
Nuclear Plant Engineering Program Specialist
Bellevue, WA
Job Title: Nuclear Plant Engineering Program Specialist Location: Bellevue, WA Type: Contract (yearlong) Compensation: $56.00 - $95.00 Contractor Work Model: Fully Remote Hours: 40.0 Overview System One is hiring a Nuclear Operations Specialist and Pro...
Date Posted: 08/28/2026 Recommended
-
Mid Embedded Software Engineer (C/C++)
Huntsville, AL
Location: Huntsville, AL (Onsite) Type: Contract-to-hire Pay Rate: $97-102/hr (W2) Clearance: Active Secret clearance (or ability to obtain) Overview We’re looking for a mid-level Embedded Software Engineer to help build and integrate mission-critical ...
Date Posted: 09/01/2026 Recommended
-
Lead Test Engineer - Senior - 100% remote
Merrifield, VA
Title: Lead Test Engineer Location: 100% Remote Pay Rate: Open to Both W2 and established 1099's Position Type: Contract, long term expected Candidates MUST LIVE in the United States and be able to pass both a credit and criminal background check. This...
Date Posted: 09/17/2026 Recommended
-
Mid Software Test Engineer
Huntsville, AL
Mid Software Test Engineer (Automated Testing) Location: Huntsville, AL (On-site) Type: Contract (Contract-to-hire) Pay: $77–$85/hr (W2) Clearance: Active Secret preferred; must be able to obtain/maintain What you’ll do Build and maintain automated tes...
Date Posted: 09/01/2026 Recommended
-
User Activity Monitor (UAM) Engineer
Lorton, VA
Job Title: User Activity Monitor (UAM) Engineer Location: Springfield/Alexandria. (onsite) Type: Contract To Hire Compensation: $80.50 - 96.15/HR on W2 Security Clearance: Top Secret/SCI Responsibilities Support the User Activity Monitor Software solut...
Date Posted: 08/18/2026 Recommended
-
Mid Level Software Engineer C#
Merrifield, Virginia
Mid-Level Software Engineer C/C++ or C# Software Engineer Direct-Hire Location: Merrifield, VA – 4 days on-site/ 1 day remote Annual Salary Range: $95,000 to $105,000 plus benefits Federal End Customer: US Citizenship, eligibility for a Public Trust cl...
Date Posted: 09/08/2026 Recommended
-
Fullstack Developer
New Carrolton, Maryland
Full Stack Developer Location: New Carrollton, Maryland Work Arrangement: Onsite or remote options may be available, subject to client confirmation and project requirements Employment Type: Contract to Hire We are seeking a Full Stack Developer to supp...
Date Posted: 09/21/2026 Recommended
-
Principal Product Technology Lead – Application Software
Lakewood, CO
Job Title: Principal Product Technology Lead – Application Software Location: Lakewood, CO Type: Direct Hire Work Model: Onsite – onsite Overview System One is looking for a Principal Product Technology Lead - Application Software for a direct hire/per...
Date Posted: 09/14/2026 Recommended
-
Principal Product Technology Lead – Application Software
Lakewood, CO
Job Title: Principal Product Technology Lead – Application Software Location: Lakewood, CO Type: Direct Hire Work Model: Onsite – onsite Overview System One is looking for a Principal Product Technology Lead - Application Software for a direct hire/per...
Date Posted: 09/11/2026 Recommended
-
I&C Design Engineer
Bellevue, WA
Job Title: Design Engineer Type: Contract Compensation: $52 - $85 hourly Contractor Work Model: Remote Overview: We are seeking a talented and experienced Design Engineer specializing in Instrumentation and Control (I&C) for a contract opportunity with...
Date Posted: 09/03/2026 Recommended
-
Operations Research Analyst - TS/SCI
Kirtland AFB, New Mexico
Job Title: Sr. Operations Research Analyst Location: Kirtland AFB, New Mexico Type: Contract To Hire Compensation: $130,000 Work Model: Onsite Hours: 40 hrs a week Clearance: TS/SCI Responsibilities Formulate mathematical or simulation models of proble...
Date Posted: 09/09/2026 Recommended
-
Sr Solutions Architect (Workday HCM, Time Tracking and Absence)
Norcross, GA
Job Title: Sr Solutions Architect (Workday HCM, Time Tracking and Responsibilities • Act as a trusted advisor to HR, Payroll, IT and business leaders, lead the end-to-end solution architecture for Workday HCM, Time Tracking, and Absence modules • Desig...
Date Posted: 06/29/2026 Recommended
-
Software Developer (CNO)
Fort Meade, Maryland
Job Title: Software Developer (CNO) Location: Fort Meade, Maryland Type: Contract To Hire Work Model: Onsite Security Clearance: TS/SCI CI Poly Contact: Crystal.dinnocenti@systemone.com RESPONSIBILITIES Lead the designing, developing, documenting, test...
Date Posted: 07/01/2026 Recommended
-
Unix/Linux Administrator
Washington DC, Maryland
Senior UNIX Linux Systems Engineer Washington, DC Hybrid – On-Site 2 days per week Hourly Rate: $75/hr. W2 Benefits Available Conversion Salary: Up to $150,000 annually, plus benefits Federal End Customer – US Citizenship Required Clearance: Public Tru...
Date Posted: 09/09/2026 Recommended
-
AWS Python Developer
Lafayette, Louisiana
Job Title: AWS Python Developer Location: Lafayette, Louisiana, United States Type: Direct Hire Work Model: Hybrid – onsite and remote Overview System One is seeking an experienced AWS Python Developer to support the development and modernization of cl...
Date Posted: 09/17/2026 Recommended