C# Jobs in Fairfax, VA

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Senior Web Application Penetration Tester

Costar Group

•

Arlington, Virginia, USA

Full-time

Senior Web Application Penetration Tester Job Description Overview CoStar Group (NASDAQ: CSGP) is a leading global provider of commercial and residential real estate information, analytics, and online marketplaces. Included in the S&P 500 Index and the NASDAQ 100, CoStar Group is on a mission to digitize the world's real estate, empowering all people to discover properties, insights and connections that improve their businesses and lives. We have been living and breathing the world of real est
Posted 21 days ago | Updated 10 hours ago

DevOps Engineer - TS/SCI w/Polygraph

General Dynamics

•

McLean, Virginia, USA

Full-time

Type of Requisition: Regular Clearance Level Must Currently Possess: Top Secret SCI + Polygraph Clearance Level Must Be Able to Obtain: Top Secret SCI + Polygraph Public Trust/Other Required: None Job Family: Systems Engineering Job Qualifications: Skills: DevOps, DevSecOps, Git, Kubernetes, Linux Certifications: None Experience: 3 + years of related experience ship Required: Yes Job Description: Ensure the safety and security of our nation as a Systems Engineer (DevOps) at GDIT. Our wo
Posted 12 days ago | Updated 10 hours ago

Senior Software Engineer (.NET)

Costar Group

•

Arlington, Virginia, USA

Full-time

Senior Software Engineer (.NET) Job Description CoStar Group (NASDAQ: CSGP) is a leading global provider of commercial and residential real estate information, analytics, and online marketplaces. Included in the S&P 500 Index and the NASDAQ 100, CoStar Group is on a mission to digitize the world's real estate, empowering all people to discover properties, insights and connections that improve their businesses and lives. We have been living and breathing the world of real estate information an
Posted 20 days ago | Updated 10 hours ago

Engineering Technician (SECRET) 1

Harris Corporation

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Ashburn, Virginia, USA

Full-time

L3Harris is dedicated to recruiting and developing high-performing talent who are passionate about what they do. Our employees are unified in a shared dedication to our customers' mission and quest for professional growth. L3Harris provides an inclusive, engaging environment designed to empower employees and promote work-life success. Fundamental to our culture is an unwavering focus on values, dedication to our communities, and commitment to excellence in everything we do. L3Harris Technologie
Posted 12 days ago | Updated 10 hours ago

MS Dynamics 365 Developer

Apex Systems

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Arlington, Virginia, USA

Full-time

Job#: 2079442 Job Description: (100% Remote) MS D365 Software Developer - $140,000 - $150,000 - Apex Systems has an Immediate Need for a (100% Remote) MS D365 Software Developer !! This will be an "est. 6-12 Month Contract to Possible Permanent Hire" opportunity, supporting one of our Largest DoD / Government Clients on the East Coast & Nationwide! Please See Below for all Position Details & How To Apply. HOW TO APPLY Email a Resume to: - Job Title: MS D365 Software Developer - Location:
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Posted 9 days ago | Updated 10 hours ago

Senior Cyber Capability Developer (Reverse Engineer)

Leidos

•

Lorton, Virginia, USA

Full-time

Looking for an opportunity to make an impact? At Leidos, we deliver innovative solutions through the efforts of our diverse and talented people who are dedicated to our customers' success. We empower our teams, contribute to our communities, and operate sustainably. Everything we do is built on a commitment to do the right thing for our customers, our people, and our community. The Leidos National Security Sector combines technology-enabled services and mission software capabilities in the area
Posted 42 days ago | Updated 10 hours ago

Multi-disciplinary Engineer II

Nightwing

•

Springfield, Virginia, USA

Full-time

Nightwing provides technically advanced full-spectrum cyber, data operations, systems integration and intelligence mission support services to meet our customers' most demanding challenges. Our capabilities include cyber space operations, cyber defense and resiliency, vulnerability research, ubiquitous technical surveillance, data intelligence, lifecycle mission enablement, and software modernization. Nightwing brings disruptive technologies, agility, and competitive offerings to customers in th
Posted 3 days ago | Updated 10 hours ago

Senior Engineer, Software (R3589)

Shield AI Inc

•

Washington, District of Columbia, USA

Full-time

Founded in 2015, Shield AI is a venture-backed defense technology company with the mission of protecting service members and civilians with intelligent systems. Its products include the V-BAT aircraft, Hivemind Enterprise, and the Hivemind Vision product lines. With offices in San Diego, Dallas, Washington, D.C., Boston, Abu Dhabi (UAE), Kyiv (Ukraine), and Melbourne (Australia), Shield AI's technology actively supports U.S. and allied operations worldwide. For more information, visit Follow Sh
Posted 30 days ago | Updated 10 hours ago

Senior Engineering Manager / Software - Flight Simulation (Onsite)

RTX Corporation

•

Sterling, Virginia, USA

Full-time

Date Posted: 2025-06-27 Country: United States of America Location: HVA34: Sterling, VA 22640 Davis Dr , Sterling, VA, 20164-7104 USA Position Role Type: Onsite U.S. Citizen, U.S. Person, or Immigration Status Requirements: Active and transferable U.S. government issued security clearance is required prior to start date.Security Clearance: DoD Clearance: Secret Senior Engineering Manager / Software - Flight Simulation (Onsite) The Simulation & Training Solutions (STS) Software Engineering de
Posted 19 days ago | Updated 10 hours ago

Application/Cloud Developer

Nightwing

•

Sterling, Virginia, USA

Full-time

Nightwing provides technically advanced full-spectrum cyber, data operations, systems integration and intelligence mission support services to meet our customers' most demanding challenges. Our capabilities include cyber space operations, cyber defense and resiliency, vulnerability research, ubiquitous technical surveillance, data intelligence, lifecycle mission enablement, and software modernization. Nightwing brings disruptive technologies, agility, and competitive offerings to customers in th
Posted 60+ days ago | Updated 10 hours ago

Production Support Engineer

Lumen Solutions Group Inc.

•

Reston, Virginia, USA

Contract

Job Title: Control-M Heavy - Production Support Req ID: 44182 Location: DMV Area (Local candidates strongly preferred) Employment Type: Full-Time Experience Level: 2-5 Years About the Role: We are seeking a dynamic and motivated Production Support Engineer with strong expertise in Control-M automation to join our growing team. This role is ideal for early-career professionals who bring energy, adaptability, and a passion for automation and support excellence. You will play a key role in ensuring
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Posted 60+ days ago | Updated 5 hours ago

Application Developer

BCforward

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Remote

Contract

BCforward is currently seeking a highly motivated Opportunity Application Developer 4in Redmond WA Position Title: Applications Developer 4 Location: Fully Remote Anticipated Start Date: - ASAP Please note this is the target date and it is subject to change. BCforward will send official notice ahead of a confirmed start date. Expected Duration: 12 Months Contract Job Type: Contract and Remote Pay Range: $70/hr. - $75/hr. Please note that actual compensation may vary within this range due
Posted 8 days ago | Updated 2 hours ago

Secret Cleared Microsoft PowerApps/Dynamics Developer

ALTA IT Services

•

Arlington, Virginia, USA

Full-time

Job Title: Secret Cleared Microsoft PowerApps/Dynamics Developer Location: Arlington, VA Type: Contract To Hire Compensation: 130-160K Contractor Work Model: Onsite Security Clearance: Secret clearance is required Job Description: ALTA IT Services is seeking a Microsoft PowerApps/Dynamics Developer! You will join a team that uses PowerApps and Dynamics 365 to develop and deploy applications in our Dynamics/365 environment (Azure GCC). You'll provide software engineering and development support
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Posted 21 days ago | Updated 7 hours ago

Software Engineer, Lead

American Systems Corporation

•

Washington, District of Columbia, USA

Full-time

Overview AMERICAN SYSTEMS is an employee-owned federal government contractor supporting national priority programs through our strategic solutions in the areas of Information Technology, Test & Evaluation, Program Mission Support, Engineering & Analysis, and Training. THIS POSITION INCLUDES A $5,000 SIGN-ON BONUS! Responsibilities As a Lead Software Engineer with AMERICAN SYSTEMS you will have the opportunity to do the following: Work across cloud and on-premises environments using the lates
Posted 11 days ago | Updated 10 hours ago

C++ Developer

Reveille Technologies

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Remote

Third Party, Contract

Bachelor s degree in computer science, Software Engineering, or a related field.15+ years of experience in software development , with 5 10 yrs focused experience in C++/CLI, .NET Core framework, foundational libraries, Windows SDK, compilers, and kernel experienceHaving experience in bridging native code in pure C++ and managed code like C#Linux and Windows SDK experienceExperience with Visual Studio, GitHub and git related develop environmentsExperience with high-performance, multi-thread, sca
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Posted 11 hours ago

Systems Administrator

New Era Technology

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Remote

Contract

6 years experience with Teamcenter and NX Configurations and customizations. Experience in developing NX custom tools and Customize NX application. Experience in NXOpen using VB.Net,C# in visual Studio. ->NX Menu ,Ribbon, site, template files scripting experience. ->Block Styler and winform UI based tools creation. Teamcenter ITK customizations using ITK and pdm server calls. Experience with Teamcenter/NX managed mode and native NX customizations. Documentation experience to create test case doc
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Posted 1 day ago

.Net Fullstack Developer

Synchronisys

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Remote

Contract

Only W2 candidates accepted for this opportunity. .Net Developer | Mortgage Domain/ Experience 100% Remote Must Have: Frontend: Strong experience with Angular, RxJs and NgRx, including reactive forms and component-driven architecture.Backend: Solid command of C#/.NET, with an understanding of modern API development patterns.Testing Mindset: Comfort with unit testing for both frontend and backend components.Experience navigating large-scale internal systems and modular codebases.Bonus: Familiarit
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Posted 10 hours ago

Offensive Software Developer

Parsons Services Company

•

Fort Belvoir, Virginia, USA

Full-time

In a world of possibilities, pursue one with endless opportunities. Imagine Next! When it comes to what you want in your career, if you can imagine it, you can do it at Parsons. Imagine a career working with exceptional people sharing a common quest. Imagine a workplace where you can be yourself. Where you can thrive. Where you can find your next, right now. We've got what you're looking for. Job Description: Parsons is looking for an amazingly talented Software Developer to join our team! In
Posted 60+ days ago | Updated 10 hours ago

Gameplay Software Engineer II

BCforward

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Remote

Contract

Gameplay Software Engineer II BCforward is currently seeking a highly motivated Gameplay Software Engineer II for a REMOTE opportunity. Position Title: Gameplay Software Engineer II Location: PST preferred - remote Anticipated Start Date: July 24, 2025 Please note this is the target date and it is subject to change. BCforward will send official notice ahead of a confirmed start date. Expected Duration: 06 Months Job Type: Contract - [FULL TIME (40 Hours a week)] Pay Range: $70.73/hr-$75.4
Posted 12 days ago | Updated 2 hours ago

Software Technical Lead

Jacobs

•

Herndon, Virginia, USA

Full-time

Are you interested in using your skills to help shape the Cyber, Security, & Intel space? If so, look no further. Amentum is seeking a Software Technical Lead to join our team of passionate individuals in Herndon, VA. In this role you will support challenging, mission-critical projects that make a direct impact on the Nation's security and intelligence mission. Your Impact: We are seeking a highly skilled Technical Lead to spearhead software development initiatives within our dynamic team. The
Posted 60+ days ago | Updated 10 hours ago