C# Software Developer Jobs in Reston, VA

AsSoftware Developer youll be involved in collaborating with cross-functional teams to translate business requirements into technical solutions designing and maintaining applications and leading the software development lifecycle. Youll also mentor junior developers while staying updated on industr...

Position:Software DeveloperLCAT:SeniorLocation:Reston VirginiaThis position is contingent upon award.Required clearance:TS/SCI with willingness to take CI poly.Candidates with current CI poly taken within the past seven years will be prioritized.Required experience:At least 11 yearsRequired educatio...

Leidos is seeking candidates for security clearance sponsorship in support of a Northern Virginia client. If selected by the program and client for upgrade sponsorship the candidate will be submitted for Top Secret/SCI with polygraph security clearance.Candidates who are selected for upgrade and who...

Calling all innovators - find your future at Fiserv.Were Fiserv a global leader in Fintech and payments and we move money and information in a way that moves the world. We connect financial institutions corporations merchants and consumers to one another millions of times a day - quickly reliably an...

The Analysis Solutions Business Area at Leidos is seeking Software Developers at multiple experience levels to support a government customer in Reston VA. Candidates will join a fast-paced mission-focused team of government and contractor personnel developing innovative software and data-driven solu...

Looking for an opportunity to make an impactAt 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 andoperatesustainable. Everything we do is built on a commitment...

DescriptionThe Engineer in this role will be supporting DIA customers in the maintenance functionality and sustainment of Zero Trust Environments. This support will include but is not limited to working in a DevOps environment to support the research into existing software applications required for...

Leidos has a job opening beginning in the Spring of 2026 for a Software Developer/Engineer Intern/Co-Op in Reston VA. Work will consist of a wide range of project tasks to include: web application design and development securing application components including communications multi-factor authentica...

DescriptionThe Engineer in this role will be supporting DIA customers in the maintenance functionality and sustainment of Zero Trust Environments. This support will include but is not limited to working in a DevOps environment to support the research into existing software applications required for...

Leidos is seeking an Automated Testing Software Developer to support a government contract in the National Capital Region (NCR). The ideal candidate will be able to develop test programs to support automated test systems primarily using LabVIEW and/or Python. The Automated Testing Software Developer...

ATTENTION MILITARY AFFILIATED JOB SEEKERS - Our organization works with partner companies to source qualified talent for their open roles. The following position is available to Veterans Transitioning Military National Guard and Reserve Members Military Spouses Wounded Warriors and their Caregivers....

DescriptionThe Engineer in this role will be supporting DIA customers in the maintenance functionality and sustainment of Zero Trust Environments. This support will include but is not limited to working in a DevOps environment to support the research into existing software applications required for...