Sr. Full Stack Developer -.Net​/C#

Leidos is partnering with the Department of Defense’s (DoD’s) MFLC Program to support to military service members and their families across the country and around the world. In support of this important mission, Leidos is hiring a Sr. Full Stack Developer (.Net/C#).

In this hands-on position, you will work collaboratively to architect, design, build, deliver, and enhance highly available, scalable real-time systems. You will exercise your judgment in determining and recommending the best designs based on customer business objectives, timelines, and other resource constraints. You will participate in and/or direct major deliverables of projects through all aspects of the software development life cycle, including scope and work estimation, architecture and design, coding, and unit testing.

* MUST BE A U.S. CITIZEN*

• Work in conjunction with other team members to manage the software life cycle from concept to deployment
• Maintaining and enhancing future iterations of software and testing based on agile requirements
• Team collaboration in a Scrum managed environment
• Testing framework development/implementation, automation implementation and results validation
• Modification, testing, troubleshooting, and improvement of previously developed programs
• Develop and maintain technical documentation
• Must be a self-starter, a strong team player, and have the ability to work independently with little supervisionli>

• BS degree and 8 – 12 years of prior relevant experience, or Masters with 6 – 10 years of prior relevant experience. May possess a Doctorate in technical domain
• Must have experience with JavaScript, Vue, and .Net Ecosystem: C#, .Net Core, Razor, and object-oriented programming principles
• Experience with relational databases
• Experience with an issue/problem tracking system (e.g., Jira)
• Experience with Git, CI/CD pipelines, testing frameworks, and testing automation
• Proficiency with MS Office Products (Word, Excel, Visio, & PowerPoint)
• Knowledge of modern software design architectures
• Excellent problem-solving and communication skills

• Experience with configuring and deploying in AWS environments, including EC2s, ECS, and RDS
• Experience with AWS Gov Cloud
• Experience with MySQL
• Experience with Medallion Data Architecture design
• Experience with Unit, functional, API, and Integration testing
• Experience with containerization/orchestration

If you're looking for comfort, keep scrolling. At Leidos, we outthink, outbuild, and outpace the status quo — because the mission demands it. We're not hiring followers. We're recruiting the ones who disrupt, provoke, and refuse to fail. Step 10 is ancient history. We're already at step 30 — and moving faster than anyone else dares.

Original Posting:
February 20, 2026

For U.S. Positions:
While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above.

Pay Range $ - $

The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.