We’re looking for an experienced Senior Software Developer to join our growing team. The ideal candidate is a strong full-stack engineer who is comfortable working across modern front-end frameworks and .NET back-end technologies. This is a great opportunity to contribute to the architecture, design, and development of scalable, secure, and high-performing business solutions.
Key Responsibilities
- Design, develop, and maintain web applications using .NET Core, Entity Framework Core, and ReactJS.
- Implement modern front-end experiences with Vite and other modern build tools.
- Develop and maintain integrations and customizations within SharePoint (basic knowledge required).
- Build and optimize MS SQL database structures, queries, and stored procedures.
- Collaborate with product owners, UX/UI designers, and other developers to deliver high-quality software solutions.
- Manage CI/CD pipelines and source control using Azure DevOps.
- Participate in code reviews, technical planning sessions, and architecture discussions.
- Troubleshoot, debug, and optimize application performance.
- Follow best practices in security, scalability, and maintainability.
Required Skills & Experience
- 10+ years of professional software development experience.
- Active Top Secret Required /SCI (or Eligible)
- Bachelor's in IT, Cybersecurity, Computer Science, Information Systems, Data Science, or Software Engineering OR Active CSSLP, GSEC, or CISSP-ISSAP
- Strong proficiency in C#, .NET Core, and Entity Framework Core.
- Experience with ReactJS and modern front-end workflows (including Vite).
- Solid understanding of MS SQL Server and relational database design.
- Familiarity with SharePoint development and integration (basic level).
- Proficiency with Azure DevOps, Git, and CI/CD pipelines.
- Proficiency using Visual Studio and/or Visual Studio Code.
- Strong problem-solving skills and the ability to work in a fast-paced, collaborative environment.
Nice to Have
- Experience with Azure Cloud services.
- Familiarity with containerization (Docker, Kubernetes).
- Knowledge of modern authentication protocols (e.g., OAuth, OpenID Connect).
At Leidos, we don’t want someone who "fits the mold"—we want someone who melts it down and builds something better. This is a role for the restless, the over-caffeinated, the ones who ask, “what’s next?” before the dust settles on “what’s now.”
If you’re already scheming step 20 while everyone else is still debating step 2… good. You’ll fit right in.
Original Posting:October 29, 2025For 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.
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.
Top Skills
What We Do
We Are Leidos
For 50 years we have been tackling some of the biggest problems that face our nation and our world.
OUR MISSION
Through our culture of innovation and history of performance, we develop deep customer trust built on integrity and create enduring solutions that improve our world. Leidos is a science and technology solutions leader working to address some of the world’s toughest challenges in the defense, intelligence, homeland security, civil, and healthcare markets. The company’s 43,000 employees support vital missions for government and commercial customers. Headquartered in Reston, Va., Leidos reported annual revenues of approximately $11.09 billion for the fiscal year ended January 3, 2020.
Leidos was cited for the meaningful work employees perform that is challenging, impactful, and aligned with our customers’ missions as reasons professionals want to work and stay at our company. Leidos has also been named to lists including Forbes’ Best Employers for Diversity, Forbes’ America’s Best Employers for Women, Military Times Best for Vets Employers, and Ethisphere Institute’s World's Most Ethical Companies®.
Employees enjoy career enrichment opportunities available through mobility and development and experience rewarding relationships with supportive supervisors and talented colleagues and customers. Employees appreciate our flexible work environment, allowing for and encouraging a true work-life balance. Our professionals are also excited about our Employee Resource Groups, like the newly launched Collaborative Outreach with Remote and Embedded Employees (CORE), which strives to create an environment where every employee, regardless of location, feels fully engaged as a valued employee of Leidos.
Your most important work is ahead.
