Job Description

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 TS/SCI (or Eligible)
• Bachelors 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, 2025
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: Pay Range $89,700.00 - $162,150.00
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.

Skills Required