The Defense Sector at Leidos is currently hiring a Junior Software Developer to build and sustain mission-focused web applications for defense customers. You’ll contribute across the stack with .NET, Vue.js, and SQL Server, writing secure, maintainable code that can operate in constrained or disconnected environments. You’ll work within disciplined SDLC and configuration management processes, collaborating with senior engineers to deliver capabilities that support real end users in the field.
Job Responsibilities
- Full-stack development: Implement backend services in C# (.NET/ASP.NET) and front-end features in Vue.js and Nuxt, integrating with SQL Server.
- Secure coding: Apply best practices, input validation, logging, and error handling aligned to audit requirements.
- Data and APIs: Build RESTful APIs, write T-SQL queries and stored procedures for reliability and performance.
- Team collaboration: Work with QA, and DevOps to meet SLAs, resolve defects, and support fielded systems.
Basic Qualifications
- Bachelor’s degree with 2+ years of experience of a Master’s degree with 1+ year of experience. Additional experience maybe considered in lieu of a degree.
- US Citizen with the ability to obtain a TS/SCI security clearance within 365 days of your hire date.
- Technical skills: Basic experience with C# (.NET/ASP.NET), JavaScript/TypeScript, Vue.js or similar framework, and SQL Server.
- Foundations: Understanding of REST, HTTP, JSON, and relational database design.
- Version control: Familiar with Git workflows and pull requests.
- Quality mindset: Writes readable, tested code; receptive to feedback and code reviews.
- Security awareness: Familiarity with secure coding concepts and least-privilege design.
Preferred Qualifications
- US Citizen with an active TS/SCI security clearance.
- Performance and testing: Experience with unit/integration testing and basic performance profiling.
- Pipelines: Exposure to CI/CD (Azure DevOps, GitLab CI, Jenkins) and work item tracking (Jira/Azure Boards).
- API integration: Experience consuming external services and handling auth flows (OAuth/JWT).
- UX fundamentals: Ability to build accessible, responsive UIs with component libraries and state management.
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:
April 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:
Pay Range $69,550.00 - $125,725.00
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.