We are seeking a talented and motivated Mid-Level Full Stack Developer to join our engineering team. In this role, you will design, develop, and maintain end-to-end web applications using modern JavaScript/TypeScript technologies across the stack. You will collaborate closely with product managers, designers, and fellow engineers to deliver scalable, high-quality, visually polished software that delivers real value to our users.
Candidate MUST:
Be a U.S. citizen or Green Card holder (Permanent Resident) who is currently located in the United States for the current three consecutive years, with the Ability to obtain a level 4 Public Trust Clearance.
*Preference for candidates who are local to the Washington, DC, VA and MD areas.
Key Responsibilities
Design, develop, test, and deploy full-stack web applications using modern JavaScript/TypeScript frameworks (React, Angular, Node.js) across the frontend and backend.
Build and maintain RESTful APIs and serverless/microservice components that are secure, performant, and well-documented.
Develop responsive, user-friendly, and visually compelling interfaces following UX/UI best practices and accessibility standards (Section 508 compliance).
Build and maintain Azure Static Web Apps and integrate with headless CMS platforms (e.g., Payload, Contentful, Strapi, Sanity, Sitecore, or similar) to power content-driven experiences.
Implement and follow GitHub Flow branching strategies and GitOps practices for reliable, traceable deployments.
Leverage GitHub Copilot to accelerate development while maintaining code quality and ownership.
Use GitHub Codespaces for consistent, cloud-based development environments across the team.
Integrate and act on findings from GitHub Advanced Security (CodeQL, secret scanning, Dependabot) to keep applications secure by default.
Participate in code reviews, providing constructive feedback and learning from peers.
Work with relational (PostgreSQL, MySQL) and/or NoSQL (MongoDB, Redis) databases — designing schemas, writing efficient queries, and optimizing performance.
Collaborate in an Agile/Scrum environment, contributing to sprint planning, stand-ups, and retrospectives.
Troubleshoot, debug, and resolve production issues across the full stack.
Contribute to CI/CD pipelines (GitHub Actions) and participate in deployment activities.
Mentor junior developers and share knowledge through documentation and tech talks.
Required Qualifications
Bachelor's degree in Computer Science, Software Engineering, or a related field (or equivalent practical experience).
Minimum of 4 years of professional software development experience.
Strong proficiency in JavaScript (ES6+) and TypeScript across both frontend and backend (Node.js).
Hands-on experience with at least one modern frontend framework: React or Angular.
Solid understanding of HTML5, CSS3, and modern responsive design techniques.
Design-heavy experience with a portfolio of public-facing sites that demonstrates strong visual design sensibility, attention to detail, and user-centered thinking.
Experience designing and consuming RESTful APIs; familiarity with JSON and HTTP standards.
Proficiency with SQL and experience with relational databases (PostgreSQL or MySQL).
Experience with Git and GitHub Flow workflows on GitHub.
Understanding of Agile methodologies and tools (Jira, Confluence).
Highly Preferred Qualifications
Experience building and deploying Azure Static Web Apps.
Hands-on experience with a headless CMS (Contentful, Strapi, Sanity, Sitecore, or similar).
Familiarity with Azure cloud services.
Experience with CI/CD using GitHub Actions and applying GitOps principles.
Practical use of GitHub Copilot in day-to-day development.
Experience working in GitHub Codespaces or similar cloud development environments.
Familiarity with GitHub Advanced Security (CodeQL, secret scanning, Dependabot alerts).
Exposure to NoSQL databases (MongoDB, DynamoDB, Redis).
Familiarity with infrastructure-as-code (Bicep, Terraform, or ARM templates).
Experience with accessibility testing tools and remediation for Section 508 / WCAG 2.1 AA compliance.
phhs
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:June 11, 2026For 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.
Skills Required
- Be a U.S. citizen or Green Card holder and have been located in the United States for the past three consecutive years
- Ability to obtain a level 4 Public Trust Clearance
- Bachelor's degree in Computer Science, Software Engineering, or related field (or equivalent practical experience)
- Minimum of 4 years of professional software development experience
- Strong proficiency in JavaScript (ES6+) and TypeScript across frontend and backend (Node.js)
- Hands-on experience with at least one modern frontend framework: React or Angular
- Solid understanding of HTML5, CSS3, and modern responsive design techniques
- Design-heavy experience with a portfolio of public-facing sites demonstrating visual design sensibility
- Experience designing and consuming RESTful APIs; familiarity with JSON and HTTP standards
- Proficiency with SQL and experience with relational databases (PostgreSQL or MySQL)
- Experience with Git and GitHub Flow workflows
- Understanding of Agile methodologies and tools (Jira, Confluence)
- Experience building and deploying Azure Static Web Apps
- Hands-on experience with a headless CMS (Contentful, Strapi, Sanity, Sitecore, or similar)
- Familiarity with Azure cloud services
- Experience with CI/CD using GitHub Actions and applying GitOps principles
- Practical use of GitHub Copilot in day-to-day development
- Experience working in GitHub Codespaces or similar cloud development environments
- Familiarity with GitHub Advanced Security (CodeQL, secret scanning, Dependabot)
- Exposure to NoSQL databases (MongoDB, DynamoDB, Redis)
- Familiarity with infrastructure-as-code (Bicep, Terraform, or ARM templates)
- Experience with accessibility testing tools and remediation for Section 508 / WCAG 2.1 AA
Leidos Compensation & Benefits Highlights
The following summarizes recurring compensation and benefits themes identified from responses generated by popular LLMs to common candidate questions about Leidos and has not been reviewed or approved by Leidos.
-
Healthcare Strength — Healthcare coverage is described as comprehensive, with multiple plan options, low office-visit copays in some plans, and access to mental health and wellness support tools. The availability of HSA/FSA options and employer contributions is positioned as a meaningful part of the total package.
-
Retirement Support — Retirement benefits are framed as a strong component of total rewards, highlighted by a 401(k) match and immediate vesting in the standard package. The Employee Stock Purchase Plan is also presented as an additional long-term wealth-building feature.
-
Wellbeing & Lifestyle Benefits — Wellbeing and lifestyle supports extend beyond core insurance, including wellness programs, fitness-related stipends, and assistance resources. Work flexibility and related perks are also included as part of the broader rewards experience.
Leidos Insights
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.
