Mid-level Full Stack Developer; Typescript

Position: Mid-level Full Stack Developer (Typescript)
** Description*
* 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/Type Script 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/Type Script 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
** Git Hub Flow
** branching strategies and
** Git Ops
* * practices for reliable, traceable deployments.

+ Leverage
** Git Hub Copilot
** to accelerate development while maintaining code quality and ownership.

+ Use
** Git Hub Code spaces
** for consistent, cloud-based development environments across the team.

+ Integrate and act on findings from
** Git Hub 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 (Postgre

SQL, MySQL) and/or No

SQL (Mongo

DB, 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** (Git Hub 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 Type Script
** 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 (Postgre

SQL or MySQL).

+

Experience with
** Git
* * and
** Git Hub Flow
** workflows on Git Hub.

+ 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
** Git Hub Actions
** and applying
** Git Ops
* * principles.

+ Practical use of
** Git Hub Copilot
** in day-to-day development.

+ Experience working in
** Git Hub Code spaces
** or similar cloud development environments.

+ Familiarity with
** Git Hub Advanced Security** (CodeQL, secret scanning, Dependabot alerts).

+ Exposure to
** No

SQL databases** (Mongo

DB, Dynamo

DB, 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, 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…