Senior React.js Developer
Cquent Systems, Inc.Role Overview
Cquent Systems, Inc. is hiring a Senior React.js Developer. This is a contract hybrid role, based in Ashburn. Part of Cquent Systems, Inc.'s Lifecycle hiring. Full responsibilities, required qualifications, and the apply link are listed in the description below.
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Job Description
WORK ENVIRONMENT & CLEARANCE DETAILS
On-Site Requirement
5 days per week at the Ashburn, VA facility. No hybrid or remote options available. Proximity to site strongly preferred.
Security Clearance Process
Must be eligible for and willing to undergo a DHS suitability investigation. Offer of employment contingent upon successful clearance adjudication. Candidates with existing active clearance will be given priority.
Senior React.js Developer to join a mission-critical engineering team supporting the Client. The successful candidate will architect, build, and optimize high-performance web applications that directly support national security operations. This is a hands-on senior IC role demanding deep mastery of modern React patterns, a security-first engineering mindset, and proven experience delivering complex front-end systems in regulated or government environments.
CORE RESPONSIBILITIES
SHAPE \* MERGEFORMAT
▸ Architect and lead development of complex, large-scale React.js applications serving high-availability government workflows
- Design component libraries, micro-frontend architectures, and shared design systems
- Own performance budgets and drive continuous optimization across the full rendering lifecycle
▸ Write production-grade, rigorously tested code following federal secure development lifecycle
(SDLC) standards
- Unit, integration, and end-to-end testing with Jest, React Testing Library, and Cypress
- Enforce WCAG 2.1 AA accessibility compliance across all UI surfaces
▸ Collaborate closely with UX designers, backend engineers, and product owners in an
Agile/SAFe environment to translate requirements into exceptional user experiences
▸ Lead technical design reviews, code reviews, and architecture decisions; mentor junior and mid-level developers
▸ Lead technical design reviews, code reviews, and architecture decisions; mentor junior and mid-level developers
▸ Integrate with RESTful APIs and GraphQL endpoints; partner with backend teams on API contract design
▸ Manage application state at enterprise scale using Redux Toolkit, Zustand, or equivalent modern state management solutions
▸ Ensure security compliance with DHS/FISMA requirements including input validation, XSS mitigation, CSP, and OWASP Top 10 hardening
▸ Participate in sprint ceremonies, contribute to estimation, and proactively surface technical risks and dependencies
▸ Support CI/CD pipeline configuration and front-end build tooling (Webpack, Vite, or equivalent)
REQUIRED QUALIFICATIONS
SHAPE \* MERGEFORMAT
Experience & Education
▸ 8+ years of professional software development experience; 5+ years with React.js in production environments
▸ Bachelor''s degree in Computer Science, Software Engineering, or equivalent technical discipline (or equivalent hands-on experience)
▸ Demonstrated history delivering enterprise-scale front-end applications in federal, defense, or highly regulated industry settings
Technical Depth — React & Front-End
▸ Expert-level command of React.js including Hooks, Context API, concurrent features
(Suspense, transitions), and the virtual DOM reconciliation model
▸ Deep mastery of JavaScript (ES2022+) and TypeScript; able to define advanced generic types, mapped types, and conditional types
▸ Proficiency with modern state management: Redux / Redux Toolkit, React Query / TanStack Query, Zustand, or Recoil
▸ Experience with component-driven development using Storybook and shared design systems
Strong CSS / SCSS skills; proficiency with Tailwind CSS, CSS Modules, or styledcomponents
▸ Build tooling expertise: Webpack (custom config), Vite, Babel, and module bundler optimization (code-splitting, tree-shaking, lazy loading)
▸ Solid understanding of browser internals: event loop, rendering pipeline, Web APIs, and performance profiling via Chrome DevTools / Lighthouse.
Security & Compliance
▸ Working knowledge of FISMA, NIST 800-53, and FedRAMP control requirements as they apply to front-end development
▸ Applied experience implementing OWASP Top 10 mitigations, Content Security Policy, and secure authentication patterns (OAuth 2.0, SAML, OIDC)
▸ Understanding of Section 508 / WCAG 2.1 AA requirements and the ability to conduct accessibility audits
Tooling & Collaboration
▸ Git-based version control with a strong branching / code review discipline (GitHub, GitLab, or Bitbucket)
▸ CI/CD experience with Jenkins, GitHub Actions, GitLab CI, or Azure DevOps
▸ Agile/Scrum or SAFe methodology experience; proficiency with Jira and Confluence
▸ Clear, precise written and verbal communication; able to articulate technical concepts to nontechnical stakeholders
PREFERRED QUALIFICATIONS
SHAPE \* MERGEFORMAT
▸ Active DHS, DOD, or IC security clearance
▸ Experience with Next.js or Remix for server-side rendering and edge-deployed front ends
▸ GraphQL client-side experience (Apollo Client, URQL)
▸ Familiarity with micro-frontend architecture using Module Federation
▸ Exposure to containerization (Docker) and Kubernetes for front-end deployment workflows
▸ Prior experience on DHS, CBP, CISA, TSA, or similar federal agency programs
▸ Certifications: AWS Certified Developer, Google Cloud Professional Developer, or equivalent
▸ Contributions to open-source projects or published technical writing
Frequently Asked Questions
How do I apply for the Senior React.js Developer position at Cquent Systems, Inc.?
Use the Apply button above to submit your application directly to Cquent Systems, Inc.. Most applications take less than 5 minutes if your resume and contact details are ready, and you'll be routed to the employer's official application system to finish.
Is the Senior React.js Developer role at Cquent Systems, Inc. remote or in-office?
This is a hybrid role based in Ashburn. Expect a mix of in-office and remote days, with the specific cadence set by the hiring manager.
What does a Senior React.js Developer at Cquent Systems, Inc. earn?
Cquent Systems, Inc. has not disclosed a salary range in this posting. Many employers share specifics later in the interview process; you can also ask during a recruiter screen if compensation transparency is important to you.
When was the Senior React.js Developer role at Cquent Systems, Inc. posted?
This role was posted on April 20, 2026 (49 days ago). It's still listed as actively hiring; we re-confirm openings against the source system multiple times per day and remove closed roles.
How much experience does the Senior React.js Developer role at Cquent Systems, Inc. require?
This is a senior-level position. Most senior roles call for 5+ years of directly relevant experience. Cquent Systems, Inc. lists their specific requirements in the description below, so review the must-have qualifications closely before applying.
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