Jr. React / JavaScript UI Developer

About Concept Plus
Concept Plus is a mission-focused technology solutions provider that transforms IT concepts into impactful solutions for federal agencies. Headquartered in Fairfax, VA, we bring the agility, responsiveness, and customer intimacy of a small business combined with the quality and infrastructure of a larger firm.

Recognized as an award-winning Oracle partner, we have delivered innovative solutions across Defense, Intelligence, Civilian, Health IT, and Tribal sectors. Our highly certified experts build systems that drive efficiency, accelerate modernization, and ensure mission outcomes with certainty.

We offer competitive pay, comprehensive health, dental, and vision insurance, paid life insurance, paid time off, 11 paid holidays, performance bonuses, tuition reimbursement, unlimited training, and the opportunity to thrive in a collaborative, flexible, and innovative environment.

For more information, visit www.conceptplus.com.

About the role

Concept Plus is seeking a Junior React/JavaScript UI Developer to support an enterprise-scale application operating in secure client environments, including Denied, Degraded, Intermittent, and Limited (DDIL) communication conditions. This role is ideal for developers with foundational experience in React, Vue, Node.js, Progressive Web Applications (PWAs), and Electron, who are eager to build modern UI capabilities under the mentorship of senior engineers. You will assist in developing, refining, and supporting user-facing features while contributing to Agile delivery, defect resolution, and integration activities across a multi-vendor environment.

What you'll do

• Assist in producing and updating UI checklists, front-end development guides, and best practice documentation.
• Develop and maintain UI components using React, including hooks, props, and functional components.
• Contribute to Vue component development and support dual-framework environments as directed by senior team members.
• Participate in building Progressive Web Applications (PWAs), including offline-first functionality aligned to DDIL requirements.
• Assist in developing Electron-based desktop application features and cross-platform UI modules.
• Implement basic Node.js scripts, UI build tooling and contribute to backend-for-frontend (BFF) patterns.
• Support state management implementations using Redux, Zustand, or React Query, with guidance from senior staff.
• Consume RESTful APIs and implement async workflows (Promises, async/await).
• Write and maintain unit and integration tests using Jest, React Testing Library, or Cypress.
• Develop responsive, accessible UI layouts using HTML5, CSS3, and modern CSS frameworks.
• Collaborate with UX/HCD teams to implement designs, wireframes, and user flows into functional UI components.
• Work within CI/CD pipelines using Git for version control (branching, PRs, code reviews).
• Apply secure development practices aligned with Zero Trust principles and CI/CD security gating.
• Support senior engineers in DevSecOps activities including pipeline testing and static/dynamic code scanning.
• Assist with security documentation and tasks related to Authority to Operate (ATO) requirements within federal environments.
• Participate in Agile ceremonies including stand-ups, sprint planning, reviews, and retrospectives.
• Provide Tier 1–2 support for UI defects, enhancements, and integration feedback.
• Collaborate with senior UI developers, backend developers, DevSecOps teams, and government stakeholders in a multi-vendor environment.

Required Qualifications

• US Citizen
• Ability to obtain and/or maintain a government clearance.
• 1–3 years of professional front-end development experience, including hands-on React development.
• Understanding of modern JavaScript (ES6+) and familiarity with Vue and/or Node.js.
• Exposure to PWAs or offline-first design principles.
• Experience writing basic unit or integration tests (Jest, Cypress, etc.).
• Understanding of TypeScript fundamentals and desire to grow into full proficiency.
• Familiarity with Git workflows and collaborative development practices.
• Strong communication skills and willingness to learn from senior engineers.
• Demonstrated ability to contribute in a fast-paced Agile environment.
• Strong problem-solving mindset and attention to detail.

Preferred Qualifications

• Experience with Electron or hybrid Web/Desktop application development.
• Exposure to Cloud One, AWS GovCloud, or other secure cloud environments.
• Experience supporting DoD, DHA, or OPMED systems such as OMDS, MedCOP, or MHS GENESIS.
• Familiarity with micro frontend concepts.
• Basic familiarity with GraphQL and Apollo Client.
• Contributions to open-source projects or a public portfolio (GitHub, GitLab, etc.)

Concept Plus is an Equal Opportunity Employer. As such, we will give your application full consideration without regard to your race, color, religion, sex, age, national origin, disability, veteran status, sexual orientation, gender identity, or any other classification protected by federal, state, or local law.