Explore 4 react developer jobs from 3 hiring companies in Nassau, DE, US. Filter by remote, salary, experience, and company, then open any listing to apply.

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React Developer Jobs

Peraton

Booz Allen

Eccalon

Onsite

Hybrid

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Software Engineer (Front-End / React)Location: Laurel, MD Clearance: Active TS/SCI with Polygraph RequiredShape Mission-Critical User ExperiencesJoin a high-impact, mission-driven team supporting a mature and evolving software development program within the Intelligence Community. As a Front-End Software Engineer, you will play a key role in enhancing CAMKey, a mission-critical enterprise service relied upon across multiple systems and users. This is an opportunity to work on highly visible applications where performance, usability, and scalability directly support national security objectives. What You’ll Do<ul style="margin-top: 0in;"><li>Design and develop modern, responsive user interfaces for mission-critical applications </li><li>Build and maintain front-end components using React and modern JavaScript frameworks </li><li>Collaborate with back-end engineers, system architects, and mission stakeholders to deliver seamless user experiences </li><li>Contribute to UI/UX improvements that enhance usability across enterprise systems </li><li>Participate in code reviews, testing, and continuous improvement of development practices </li><li>Support the evolution of a mature codebase while introducing modern front-end best practices </li></ul> #MDFSP

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Required Qualifications<ul style="margin-top: 0in;"><li>Fourteen (14) years of experience as a Software Engineer (SWE) </li><li>Bachelor’s degree in Computer Science, Mathematics, Engineering, Statistics, Engineering Management, or a related field </li><ul style="margin-top: 0in;"><li>Four (4) additional years of SWE experience may be substituted in lieu of a degree</li></ul><li>Hands-on experience developing front-end applications using React </li><li>Strong proficiency in JavaScript </li><li>Active TS/SCI clearance with a current polygraph </li></ul> Preferred Qualifications<ul style="margin-top: 0in;"><li>Experience with Redux or similar state management libraries </li><li>Familiarity with advanced React concepts (e.g., hooks, context, performance optimization) </li><li>Experience developing with TypeScript </li><li>Exposure to modern UI/UX best practices and component-based architecture</li></ul> Why Join PeratonThis critical National Security role is eligible for Peraton’s premier benefits package, designed to recognize and support the professionals safeguarding our nation:<ul style="margin-top: 0in;"><li>Heavily subsidized health and wellness coverage for you and your dependents</li><li>25 days of PTO accrued annually</li><li>5% Annual Critical Skills Payment</li></ul>Join an elite team where your work directly impacts national security while enjoying top-tier benefits and recognition. #AJCM#PeratonRoyalMove

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Peraton is a next-generation national security company that drives missions of consequence spanning the globe and extending to the farthest reaches of the galaxy. As the world’s leading mission capability integrator and transformative enterprise IT provider, we deliver trusted, highly differentiated solutions and technologies to protect our nation and allies. Peraton operates at the critical nexus between traditional and nontraditional threats across all domains: land, sea, space, air, and cyberspace. The company serves as a valued partner to essential government agencies and supports every branch of the U.S. armed forces. Each day, our employees do the can’t be done by solving the most daunting challenges facing our customers. Visit <a href="http://peraton.com/" target="_blank" rel="noopener">peraton.com</a> to learn how we’re keeping people around the world safe and secure.

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$146,000 - $234,000. This represents the typical salary range for this position. Salary is determined by various factors, including but not limited to, the scope and responsibilities of the position, the individual’s experience, education, knowledge, skills, and competencies, as well as geographic location and business and contract considerations. Depending on the position, employees may be eligible for overtime, shift differential, and a discretionary bonus in addition to base pay.

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EEO: Equal opportunity employer, including disability and protected veterans, or other characteristics protected by law.

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Software Engineer(Front-End/React), Senior Advisor

Software Engineer

14+ years SWE experience; BS in CS/Engineering/Math/Statistics; strong React and JavaScript; active TS/SCI with poly; front-end development

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Cloud Software Engineer 2 – Cyber Mission (Annapolis Junction, MD)Peraton is seeking a Cloud Software Engineer 2 to support our Cyber Mission business unit in Annapolis Junction, MD. This role supports mission-critical platforms that automate complex processes, enabling customers to focus on advanced analytical challenges. You will work within an Agile team leveraging DevOps principles to deliver secure, scalable, and reliable cloud-based software solutions. This position is performed at a contractor facility with telework flexibility based on tasking and customer approval. What You’ll Do<ul><li>Develop, test, and maintain full-stack cloud-based applications </li><li>Support integration, troubleshooting, and system enhancements </li><li>Collaborate in Agile teams to deliver high-quality software </li><li>Contribute to CI/CD pipelines and automated deployments </li><li>Work with containerized applications in cloud environments</li></ul>Technical Requirements <ul style="margin-top: 0in;"><li>Full-stack development (Java / JavaScript) </li><li>Java, Spring, JUnit </li><li>JavaScript frameworks (React or Vue.js) </li><li>JSON / REST services </li><li>ElasticSearch / ELK </li><li>Redis and MongoDB familiarity </li><li>Docker </li><li>Kubernetes or Docker Swarm </li><li>AWS cloud services </li><li>Git / GitLab </li><li>CI/CD tools (GitLab CI/CD or Jenkins)</li></ul>Benefits:Peraton offers enhanced benefits to employees working on our critical programs, which include heavily subsidized employee benefits coverage for you and your dependents, 25 days of PTO accrued annually up to a generous PTO cap and eligibility to participate in an attractive bonus plan. #MPOJobs #AJCM #PeratonRoyalMove  #MDFSP

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Active TS/SCI clearance with current polygraph Minimum experience requirement (one of the following):<ul style="margin-top: 0in;"><li>3 years of software development/engineering experience with a Bachelor’s degree (BS/BA) in Computer Science or related technical field; 1 year of experience with qualifying Masters degree</li><li>6 years of software development/engineering experience with no degree</li></ul>Experience must include: requirements analysis, software development, integration, testing, and troubleshootingOne of the following Cloud Certifications (required and will be verified during the interview or offer process): <ul style="margin-top: 0in;"><li>AWS Certified Developer – Associate</li><li>AWS DevOps Engineer – Professional</li><li>Certified Kubernetes Application Developer (CKAD)</li></ul> 

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Peraton is a next-generation national security company that drives missions of consequence spanning the globe and extending to the farthest reaches of the galaxy. As the world’s leading mission capability integrator and transformative enterprise IT provider, we deliver trusted, highly differentiated solutions and technologies to protect our nation and allies. Peraton operates at the critical nexus between traditional and nontraditional threats across all domains: land, sea, space, air, and cyberspace. The company serves as a valued partner to essential government agencies and supports every branch of the U.S. armed forces. Each day, our employees do the can’t be done by solving the most daunting challenges facing our customers. Visit <a href="http://peraton.com/" target="_blank" rel="noopener">peraton.com</a> to learn how we’re keeping people around the world safe and secure.

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$112,000 - $179,000. This represents the typical salary range for this position. Salary is determined by various factors, including but not limited to, the scope and responsibilities of the position, the individual’s experience, education, knowledge, skills, and competencies, as well as geographic location and business and contract considerations. Depending on the position, employees may be eligible for overtime, shift differential, and a discretionary bonus in addition to base pay.

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EEO: Equal opportunity employer, including disability and protected veterans, or other characteristics protected by law.

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Cloud Software Engineer 2 - TS/SCI w/Poly

Cloud Software Engineer

Full-stack cloud development with Java/JavaScript, containerization, and cloud services; TS/SCI with Poly clearance; agile/DevOps experience.

Full Stack Developer 

Location: Hanover, MD- On-site

Type: Full-time

Clearance: No Clearance Required

Job Description

Eccalon is seeking a Full Stack Developer to design, build, and ship production software across a portfolio of DoD, Intelligence, and enterprise programs. You will own features end-to-end&mdash;from React front-ends and Next.js applications through Node.js/Python APIs and AWS-hosted data stores&mdash;and actively leverage LLM and AI-assisted development techniques to accelerate delivery and enhance product capabilities. You will work closely with cross-functional teams including DevOps, UX/UI design, and program leadership in a security-conscious, compliance-driven environment.

Responsibilities

<ul>
	<li>Design, develop, and maintain full-stack web applications from UI through API to data layer, with ownership of features across the entire delivery lifecycle.</li>
	<li>Build front-end architecture and UI components using React and Next.js; create reusable component libraries that support consistent UX across multiple products.</li>
	<li>Integrate LLM and AI capabilities into product features using the Anthropic API (Claude) and other model providers; apply prompt engineering, retrieval-augmented generation (RAG), and agentic workflow patterns to build intelligent, context-aware application experiences.</li>
	<li>Translate designs and wireframes into high-quality, accessible, responsive code; leverage AI-assisted development tools (e.g., Claude Code) to accelerate implementation without sacrificing quality or security.</li>
	<li>Develop and maintain back-end services and REST APIs using Node.js and Python; design for security, scalability, and compliance from the start.</li>
	<li>Integrate front-end applications with back-end APIs and AWS cloud services (Cognito, Lambda, API Gateway, DynamoDB, RDS/PostgreSQL); implement authentication flows including OAuth2/OIDC and JIT provisioning.</li>
	<li>Implement security and data protection measures aligned to NIST 800-171 and CMMC requirements; apply OWASP Top 10 mitigations and participate in code-level security reviews.</li>
	<li>Implement responsive, accessible UI designs (WCAG 2.1) that render consistently across devices and browsers.</li>
	<li>Write clean, well-tested, and well-documented code; contribute to and enforce engineering standards through trunk-based development and peer code review.</li>
	<li>Conduct thorough code reviews with a focus on security, maintainability, and AI-generated code validation; mentor junior engineers on best practices.</li>
	<li>Troubleshoot and debug complex issues across the full stack, including integration points with LLM APIs, cloud services, and third-party authentication providers.</li>
	<li>Design and manage relational and NoSQL data models across PostgreSQL, DynamoDB, and MongoDB; optimize queries and data access patterns for performance and cost.</li>
	<li>Apply structured prompt engineering techniques&mdash;chain-of-thought, few-shot examples, tool use, and system prompt design&mdash;to build reliable, production-ready LLM-powered features; evaluate and mitigate prompt injection, hallucination, and data leakage risks.</li>
	<li>Partner with UX/UI designers, product managers, and DevOps to deliver features end-to-end; translate program requirements into scalable technical solutions.</li>
	<li>Stay current on advancements in LLM/AI tooling, web frameworks, and cloud-native development; bring new techniques back to the team through demos, documentation, and knowledge sharing.</li>
</ul>

Required Qualifications

&nbsp;

<ul>
	<li>Bachelor&rsquo;s degree in Computer Science, or a related field (or equivalent work experience).</li>
	<li>3+ years of experience as a Full Stack Developer shipping production web applications; experience in a DoD, federal contracting, or regulated environment a plus.</li>
	<li>Strong proficiency in HTML5, CSS3, JavaScript/TypeScript (ES6+), React, and Next.js; comfort building and documenting reusable component libraries.</li>
	<li>Proficiency in Node.js and Python for server-side development; experience with Express.js, Nest.js, and/or Next.js API routes.</li>
	<li>Hands-on experience integrating LLM APIs (Anthropic Claude, OpenAI, or similar) into production applications; demonstrated ability to write effective prompts, implement RAG pipelines, and build tool-use/agentic workflows.</li>
	<li>Experience with relational databases (PostgreSQL) and NoSQL databases (DynamoDB); comfort writing and optimizing queries and managing schema migrations.</li>
	<li>Solid understanding of RESTful API design, microservices architecture, and AWS services (API Gateway, Lambda, Cognito, S3, CloudFront).</li>
	<li>Proficiency with Git and trunk-based development workflows; experience with GitHub or GitLab for PR-based collaboration.</li>
	<li>Working knowledge of CI/CD pipelines (GitLab CI/CD) and cloud deployment practices on AWS; familiarity with security-focused DevSecOps gates.</li>
	<li>Strong analytical and problem-solving skills; ability to work independently across multiple concurrent projects and communicate technical decisions clearly to non-technical stakeholders.</li>
	<li>Comfort working in a regulated, compliance-aware environment; familiarity with NIST 800-171, CMMC, or FedRAMP requirements preferred.</li>
	<li>Strong interpersonal and communication skills; proven ability to collaborate effectively across engineering, design, DevOps, and program management teams.</li>
</ul>

Preferred Qualifications

<ul>
	<li>Experience building AI-powered features using RAG, vector databases (e.g., pgvector, Pinecone), or LLM orchestration frameworks (e.g., LangChain, LlamaIndex).</li>
	<li>Familiarity with model context protocol (MCP) patterns and structured tool-use design for LLM-integrated applications.</li>
	<li>Experience with Azure services (Azure AD, GCC High) or AWS GovCloud in a DoD or federal contracting environment.</li>
	<li>Familiarity with TypeScript across both front-end and back-end (Node.js/Next.js) codebases.</li>
	<li>Experience with Playwright or Cypress for end-to-end testing of web applications.</li>
	<li>Background in UX/UI collaboration with Figma or similar design tooling.</li>
</ul>

Equal Employment Opportunity (EEO) Policy

Eccalon provides equal employment opportunities to all employees and applicants for employment and prohibits discrimination and harassment of any type without regard to race, color, religion, age, sex, national origin, disability status, genetics, protected veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by federal, state, or local laws. This policy applies to all terms and conditions of employment, including recruiting, hiring, placement, promotion, termination, layoff, recall, transfer, leaves of absence, compensation, and training.

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Full Stack Developer   (MD, Hanover)

Full Stack Developer

3+ years as a full stack developer; React/Next.js; Node.js/Python; DoD/regulatory experience a plus; AI/LLM integration experience.

Full Stack Software Engineer, SeniorThe Opportunity:
As a full stack developer, you can resolve a problem with a complete end-to-end solution in a fast, agile environment. If you’re looking for the chance to not just develop software, but to create a system that will make a difference, we need you on our team. We’re looking for an experienced developer like you with the skills needed to develop software and systems from vision to production-ready. 

This role is more than just coding. As a senior full stack developer at Booz Allen, you’ll use your passion to master new tools and techniques and identify needed system improvements. You’ll help clients overcome their most difficult challenges using the latest architectural approaches, tools, and technologies. You’ll make sure the solution developed by the team considers the current architecture and operating environment, as well as future functionality and enhancements.  

Work with us as we shape systems for the better.  

Join us. The world can’t wait. 

You Have: 
5+ years of experience designing, modifying, developing, writing, and implementing software programming applications using Agile methods

5+ years of experience in software development with basic programming languages, technologies, tools, workflows, site maintenance, APIs, or web development stacks, including Python, React, and FastAPI

Experience with containerization and orchestrating deployments in Docker

Experience developing and testing interfaces between software products and products of other vendors

Experience writing source code for new applications or generating and enhancing code samples for existing applications

Experience using back-end and front-end languages to develop complete solutions 

Experience managing software solutions developed, tested, and deployed on multiple OS variants, including UNIX or Linux

Ability to debug, troubleshoot, monitor, and maintain the operation of application code

TS/SCI clearance

Bachelor's degree or 8+ years of experience in software engineering in lieu of a degree

Nice If You Have: 
Experience acquiring client requirements and resolving workflow problems through automation optimization 

Experience with advanced software development, analytic development, and DevOps techniques for creating Pipeline APIs

Ability to work with automated testing tools to perform testing and maintenance 

Possession of excellent analytical and problem-solving skills

TS/SCI clearance

Master’s degree

Clearance: 
Applicants selected will be subject to a security investigation and may need to meet eligibility requirements for access to classified information; TS/SCI clearance is required.

Compensation
At Booz Allen, we celebrate your contributions, provide you with opportunities and choices, and support your total well-being. Our offerings include health, life, disability, financial, and retirement benefits, as well as paid leave, professional development, tuition assistance, work-life programs, and dependent care. Our recognition awards program acknowledges employees for exceptional performance and superior demonstration of our values. Full-time and part-time employees working at least 20 hours a week on a regular basis are eligible to participate in Booz Allen’s benefit programs. Individuals that do not meet the threshold are only eligible for select offerings, not inclusive of health benefits. We encourage you to learn more about our total benefits by visiting the Resource page on our Careers site and reviewing Our Employee Benefits page.

Salary at Booz Allen is determined by various factors, including but not limited to location, the individual’s particular combination of education, knowledge, skills, competencies, and experience, as well as contract-specific affordability and organizational requirements. The projected compensation range for this position is $86,900.00 to $198,000.00 (annualized USD). The estimate displayed represents the typical salary range for this position and is just one component of Booz Allen’s total compensation package for employees. This posting will close within 90 days from the Posting Date.
Identity Statement
As part of the application process, you are expected to be on camera during interviews and assessments. We reserve the right to take your picture to verify your identity and prevent fraud.

Work Model
Our people-first culture prioritizes the benefits of flexibility and collaboration, whether that happens in person or remotely.
If this position is listed as remote or hybrid, you’ll periodically work from a Booz Allen or client site facility.
If this position is listed as onsite, you’ll work with colleagues and clients in person, as needed for the specific role.

Commitment to Non-Discrimination
All qualified applicants will receive consideration for employment without regard to disability, status as a protected veteran or any other status protected by applicable federal, state, local, or international law.

Full Stack Software Engineer, Senior

Senior full stack engineer with 5+ years' experience, Python/React/FastAPI, Docker, Agile, TS/SCI clearable, and degree or equivalent experience.

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