Full Stack Developer with Security Clearance

VTG; Fairfax (VA); On-site; USD 120,000 - 170,000; Full time

Job summary

VTG is seeking an experienced Full Stack Software Engineer to design, develop, integrate, and maintain modern web applications and AI-enabled capabilities. You will support scalable LLM-powered solutions, RAG pipelines, Elasticsearch search, RESTful APIs, and React-based user interfaces in an Agile environment.

You will design and implement frontend and backend services with React, Node.js, and Express.js, and work with AWS, IAM, and security considerations.

Qualifications

• Experience building and integrating LLM-based applications (RAG, semantic search, AI-assisted information retrieval).
• Strong frontend development using React, HTML5, CSS3, and modern JavaScript.
• Backend API design with Node.js and Express.js; RESTful services and security basics.
• Hands-on Elasticsearch design, indexing, query tuning, and cluster scaling.
• Experience with data ingestion, embeddings, vector retrieval, and hybrid search pipelines.
• Proficient in AWS cloud environments, DevOps practices, and CI/CD tooling.

Responsibilities

• Design, develop, modify, test, and maintain scalable web applications and systems.
• Develop LLM-powered capabilities and RAG pipelines for AI-enabled features.
• Implement scalable search and information retrieval using Elasticsearch.
• Build data pipelines for hybrid search (BM25 and vector-based retrieval).
• Create SPAs with React and backend services with Node.js/Express.js.
• Collaborate across teams in Lean Agile ceremonies and ensure code quality.

Skills

React

JavaScript

RESTful APIs

Node.js

Express.js

Elasticsearch

RAG

Semantic search

AWS

CI/CD

Agile

Git

Jenkins

Nexus

Tools

Git

Jenkins

Nexus

Apache Tomcat

Job description

Overview We are seeking an experienced Full Stack Software Engineer to design, develop, integrate, and maintain modern web applications and AI-enabled capabilities. This role will support the development of scalable LLM-powered solutions, Retrieval-Augmented Generation (RAG) pipelines, Elasticsearch search capabilities, RESTful APIs, and React-based user interfaces within an Agile development environment. What will you do?

• Design, develop, modify, test, and maintain scalable software applications and systems.
• Develop and integrate LLM-powered capabilities, including Retrieval-Augmented Generation (RAG) solutions.
• Design and implement scalable search and information retrieval solutions using Elasticsearch.
• Build data pipelines supporting hybrid search, including BM25 and vector-based retrieval.
• Develop workflows for data ingestion, document chunking, embeddings, indexing, and vector retrieval.
• Design and develop responsive Single Page Applications (SPAs) using React, HTML5, CSS3, and modern JavaScript.
• Design and develop backend services and RESTful APIs using Node.js and Express.js or comparable technologies.
• Design system interfaces, integration points, data flows, and data exchange workflows.
• Translate customer and system requirements into actionable technical designs and software solutions.
• Perform unit testing, participate in code reviews, troubleshoot application issues, and maintain software quality.
• Support web and server technologies, including Apache Tomcat, Node.js, Web Services, and SSL/TLS.
• Develop and maintain solutions within approved cloud environments, including AWS.
• Participate in Lean Agile ceremonies, including scrums, sprint planning, backlog grooming, and other development activities.
• Collaborate with security, engineering, operations, testing, and other technical teams.
• Coordinate with stakeholders to resolve technical issues, clarify requirements, identify resource needs, and support project execution.
• Utilize Git, Jenkins, and Nexus to support source control, CI/CD, build, and deployment activities.
• Track vendor software roadmaps, releases, patches, and version updates.
• Develop and maintain appropriate technical and system documentation. Do you have what it takes?
• Active TS/SCI with Polygraph
• Demonstrated experience working within a Lean Agile software development environment.
• Experience translating customer and system requirements into detailed technical and design specifications.
• Strong experience designing system interfaces, integration points, data flows, and data exchange workflows.
• Hands-on experience building or integrating LLM-based applications, including:
• Retrieval-Augmented Generation (RAG)
• Semantic search
• AI-assisted information retrieval
• Experience designing and implementing hybrid search pipelines combining BM25 and vector search.
• Experience with data ingestion, document chunking, embeddings, vector retrieval, and RAG workflows.
• Strong experience with Elasticsearch, including index design and optimization, query development, relevance tuning, and cluster scaling.
• Hands‑on front‑end development experience using:
• React, including Hooks
• HTML5
• CSS3
• JavaScript
• Hands‑on backend development experience designing and developing RESTful APIs using Node.js and Express.js or comparable backend technologies.
• Experience troubleshooting web protocols and server technologies, including Apache Tomcat, Node.js, Web Services, and SSL/TLS configurations.
• Experience with modern JavaScript testing frameworks such as Jest or Karma.
• Experience with DevOps and software development tools including Git, Jenkins, and Nexus.
• Experience developing or supporting applications within cloud environments such as AWS.
• Strong analytical, troubleshooting, communication, and collaboration skills.