Software Engineer (TS/SCI) - AI, RAG, Elasticsearch

B4Corp; Chantilly (VA); On-site; USD 234,000 - 286,000; Full time

Benefits offered by this job

Full Vanguard 401k with employee match

Phantom stock program

Medical/Dental/Vision insurance

Short/Long-term disability insurance

7 weeks PTO + federal holidays

Referral bonus

Job summary

B4Corp seeks a Software Engineer in Chantilly, VA, to join an integrated team supporting U.S. intelligence and defense communities.

The role requires a TS/SCI clearance with polygraph, hands-on work across frontend, backend, and AI-enabled data pipelines, and collaboration with security, engineering, and testing teams. You will design, develop and test software systems, implement scalable search using Elasticsearch, and build LL-based capabilities including RAG pipelines in AWS cloud

Qualifications

• Lean Agile Development experience.
• Demonstrated experience translating customer and system requirements into actionable design specifications.
• Design system interfaces, including data flows and AI-assisted retrieval systems.
• Demonstrate experience building or integrating LL-based solutions, including RAG pipelines.
• Demonstrated experience designing and implementing data pipelines for hybrid search (BM25+ vector search) in REG workflows, covering injection, chunking, embeddings, and vector retrieval.
• Demonstrated experience with Elasticsearch, included index design and optimization, query development, relevance tuning and cluster scaling.
• Demonstrated hands-on experience in frontend Single Page Applications (SPA) development using React (hooks) HTML5, CSS3, and modern JavaScript best practices.
• Demonstrated hands-on experience in development, including designing and building RESTful APIs with Node.js or Express.js (or comparable modern backend frameworks)
• Demonstrated hands-on experience troubleshooting web protocols and server technologies, including Apache Tomcat, Node.js, Web services, SSL/TLS security configurations.
• Demonstrated experience using modern testing platform such as Jest or Karma.
• Demonstrated experience with DevOps tools including Git, Jenkins and Nexus.

Responsibilities

• Participate in all scrubs, sprint, planning and grooming sessions
• Consult and coordinate with stakeholders for problem resolution, task scheduling, resource needs, and task clarification.
• Work in partnership with an integrated team of staff and contractors.
• Coordinate and collaborate with security operations, engineering, testing, and other teams to provide system information and technical support.
• Understand and work within approved cloud environments – example, AWS
• Design develop and modify software systems
• Unit test software and perform code reviews.
• Design and implement scalable search and retrieval systems leveraging Elasticsearch.
• Develop an integrate LLM power capabilities, including Retrieval Augmented Generation (RAG) pipelines.
• Document and track vendor software roadmaps for software and patch version updates.

Skills

Lean Agile Development

Requirements to design specs

AI-assisted retrieval

RAG pipelines

Vector search

Elasticsearch

React SPA development

RESTful APIs

DevOps tools

Git/Jenkins/Nexus

Tools

Elasticsearch

Node.js

Express.js

Jest

Karma

Git

Jenkins

Nexus

ApacheTomcat

Job description

B4Corp seeks a Software Engineer in Chantilly, VA, to join an integrated team supporting U.S. intelligence and defense communities.

The role requires a TS/SCI clearance with polygraph, hands-on work across frontend, backend, and AI-enabled data pipelines, and collaboration with security, engineering, and testing teams. You will design, develop and test software systems, implement scalable search using Elasticsearch, and build LL-based capabilities including RAG pipelines in AWS cloud