812061 Software Engineer $260,000.00

Position Level: Level 1 – Subject Matter Expert

Location: Chantilly, VA
Core hours: 9 am – 4 pm
Salary: Up to $260,000 per year

About the role

This position requires an active Top Secret (TS/SCI) clearance with a Polygraph. You will work in partnership with an integrated team of staff and contractors, coordinating with security operations, engineering, testing, and other teams to provide system information and technical support within approved cloud environments (e.g., AWS).

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.
• Design, develop, and modify software systems.
• Unit test software and perform code reviews.
• Design and implement scalable search and retrieval systems leveraging Elasticsearch.
• Develop and integrate LLM-powered capabilities, including Retrieval Augmented Generation (RAG) pipelines.
• Document and track vendor software roadmaps for software and patch version updates.

Requirements

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

Qualifications

• Developmental: 0–2 years’ experience
• Full Performance: 3–5 years’ experience
• Senior: 6–10 years’ experience
• Expert: 11–15 years’ experience
• Subject Matter Expert (SME): 16+ years’ experience

Preferred Qualifications

• Experience with the customer’s Lean Agile methodology.
• Experience evaluating, selecting, or integrating LLMs (e.g., OpenAI, open-source models) into enterprise applications.
• Experience with vector databases, hybrid search (keyword + semantic), and relevance optimization.
• Experience with or exposure to RAG, LLM integration, or semantic search.
• Experience with Elasticsearch or similar search platforms, with exposure to optimization or scaling.
• Experience measuring teams in search engine engineering, AI/LLM best practices, with demonstrated ability to improve overall team capability.

About the company

B4Corp is a small defense contracting company focused on providing an optimum environment for mission-focused, highly skilled consultants to support the United States intelligence community and other defense organizations. The company emphasizes low overhead, high efficiency, and high salaries to allow employees to excel at meeting client needs.

Benefits

• Retirement:
  • Full Vanguard 401k plan with a full scope of investment options.
  • 100% employer-matched contribution up to 6% of salary.
  • Ability to max out 401k savings ($57k, or $63.5k if over 50).
  • Annual B4Corp phantom stock (2-year vesting period).
• Insurance:
  • Medical: United Health Care (UHC) with multiple plan options.
  • Dental: United Concordia (UC) Flex Plan.
  • Vision: Vision Service Plan Insurance Co (VSP) Signature Plans.
  • Short-term disability: 60% of salary up to $2,000/week (Mutual of Omaha).
  • Long-term disability: 60% of salary up to $10,000/month (Mutual of Omaha).
  • Life insurance: $200,000 (Mutual of Omaha).
• Paid Time Off:
  • Seven weeks of leave per year (including ten federal holidays).
  • Flexible work schedule with comp time (with customer approval).
• Employee Referral Bonus: $3,000 per year for every year a referred employee works at B4Corp.