AI Applications Engineer - Full-Stack AI/LLM Pipelines

BigBear.ai; Columbia (MD); On-site; USD 120,000 - 180,000; Full time

Job summary

BigBear.ai is seeking an AI Applications Engineer to develop and maintain AI applications and a config-driven decision-support platform combining LLM-powered chat, structured data, and dashboards to support operational readiness and logistics workflows.

You will own features end-to-end across backend APIs, database, and a modern React UI while supporting the existing Dash/Flask application during migration.

Qualifications

• 3+ years of full-stack development with Python and React/TypeScript.
• Ability to obtain and maintain security clearance.
• Hands-on LLM/RAG experience building production features with LangChain or LangChain4J.
• Experience building and consuming REST APIs (FastAPI or similar).
• Strong PostgreSQL skills including schema design and migrations (pgvector a plus).
• Comfort with Docker and CI/CD workflows.

Responsibilities

• Build and maintain full-stack features: FastAPI services, PostgreSQL schema/migrations, and React/TypeScript UI in an Nx monorepo
• Design, implement, and maintain LLM/RAG pipelines using LangChain (Python) or LangChain4J (Java) - retrieval, embeddings, tool/agent orchestration, and prompt workflows
• Integrate LLM providers, document ingestion, semantic search, and chat/report features
• Work with vector stores such as PostgreSQL pgvector and Weaviate, Redis, and Keycloak auth; implement RBAC and secure API patterns
• Connect to external systems via MCP, REST/PostgREST, and related data adapters
• Write and maintain tests (pytest, Vitest) and participate in CI/CD (Docker, GitHub Actions)
• Debug production issues, improve reliability/performance, and keep dependencies and security patches current
• Use AI-assisted development tools effectively: prompt well, review generated code, and ship production-quality changes

Skills

Python

React/TypeScript

LLM/RAG

REST APIs

PostgreSQL

Docker

Testing & CI/CD

Job description

BigBear.ai is seeking an AI Applications Engineer to develop and maintain AI applications and a config-driven decision-support platform combining LLM-powered chat, structured data, and dashboards to support operational readiness and logistics workflows.

You will own features end-to-end across backend APIs, database, and a modern React UI while supporting the existing Dash/Flask application during migration.