Senior Python Engineer – RAG / LangGraph

Strictly W2 Only - No C2CJob Title: Software Development EngineerLocation: North Chicago, IL 60064Duration: 6 Months ContractWork Type: Hybrid⚠️ Local candidates preferredKey ResponsibilitiesAI / RAG Platform Development (Primary)Design and build production-grade RAG (Retrieval-Augmented Generation) pipelines for querying complex enterprise documents.Implement: Hybrid search, Embeddings, Chunking strategies, Cross-encoder reranking, Multi-agent answer synthesisBuild intelligent systems for pharmaceutical / regulatory document extraction.OCR / Document IntelligenceDevelop document processing pipelines using AWS Textract for: Tables , Handwritten text Structured forms, Certificates, Batch recordsImprove structured data extraction accuracy from complex PDFs.Backend Engineering (90% Focus): Develop backend systems using: Python, FastAPI, Async programmingBuild: REST APIs, Streaming endpoints (SSE), Authentication, Background jobs, Logging / monitoring systemsLLM Integration / Agentic AIIntegrate and orchestrate multiple LLMs such as: Claude, GeminiBuild use cases for: Intent classification, Data extraction, Validation workflows, Chatbot experiences, LangGraph agentic workflowsSecondary Frontend (10%)Support React / Next.js UI components such as: Chat interface, PDF viewer highlights, Progress trackingMust Haves3–6 years experience in software engineering.Strong Python backend development experience.Hands-on experience with: FastAPI, REST APIs, Async systemsStrong hands-on experience building: RAG pipelines, Chunking techniques, Embeddings, Retrieval systems, LLM integration experience.Experience with: LangGraph / agentic AI workflows, Chatbot systems, System design / scalable backend architectureStrong document parsing / extraction experience.⚠️ Profiles missing Python + FastAPI + RAG + LLM experience may be rejected.Nice to HaveReact / Next.js / TypeScript.AWS cloud services: EC2, S3, Textract, RDSPostgreSQL knowledge.Weaviate / Neo4j / vector databases.Docker / nginx.Pharma / regulated document domain experience.Gemini Vision / GPT-4V document image analysis.