AI Engineer: Build AI Agents and Integrate LLMs into Our Existing Product

We're looking for an experienced AI engineer to build AI agents and integrate LLM features into our existing product. Work includes designing agent workflows with tool use, building an AI assistant or chatbot over our data (RAG), and connecting OpenAI and Anthropic (Claude) APIs to our backend. Python is preferred, and AWS experience is a plus. You should have hands-on experience shipping AI systems to production, not just prototypes. Expect 1 to 3 months, possibly longer for the right fit. In your proposal, describe an AI agent or integration you built and how you handled reliability and cost.