Senior Python AI Engineer (LLM & Multi-Agent Systems)

Description Join a Company That Invests in You Seeking Alpha is the world’s leading community of engaged investors. We’re the go-to destination for investors looking for actionable stock market opinions, real-time market analysis, and unique financial insights. At the same time, we’re also dedicated to creating a workplace where our team thrives. We’re passionate about fostering a flexible, balanced environment with remote work options and an array of perks that make a real difference. Here, your growth matters. We prioritize your development through ongoing learning and career advancement opportunities, helping you reach new milestones. Join Seeking Alpha to be part of a company that values your unique journey, supports your success, and champions both your personal well-being and professional goals. What We're Looking For Role Overview: We are developing Ask Seeking Alpha — a high-load financial analysis system based on Large Language Models. The architecture is built on complex multi-agent orchestration using LangGraph , FastAPI , and Elasticsearch . We are looking for a Senior Python AI Engineer specialized in Generative AI to design agent workflows, optimize interactions with models (OpenAI, AWS Bedrock), and ensure the reliability of non-deterministic systems in production. Tech Stack: Python (Asyncio), FastAPI, LangChain, LangGraph, Pydantic, Elasticsearch, AWS Bedrock / OpenAI API, LangSmith. What You'll Do Agent Architecture: Design and implement complex agent orchestration logic using LangGraph . You will define state management, conditional routing, and error handling within the agent graph. Tool Engineering: Build and optimize the tool layer (function calling) that allows LLMs to interact with internal financial APIs and databases accurately. Performance Optimization: -Reduce end-to-end latency through asynchronous processing and streaming (SSE). -Implement semantic caching strategies to minimize API costs and response time. -Optimize token usage without sacrificing answer quality. Observability & Evaluation: Implement automated evaluation pipelines using LangSmith . You will be responsible for setting up regression testing for prompts and agents to measure quality (correctness, faithfulness) before deployment. Advanced RAG: Refine retrieval strategies. Work on hybrid search implementation (Keyword + Vector), re-ranking, and query expansion to feed the most relevant context to the model. Requirements Python Expert: Strong proficiency in modern Python. Deep understanding of asynchronous programming (asyncio) patterns is mandatory, as our entire I/O pipeline (Network, DB, LLM) is non-blocking. Experience with FastAPI and Pydantic (v2). Agentic Frameworks: Production experience with LangChain . Hands-on experience or deep conceptual understanding of LangGraph (or similar state-machine based agent frameworks). Deep LLM Expertise (What we mean by "Deep"): Non-determinism Management: Strategies for handling LLM hallucinations and ensuring reliable outputs (e.g., self-correction loops, specific prompting techniques like CoT/ReAct). Structured Outputs: Experience forcing LLMs to adhere to strict schemas (Pydantic/JSON mode) for reliable downstream processing. Context Optimization: Advanced strategies for managing limited context windows (summarization chains, sliding windows, selective context injection) beyond simple truncation. Inference Economics: Understanding the trade-offs between model size, latency, and cost (e.g., when to route to GPT-4 vs. a smaller/faster model). Nice to Have Experience with Elasticsearch (DSL queries, analyzers). Knowledge of vector databases and embedding models. Background in FinTech or familiarity with financial data structures.