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silin liu

Mid-level AI/ML Engineer specializing in LLM agents, RAG, and enterprise ML systems

New York City, NYAI Engineer5 years experienceMid-LevelTransportation & LogisticsGovernmentTechnology
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About

Built a production multi-agent recommendation/RAG system for internal data analysts to speed up weekly report creation by improving document discovery and automating report/SQL generation. Implemented LangGraph-based orchestration with deterministic agent routing, robust error handling (interrupt/resume), and metadata-driven semantic chunking for diverse PDF/document formats, plus monitoring for latency, throughput, and token/cost efficiency.

Experience

AI EngineerMetropolitan Transportation Authority (MTA)
Machine Learning EngineerInternational Business Machines Corporation (IBM)

Education

Stevens Institute of Technologymaster, Computer Engineering (2020)
Hunan Universitybachelor, Electrical Engineering (2018)

Key Strengths

  • Built and deployed a multi-agent recommendation/RAG system to reduce analyst time spent finding documents for weekly reporting
  • Designed agent workflows as a graph-structured state machine with deterministic routing, error handling, and interrupt/resume support
  • Handled heterogeneous document formats (including PDFs) using format filtering and semantic chunking with metadata-aware retrieval
  • Implemented hybrid retrieval using a vector database (Chroma) combining semantic search with keyword mapping
  • Established production monitoring for latency/throughput and token/cost efficiency using tracing and caching/embedding optimizations
  • Effective stakeholder collaboration via iterative demos and production stability evidence (logs, error handling over 1–2 weeks)

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Languages

English

Skills

LangGraphLangChainMulti-Agent OrchestrationTool CallingFunction CallingAgent Memory (Episodic, Semantic)Planning & Reasoning (ReAct, Plan-and-Execute, Chain-of-Thought)Agent EvaluationRAG Pipeline DesignPrompt EngineeringFine-tuning (LoRA, QLoRA, PEFT)Llama 3.1Llama 3.2Hugging Face TransformersOpenAI API