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Fangjian Xiong - Machine Learning Engineer in Boston, MA

Fangjian Xiong

Junior Machine Learning Engineer specializing in NLP and biomedical entity extraction

Northeastern UniversityNortheastern UniversityBoston, MA2 Years ExperienceJunior LevelWorks On-Site

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About

Built and deployed a production LLM-powered biomedical knowledge extraction pipeline that processed millions of papers to identify tools/techniques and produce a unified knowledge graph via active learning NER (Prodigy + spaCy transformers) and entity linking (Bio-tools/Wikidata). Addressed hard NLP engineering challenges like WordPiece span-offset alignment and scaled inference over ~1.5M documents using batching/caching, containerized services, async workers, and orchestration with Prefect/Airflow.

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Key Strengths

  • Built and deployed end-to-end LLM-powered biomedical knowledge extraction system to production
  • Scaled NLP/LLM inference across ~1.5M documents while controlling GPU costs
  • Solved token-offset alignment and entity-collision issues in dense scientific text (WordPiece/span labeling)
  • Designed robust multi-stage pipelines with orchestration (Prefect/Airflow), retries, caching, and parallelism
  • Strong evaluation and reliability practices (unit tests, offline benchmarks, shadow deployments, monitoring)
  • Effective collaboration with non-technical researchers; translates domain needs into technical requirements and trade-offs

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Experience

Machine Learning EngineerNortheastern University College of Science — Network Science Institute (NetSI) · Dec 2024 – Present
NLP Engineer (NER Specialist)Network Science Institute (NetSI) · Oct 2023 – Nov 2024
AI Research Scientist/R & D Engineer — InternshipGaff Assen · Jun 2023 – Aug 2023internship
Coach & Supervisor — Part-timeRobotics Education & Competition Foundation · Aug 2022 – Apr 2023part-time

Education

Northeastern Universitymaster, Applied Machine Intelligence (AI in Healthcare) (2024)
Boston Universitybachelor, Computer Sciences (2023)

Awards

  • Team ranked #1 in the New England region and #4 nationally in the 2023 VEX IQ U.S. Championship

Skills

AI AgentsAWSBigQueryC#C++Data PreprocessingData CleaningData EngineeringDockerGPTHugging FaceJavaKerasKubernetesLarge Language Models (LLMs)

Languages

English

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Fangjian XiongJunior Machine Learning Engineer specializing in NLP and biomedical entity extraction