Ji Xin
Senior Machine Learning Engineer at Instacart
Canada
Summary
👤
Senior🎓
Top SchoolJi Xin is a Senior Machine Learning Engineer with 9 years of experience, currently building search and recommendation systems at Instacart after leading Transformer-based foundation model efforts at TD/Layer6. He holds a PhD from the University of Waterloo with multiple first-author publications at ACL, EMNLP, and NeurIPS, and his academic work focused on accelerating Transformer inference (early exiting) and interpretability. Ji blends research rigor—publishing on LLM uncertainty quantification and dense retrieval—with hands-on production deployment of models for large-scale tabular and time-series banking data. Known for moving ideas from papers to production, he balances deep NLP expertise with practical engineering that improves prediction accuracy and efficiency in real-world systems.
9 years of coding experience
9 years of employment as a software developer
Bachelor of Science - BS, Physics, Bachelor of Science - BS, Physics at Tsinghua UniversityDoctor of Philosophy - PhD, Computer Science, Doctor of Philosophy - PhD, Computer Science at University of Waterloo
English
Github Skills (49)
pytorch10
python10
audio10
natural-language-processing10
nlp10
retrieval9
relation-extraction9
sentence-transformers9
transformers9
llm9
machine-learning9
multimodal9
inference9
bert9
knowledge-graph9
Programming languages (4)
Github contributions (5)
thunlp/KNET
Nov 2017 - Feb 2019
Neural Entity Typing with Knowledge Attention
Contributions:16 commits, 12 pushes, 1 branch in 1 year 3 months
entity-typingknowledge-graph
castorini/berxit
Nov 2019 - Jan 2021
Contributions:138 commits, 1 branch in 1 year 2 months
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