Xin Liu
Senior Software Engineer at YouTube
San Jose, California, United States
Summary
🤩
Rockstar🎓
Top SchoolXin Liu is a Senior Software Engineer with seven years of experience building scalable web and distributed systems, specializing in recommender and ads systems, machine learning pipelines, and large-scale data platforms. He has driven ads relevance and prediction work at Google (Search Ads Quality and YouTube Shorts), and applied customer modeling and CLV prediction at Adobe, blending strong algorithmic fundamentals with practical ML deployment. Xin contributes to notable open-source projects like HarfBuzz, where he improved font subsetting—an indicator of attention to low-level system detail beyond typical ML work. Based in San Jose, he pairs an academic background from UCLA and international study with hands-on engineering across back-end systems, data pipelines, experiment design, and LLM-influenced query understanding. Colleagues rely on him to translate complex modeling and systems requirements into reliable, production-ready solutions.
7 years of coding experience
7 years of employment as a software developer
Summer School, Summer School at University of California, BerkeleyExchange Program Computer Engineering, Exchange Program Computer Engineering at Mid Sweden UniversityBachelor's degree Computer Science, Bachelor's degree Computer Science at Beijing University of TechnologyUniversity of California, Los AngelesSenior High School Science, Senior High School Science at The Second High School Attached to Beijing Normal University
English, Chinese, Swedish
Github Skills (11)
c-language10
cprogramming-language10
data-structure9
opentype9
data-structures9
algorithms8
algorithm8
performance-optimization8
build-automation7
typography7
unicode7
Programming languages (6)
Github contributions (5)
harfbuzz/harfbuzz
Mar 2019 - Jan 2023
HarfBuzz text shaping engine
Role in this project:
Back-end Developer
Back-end DeveloperContributions:70 reviews, 169 commits, 191 PRs in 3 years 10 months
Contributions summary:Xin's commits focus on improving the HarfBuzz text shaping engine, primarily addressing issues within the font subsetting functionality. Their work includes removing commented-out lines, removing deprecated variables, and updating function arguments to remove the use of these deprecated variables. The user implemented and integrated features related to subsetting the name table, including options to retain specific name IDs, keeping legacy name records, and handling name languages, which aligns with the function of fontTools.
aatharfbuzzc-plus-plusfontstext-shaping
qxliu76/fonttools
Mar 2022 - Feb 2025
A library to manipulate font files from Python.
Contributions:53 pushes, 11 branches in 2 years 11 months
pythonfontfontswoffcjk
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