Jay Zhan
Senior Data Engineer
Taiwan
Summary
🤩
Rockstar🎓
Top SchoolJay Zhan is a Senior Data Engineer with a decade of experience building modern data infrastructure and lakehouse platforms, currently driving in-house lakehouse development at TSMC from Taiwan. He combines strong backend and query-engine expertise demonstrated by notable contributions to Apache DataFusion (adding scalar UDFs, list/struct operations, and aggregation optimizations) and active roles within the ASF and Arrow communities. His background spans cloud migration and gateway work at TikTok, streaming SQL extensions, and research internships at Microsoft and Synopsys, showing a blend of production systems and compiler-level problem solving. Jay’s GitHub motto—"Think more on what to focus on"—reflects a pragmatic, impact-first approach to engineering that favors targeted optimizations over broad rewrites.
10 years of coding experience
2 years of employment as a software developer
Bachelor's degree, Computer Science and Information Engineering, Bachelor's degree, Computer Science and Information Engineering at National Central UniversityMaster of Science - MS, Computer Science, Master of Science - MS, Computer Science at National Yang Ming Chiao Tung University
English, Japanese, Chinese
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (12)
fusion10
rust10
sql10
data-structure9
data-structures9
algorithms9
expression8
type-coercion8
data-analysis8
expressions8
parse8
parsing8
Programming languages (14)
Github contributions (5)
apache/datafusion
Jan 2023 - Apr 2025
Apache DataFusion SQL Query Engine
Role in this project:
Back-end Developer
Back-end DeveloperContributions:1936 reviews, 508 PRs, 253 pushes in 2 years 3 months
Contributions summary:The user, jayzhan211, made several contributions to the Apache DataFusion project. Their work included adding support for scalar UDFs, implementing features related to list and struct operations, and optimizing aspects of the aggregation process. Key changes involved addressing specific issues such as handling for null values in array functions and addressing schema mismatches, and rewrites of existing components. These contributions suggest expertise in query planning, data processing, and optimization within a data analysis context.
querypythonquery-enginedataframerust
accelsao/Codeforces-B
Nov 2017 - Jun 2018
Contributions:570 pushes, 1 branch in 7 months
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