Qichen Zhang
Senior Software Engineer at Amazon Web Services (AWS)
Mountain View, California, United States
Summary
👤
Senior🎓
Top SchoolQichen Zhang is a Senior Software Engineer based in Mountain View with nine years of experience building high-performance data analytics systems, primarily on Amazon Redshift. He has driven kernel-level improvements to the Redshift query execution engine—reducing data skew, decoupling compute from storage, and enabling elastic resize and high-concurrency performance gains (e.g., 5x QPH improvements at 20x concurrency). Qichen has also implemented advanced SQL features (ROLLUP/CUBE/GROUPING SETS) and optimized external data processing for Spectrum (ORC/Parquet support and partition handling). Comfortable at both low-level engine work and system architecture, he blends rigorous CS foundations from Sun Yat-sen and CMU with a pragmatic focus on measurable production impact. An often-overlooked strength is his track record of improving operational elasticity, allowing clusters to scale efficiently without sacrificing per-query latency.
9 years of coding experience
5 years of employment as a software developer
Master’s Degree, Computer Software Engineering, 3.55/4.0, Master’s Degree, Computer Software Engineering, 3.55/4.0 at Carnegie Mellon University, Silicon ValleyBachelor’s Degree, Computer Science, 3.8/4.0, Bachelor’s Degree, Computer Science, 3.8/4.0 at Sun Yat-Sen University
English, Chinese
Stackoverflow
3reputation
725reached
0answers
1question
Github Skills (3)
xaml6
wpf6
listbox6
Github contributions (5)
QichenZhang93/CloudComputing
Dec 2016 - Apr 2017
Contributions:5 commits, 11 pushes, 1 branch in 3 months
QichenZhang93/srid-medical
Nov 2017 - Nov 2017
Contributions:7 pushes, 1 branch in 4 days
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