Chijun Sima
Senior Software Engineer at LLVM Foundation
Guangzhou City, Guangdong Province, China
Summary
👤
Senior🎓
Top SchoolChijun Sima is a Senior Software Engineer with nine years of experience building large-scale, cost-efficient systems for cloud and ML workloads. At Tencent he co-designed Ekko, a production DL runtime serving over a billion users and reducing model-update latency, and later added an operations-research based shard placement scheduler that cut cluster costs by up to 30%. He also built Lightning, a WebAssembly-powered SFI runtime used for multi-tenant storage and serverless use cases, emphasizing tight resource control and tiered compilation. An active LLVM open-source contributor, Chijun improved dominator-tree updates and real-world compile performance by orders of magnitude, work that was upstreamed into LLVM releases. Based in Guangzhou, he blends systems research and pragmatic engineering across cloud systems, ML systems, serverless, and compilers. He tends to tackle hard infrastructure trade-offs—e.g., latency vs. cost—by applying algorithms and practical engineering to production at scale.
9 years of coding experience
3 years of employment as a software developer
High school diploma, 4.45/5.00, High school diploma, 4.45/5.00 at Shenzhen Middle SchoolBachelor's degree, Computer Science, 3.85/4.00, Bachelor's degree, Computer Science, 3.85/4.00 at South China University of Technology
English, Chinese
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (69)
python10
cpp10
nosql10
data-model10
database10
fst10
in-memory10
java10
disk10
licensing10
strings10
lists10
redis10
key-value10
message-broker10
Programming languages (7)
Github contributions (5)
NutshellySima/Gomoku-UWP
Nov 2017 - Dec 2022
Contributions:17 releases, 24 commits, 156 pushes in 5 years 1 month
NutshellySima/zipcracker
Feb 2017 - Aug 2018
Contributions:6 releases, 7 PRs, 21 pushes in 1 year 5 months
dictionaryzipfilepythoncrack
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