Xiaohai Xu
Security Researcher at OtterSec
Shanghai, Shanghai, China
Summary
🤩
Rockstar🎓
Top SchoolXiaohai Xu is a Web3 security researcher with nine years of experience, currently auditing smart contracts at OtterSec after a stint building large-scale C++ ranking services at Microsoft. He founded Project Sekai CTF, a top-tier international capture-the-flag team, and has deep roots in cryptography, reverse engineering, and blockchain security alongside competitive programming pedigree (ACM-ICPC regional and DEFCON CTF finalist). A University of Melbourne alumnus who made Dean’s List (top 0.1%) for three years, he also contributed to open-source projects like Milvus, optimizing ANN algorithms and maintaining its Java SDK. Combining production-grade engineering, research rigor, and hands-on offensive security practice, he brings a rare mix of algorithmic depth and practical exploit discovery to Web3 risk reduction.
9 years of coding experience
5 years of employment as a software developer
Foundation degree General Studies, Foundation degree General Studies at Trinity College, the University of MelbourneThe University of MelbourneHigh School General Studies, High School General Studies at Shanghai High School
Chinese, English
Github Skills (102)
similarity-search10
vector-search10
neural-search10
nearest-neighbors10
vector-database10
milvus10
semantic-search10
cloud-native10
clustering10
sdk10
golang10
faiss10
scalable10
database10
integrate10
Programming languages (13)
Github contributions (5)
sahuang/sahuang.github.io
Jul 2022 - Nov 2024
Website for my CTF Writeups. https://sahuang.github.io/
Contributions:2 PRs, 28 pushes, 3 branches in 2 years 4 months
ctfwriteupsctf-writeups
project-sekai-ctf/sekai.team
Jan 2022 - Dec 2022
Website of Project SEKAI, a CTF team.
Contributions:7 reviews, 31 commits, 71 PRs in 11 months
project-sekaictfsekai
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