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Systems engineer and technical educator who builds algorithms, infrastructure tools, and educational content around competitive programming and distributed systems.

Competitive programming & algorithm designTime-series data processing & optimizationGo infrastructure & networkingDistributed systems & service meshSystems architecture & cloud infrastructureTechnical writing & knowledge sharing

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Beijing

Hao Chen

Top 50%
@haoel

Chen maintains haoel/leetcode, a comprehensive LeetCode solutions repository with broad reach, alongside utility projects like haoel/ipsearch and playful experiments like haoel/christmas.

coolshell.cn

LeetCode Solutions. I collected solutions to thousands of LeetCode coding problems.

18k

Downsampling. I wrote a tool that shrinks massive time series data down to usable size.

206

IP Search. I built a tool to search and identify IP addresses against geographic databases.

72

mTLS. I built a Go example showing how to set up two-way verified secure connections.

247

CPU Cache. I wrote test cases showing how CPU cache works in practice.

109

Websockify for Nginx. I embedded websockify into Nginx to proxy remote desktop connections through your browser.

150

Christmas Tree. I drew a Christmas tree using only CSS.

59

Imgfetch. I made a tool that transforms images into colored text art.

59

Chainstory. I built a web app for creating and sharing interactive branching stories.

2