Haojun Sui
Senior Software Engineer at Microsoft
Seattle, Washington, United States
Summary
👤
Senior🎓
Top SchoolHaojun Sui is a Senior Software Engineer at Microsoft with 11 years of experience focused on improving boot and file-open performance for large-scale consumer platforms. Based in Seattle, he progressed through multiple engineering roles at Microsoft since 2017, combining systems-level performance tuning with pragmatic engineering execution. He holds strong quantitative foundations from Penn State with degrees spanning computer science, mathematics, and applied statistics, which he applies to performance profiling and optimization. An early open-source contributor to DuckDuckGo’s zeroclickinfo-goodies, he has hands-on backend experience in Perl and a penchant for algorithmic problem solving—evidenced by contributions like a prime generator and LCM calculator. Colleagues describe him as methodical and results-driven, comfortable bridging deep technical detail with shipping measurable improvements.
10 years of coding experience
10 years of employment as a software developer
High School, High School at Santiam Christian High SchoolBachelor of Science (B.S.) Computer Science, Bachelor of Science (B.S.) Computer Science at Penn State University
English, Chinese
Github Skills (12)
algorithm10
data-structures10
algorithms10
instant-view10
duckduckgo10
perl10
instantsearch10
data-structure10
math9
mathematics9
javascript4
cryptography4
Programming languages (8)
Github contributions (5)
duckduckgo/zeroclickinfo-goodies
Oct 2015 - Oct 2015
DuckDuckGo Instant Answers based on Perl & JavaScript
Role in this project:
Back-end Developer
Back-end DeveloperContributions:9 commits, 2 PRs, 5 comments in 9 days
Contributions summary:Haojun primarily contributed to implementing and enhancing the "zeroclickinfo-goodies" project, specifically focusing on features related to mathematical calculations. Their work included developing a prime number generator and a least common multiple calculator. Furthermore, they optimized and refactored existing code and updated personal information within the project, showcasing a commitment to functionality and maintainability. The user utilized Perl for their implementations.
javascriptduckduckgoinstant-answersperlinstant
haojunsui/haojunsui.github.io
Jun 2016 - Aug 2017
Contributions:162 pushes, 1 branch in 1 year 2 months
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