Xuejun Yang
Principal Software Engineer at Microsoft
Bellevue, Washington, United States
Summary
🤩
Rockstar🎓
Top SchoolXuejun Yang is a Principal Software Engineer in Bellevue with 12 years of experience building secure, high-reliability systems for Azure and confidential computing. He combines deep compiler and low-level systems expertise—from his PhD work on Csmith to contributions preventing infinite loops and tightening C-standard compliance—with practical security hardening in projects like Open Enclave. Known for pursuing efficiency and removing redundancy, he persistently drives maintainability and performance improvements while addressing subtle correctness and speculative-execution risks. At Microsoft he partners with mission-critical customers to deliver production-ready enclave and cloud solutions, and his open-source work reflects a penchant for careful, standards-minded engineering that reduces long-term technical debt.
11 years of coding experience
18 years of employment as a software developer
The University of UtahBachelor of Science (BS), Bachelor of Science (BS) at Tsinghua University
English, Chinese
Github Skills (22)
ncl10
sgx10
el10
c1110
security10
c1710
cl10
code-generation10
optmization10
performance-optimization10
optimisation10
enclave10
conclave10
optimization10
assembly9
Programming languages (4)
Github contributions (5)
csmith-project/csmith
Jun 2015 - Jul 2021
Csmith, a random generator of C programs
Role in this project:
Back-end Developer
Back-end DeveloperContributions:1 release, 8 reviews, 50 commits in 6 years 1 month
Contributions summary:Xuejun primarily focused on enhancing the Csmith project's code generation capabilities. Their contributions included preventing infinite loops in generated C programs by adjusting loop control structures and adding a flag to generate programs that execute faster. The user also removed obsolete code, specifically the "deputy" feature and various extension-related code, improving the codebase's maintainability and focus. Additionally, the user implemented stricter adherence to C standards regarding the handling of union fields and pointer interactions.
c-programsrandom-generatorprograms
openenclave/openenclave
May 2019 - Jul 2021
SDK for developing enclaves
Role in this project:Back-end & Security Engineer
Back-end & Security EngineerContributions:17 reviews, 46 commits, 23 PRs in 2 years 2 months
Contributions summary:Xuejun primarily focused on security enhancements and platform compatibility within the Open Enclave SDK. Their contributions included disabling simulation mode on Windows to address register corruption issues, adding `lfence` instructions to the `EENTRY` and `entersim.asm` files to mitigate speculative execution vulnerabilities, and fixing crashes in the `oedump` tool. They also worked on integrating switchless ocalls and contributed to enclave configuration.
trusted-execution-environmentdevelopingteesdkconfidential-computing
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