# Justin Wei

> Software Engineer in Developer Experience

Location: San Mateo, California, United States
Profile: https://flows.cv/justinwei

Software Developer with specific interests in scalable continuous build, integration, and test systems.

## Work Experience
### Staff Software Engineer @ Stack AV
Jan 2023 – Present

### Staff Software Engineer @ ByteDance
Jan 2020 – Jan 2023 | San Jose, California, United States
Client Infrastructure team; worked variously on Gradle, Kotlin, R8, Static Analysis, Lint, Continuous Integration.

Focused on integrating Redex optimizations into the TikTok Android application primarily for compressed binary size reduction.

### Staff Software Engineer @ Lyft
Jan 2019 – Jan 2020 | San Francisco Bay Area
Helped migrate Android Repository from Gradle to Buck to Bazel in multi-step dual-build scenario.
Helped maintain remote cache, improved Bazel performance/stability w.r.t. Android Java/Kotlin codebases.

### Senior Software Engineer, Tools and Infrastructure @ Google
Jan 2013 – Jan 2019 | Mountain View
Worked on the continuous test system for Chromecast with a focus on general infrastructure, scale, and the Cast Android SDK.
Worked on Google Play Services with an emphasis on Test Systems, Build Infa, and increasing/maintaining code quality.

### Software Engineer @ Qualcomm
Jan 2011 – Jan 2013 | San Diego
Write, maintain, and analyze the output of performance profiling tools for resource usage and CPU time usage.

Identify and optimize performance bottlenecks with a focus on small changes with large impacts to reduce change complexity and risk of creating new issues.

Drew up the requirements for, designed, implemented, and pushed out two profiling frameworks targeted at different audiences. The first was for those who really wanted a good look at the software's internals and gave a view into software tasks, hardware threads, and operating system calls. The second was made to be user-friendly and could tie into existing testing and automation frameworks nicely.

Designed and implemented a Code Layout Optimization script which aimed to reduce L1 Instruction Cache misses for targeted scenarios. Simulated runs shows a 40% reduction in overall misses although real-world testing uncovered fundamental problems with execution tracing.

Maintain a PMU Profiling script and adapt it for new metrics and processor versions.

### Interim Engineering Intern @ Qualcomm
Jan 2010 – Jan 2010
Worked on memory optimization efforts with focus on C code, ELF binary, and configuration modification scripts using existing optimization code and functionality.


## Education
### BS in Computer Science
The University of Texas at Austin


## Contact & Social
- LinkedIn: https://linkedin.com/in/weijustin

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Source: https://flows.cv/justinwei
JSON Resume: https://flows.cv/justinwei/resume.json
Last updated: 2026-04-01