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Jiawei Lü

PROFILE

Jiawei Lü

Jiawei focused on stabilizing and optimizing build and runtime systems across several repositories, including facebook/litho, facebook/buck2-prelude, facebook/react-native, and facebook/igl. By reverting incompatible toolchain and configuration changes, Jiawei restored incremental build capabilities, improved build reliability, and re-enabled high-resolution performance timing. In facebook/igl, Jiawei addressed a Vulkan regression by reinstating the VkDevice parameter, ensuring correct image creation. The work involved disciplined change management, deep understanding of build systems, and expertise in C++, Kotlin, and Python. Jiawei’s contributions emphasized risk reduction, robust performance monitoring, and cross-repo consistency, demonstrating thorough debugging and a methodical approach to complex system maintenance.

Overall Statistics

Feature vs Bugs

0%Features

Repository Contributions

8Total
Bugs
5
Commits
8
Features
0
Lines of code
1,534
Activity Months4

Work History

October 2025

1 Commits

Oct 1, 2025

October 2025: Focused on stabilizing Vulkan image creation in facebook/igl by restoring the VkDevice parameter to the Vulkan image constructors, addressing a regression introduced by its removal.

May 2025

4 Commits

May 1, 2025

In May 2025, delivered restoration of high-resolution performance timing and PerformanceResourceTiming reporting for facebook/react-native by reverting four changes that removed or altered timing features. This work re-enabled PerformanceResourceTiming events and JSExecutor::performanceNow, restoring precise timing measurements across platforms and maintaining compatibility with profiling tools and dashboards. Commits reverted include: d45c0419aca95d5fda93c7ff917f21c8212f3886 (Revert D73922341: Report PerformanceResourceTiming events), 5489e18abc7ca4f71d8f651e65d77193b55f61cc (Revert D74892330: Use HighResTimeStamp), 65ef8fe6b8f436dcee0b8d2649fa0c2a1e363192 (Revert D72649815: Replace DOMHighResTimeStamp alias in ReactCommon with new abstractions), and cbfa2ecc9aabaf63d1e21e811e9f6bc5b0379250 (Revert D75006354: Remove JSExecutor::performanceNow()). This restores reliable timing telemetry, enables accurate performance dashboards, and reduces risk of timing-related regressions for developers and QA.

February 2025

1 Commits

Feb 1, 2025

February 2025: Focused on stabilizing AAB-related build configuration in facebook/buck2-prelude by reverting a risky change to pass native libraries to AAB apk_genrule, ensuring reliable AAB processing and reducing build failures.

October 2024

2 Commits

Oct 1, 2024

Month 2024-10: Focused on stability and performance across two repos by reverting incompatible toolchain changes and restoring incremental builds. In facebook/litho, rolled back the kotlin-compiler-embeddable changes to align with the standard kotlin-compiler, addressing artifact incompatibilities. In facebook/buck2-prelude, restored incremental build capability by reversing the restriction that limited builds to full_library, improving build speed and CI reliability. Overall, these changes reduced toolchain risk, accelerated iteration, and reinforced robust build workflows. Technologies demonstrated include Kotlin toolchain management, build-system internals, rollback discipline, and cross-repo collaboration.

Activity

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Quality Metrics

Correctness82.6%
Maintainability82.6%
Architecture82.6%
Performance77.6%
AI Usage25.0%

Skills & Technologies

Programming Languages

C++JavaScriptKotlinObjective-CPythonStarlark

Technical Skills

Build SystemBuild SystemsC++C++ DevelopmentDebuggingDependency ManagementGraphics ProgrammingIncremental CompilationJavaScript DevelopmentKotlinObjective-C DevelopmentPerformance MonitoringPerformance OptimizationPython DevelopmentReverting Changes

Repositories Contributed To

4 repos

Overview of all repositories you've contributed to across your timeline

facebook/react-native

May 2025 May 2025
1 Month active

Languages Used

C++JavaScriptObjective-C

Technical Skills

C++C++ DevelopmentDebuggingJavaScript DevelopmentObjective-C DevelopmentPerformance Monitoring

facebook/buck2-prelude

Oct 2024 Feb 2025
2 Months active

Languages Used

StarlarkPython

Technical Skills

Build SystemsIncremental CompilationPython Development

facebook/litho

Oct 2024 Oct 2024
1 Month active

Languages Used

Kotlin

Technical Skills

Build SystemDependency ManagementKotlin

facebook/igl

Oct 2025 Oct 2025
1 Month active

Languages Used

C++

Technical Skills

C++Graphics ProgrammingVulkan

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