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Hai Chi

PROFILE

Hai Chi

Worked on the facebook/fbthrift repository to deliver two core features focused on performance and efficiency in C++ and Rust. Developed a loop-based thrift binary protocol skip algorithm, replacing recursion with looping to accelerate processing of fixed-size types in lists, sets, and maps, resulting in up to 28x faster skip operations for targeted data structures. Also implemented connection identity caching within the connection context, reducing per-request certificate parsing and improving latency without increasing dependencies by leveraging folly::erased_unique_ptr. Demonstrated strengths in system programming, performance optimization, and system design, with careful benchmarking and integration to ensure maintainability and measurable impact.

Overall Statistics

Feature vs Bugs

100%Features

Repository Contributions

2Total
Bugs
0
Commits
2
Features
2
Lines of code
355
Activity Months2

Your Network

3324 people

Same Organization

@meta.com
2798

Shared Repositories

526
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Aaron BradyMember
Adrian CatanaMember
Adlet ZeinekenMember
Adolfo VictoriaMember
Adrian EnacheMember
Alan FrindellMember

Work History

December 2025

1 Commits • 1 Features

Dec 1, 2025

December 2025 monthly summary for facebook/fbthrift: Delivered Connection Identity Caching in the Connection Context to cache authenticated identities, reducing per-request certificate parsing and improving latency without adding dependencies. Implemented with folly::erased_unique_ptr to avoid introducing new dependencies, and integrated with existing identity extraction paths. Change aligns with historical discussions and reviews.

June 2025

1 Commits • 1 Features

Jun 1, 2025

June 2025—fbthrift performance optimization: Implemented a loop-based thrift binary protocol skip algorithm to accelerate processing of fixed-size types in lists, sets, and maps. This optimization yielded up to 28x performance gains on targeted data structures, with a minor regression for simpler cases due to the switch from recursion to looping. The change introduces a maintainable non-recursive skip path and includes benchmarking to validate gains. Overall impact includes improved throughput for skip operations and stronger code quality via refactoring; demonstrated skills in performance optimization, benchmarking, and safe refactoring.

Activity

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Quality Metrics

Correctness90.0%
Maintainability90.0%
Architecture90.0%
Performance100.0%
AI Usage20.0%

Skills & Technologies

Programming Languages

C++Rust

Technical Skills

C++ developmentRustperformance optimizationsystem designsystem programming

Repositories Contributed To

1 repo

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

facebook/fbthrift

Jun 2025 Dec 2025
2 Months active

Languages Used

RustC++

Technical Skills

Rustperformance optimizationsystem programmingC++ developmentsystem design