Jiahao XU

Sydney, New South Wales, Australia

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Summary

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Rockstar

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Top School

Jiahao XU is a software engineer based in Sydney with eight years of hands-on experience building and optimizing backend systems, particularly in Rust, C/C++ and Python, and a Bachelor of Computing from the University of Sydney. He specializes in Linux-native development and DevOps workflows—comfortable with git, Bash, Docker and systemd—and has a track record of improving build processes and runtime efficiency in high-profile open-source projects like tokio, rust-lang, and ring. His contributions include performance-focused refactors (e.g., nextest test runner and tokio bytes optimizations), build-script robustness for cryptography libraries, and enhancements to Rust’s std::io for IPC, showing both systems-level rigor and attention to developer ergonomics. Pragmatic and curious, he routinely reduces binary size and simplifies async codepaths, and is quick to adopt new languages and frameworks as project needs evolve.

8 years of coding experience

The University of Sydney

Chinese, English

Github Skills (28)

asynchronous10

primitive10

paths10

async10

testing10

synchronized10

memory-management10

build-system10

io10

networking10

security10

binding10

compiler-compiler10

cryptography10

synchronize10

Programming languages (18)

PowerShellJavaC++RustCGoPerlHTML

Github contributions (5)

gyscos/zstd-rs

Jul 2022 - Jan 2023

A rust binding for the zstd compression library.

Role in this project:

Backend Engineer

Contributions:15 reviews, 9 commits, 21 PRs in 6 months

Contributions summary:Jiahao focused on optimizing the build process and reducing the binary size of the `zstd-sys` crate, a Rust binding for the Zstandard compression library. Their contributions included refactoring the build script to incorporate optimization flags, reducing code size by removing unused functions and merging constants, and refactoring the build process itself. Additionally, the user fixed various build script issues related to file paths and cargo printing.

bindingrustrust-bindingcompressionrust-bindings

tokio-rs/bytes

Mar 2022 - Jul 2022

Utilities for working with bytes

Role in this project:

Back-end Developer

Contributions:14 reviews, 6 commits, 5 PRs in 4 months

Contributions summary:Jiahao focused on optimizing and improving the `tokio-rs/bytes` library, which provides utilities for working with bytes in Rust. Their contributions include optimizing the `BytesMut::reserve` function to reuse existing memory where possible, fixing bugs in `BytesMut::reserve_inner`, and adding conversions between `BytesMut` and `Bytes` to `Vec<u8>`. Furthermore, the user improved the amortized performance of `BytesMut` operations.

serdecrateproc-macroduplicatesrust-language

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