Bonnie Xu

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Summary

🤩

Rockstar

Bonnie Xu is a backend-focused software engineer with 10 years of experience building high-performance networking and data platform systems, now a Member of Technical Staff at OpenAI in San Francisco. She has production experience at Stripe (senior engineer on Data Platform and Notebooks) and significant internship pedigree across Facebook, Google, and venture-backed teams from Waterloo. Bonnie is an active open-source contributor to performance-sensitive C++ projects—most notably work on Facebook’s fizz, mvfst, and proxygen—where she implemented threading and async I/O updates, QUIC/TLS error handling, and richer HTTP/3 logging and qlog support. She combines deep protocol-level engineering (TLS 1.3, QUIC, HTTP/3) with practical product delivery on data tooling, evidencing both low-level crypto/networking skills and platform design. Colleagues describe her as someone who surfaces subtle implementation issues early—she’s fixed replay cache threading and ECH serialization gaps that are easy to miss in large codebases. Trained at the University of Waterloo, she brings a disciplined, systems-oriented approach to shipping robust, observable infrastructure.

10 years of coding experience

Github Skills (19)

asynchronous10

c-language10

tls1210

async10

http10

proxy10

tls1310

mtls10

fileio10

cryptography10

quic10

libtls10

file-handling10

file-processing10

logging10

Programming languages (3)

C++CJavaScript

Github contributions (5)

facebook/mvfst

May 2019 - Nov 2020

An implementation of the QUIC transport protocol.

Role in this project:

Back-end Developer

Contributions:58 commits in 1 year 6 months

Contributions summary:Bonnie's contributions primarily involve updating the QUIC transport protocol implementation. They modified existing code by updating transport error codes to align with IETF standards and changing syntax. The user also handled TLS alerts and converted them into QUIC connection errors, while also adding string formats for frames and version types. Furthermore, they implemented methods for setting up the stateless reset token.

quic

facebookincubator/fizz

Sep 2020 - Dec 2020

C++14 implementation of the TLS-1.3 standard

Role in this project:

Back-end Developer

Contributions:61 commits in 3 months

Contributions summary:Bonnie implemented threading model updates for the replay cache functionality, including file modifications related to the SlidingBloomReplayCache. The changes involved updating threading models and incorporating new libraries related to asynchronous I/O operations within the `fizz` codebase. Further modifications included the addition of functions related to the serialization and deserialization of ECH (Encrypted Client Hello) structs and support functions. Additional changes included the addition of DH-based KEM encryption functions, adding functions to the cryptographic context for the encryption and decryption primitives.

tlscppssltls13

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