Pierre Habouzit - Distinguished Software Engineer at Apple

Pierre Habouzit

Distinguished Software Engineer at Apple

Mountain View, California, United States

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Summary

🤩

Rockstar

🎓

Top School

Pierre Habouzit is a Distinguished Software Engineer with 20 years of experience focused on performance, system programming and low-level concurrency frameworks, currently leading efforts at Apple. He is a C expert with deep expertise in asynchronous, event-driven and wait-free algorithms, and a proven track record improving multicore concurrency—co-maintaining libdispatch (Grand Central Dispatch) and contributing fixes that hardened signal handling and epoll-based event loops. Pierre’s background spans distributed systems, compilers and language theory, informed by advanced studies in semantics and proofs, which gives him a rare blend of formal rigor and production-grade engineering. He has a history of impactful open-source contributions to notable projects like swift-corelibs-libdispatch, tig and the awesome window manager, and a career path from research (INRIA, PhD work) to technical leadership roles at Apple and Intersec. Colleagues rely on him for subtle bug fixes and architecture decisions that improve throughput and correctness under contention—often addressing issues few others notice.

20 years of coding experience

20 years of employment as a software developer

M. Sc Semantics Proofs and Languages, M. Sc Semantics Proofs and Languages at Université de Paris VII - Jussieu

M.Eng Computer Science, M.Eng Computer Science at École Polytechnique

MPSI/MP*, MPSI/MP* at Lycée du Parc

English, French

Stackoverflow

Stats

690reputation

108kreached

8answers

0questions

Github Skills (25)

git10

libev10

system-programming10

linux10

c1110

c1710

epoll10

window-management10

concurrency10

ncurses9

tui9

multithreading9

lua9

xorg9

swift8

Programming languages (7)

C++CLLVMPHPLuaVim scriptVim Script

Github contributions (5)

swiftlang/swift-corelibs-libdispatch

Dec 2015 - Jun 2020

The libdispatch Project, (a.k.a. Grand Central Dispatch), for concurrency on multicore hardware

Role in this project:

Back-end Developer

Contributions:2 reviews, 329 commits, 206 PRs in 4 years 6 months

Contributions summary:Pierre primarily focused on improving the `swift-corelibs-libdispatch` project, specifically addressing issues related to concurrency and dispatch queues. Their work involved fixing bugs, reordering vtable entries, and ensuring the proper functioning of signal sources on Linux systems. Key contributions include correcting double-fires of signal sources and optimizing the `dispatch_once` function, along with fixes around event handling with the epoll library.

dispatchpatchgrand-central-dispatchconcurrencymulticore

jonas/tig

Jun 2010 - Sep 2011

Text-mode interface for git

Role in this project:

Backend Developer

Contributions:7 commits in 1 year 3 months

Contributions summary:Pierre primarily contributed to the core functionality of the `tig` repository, a text-mode interface for git. They implemented new commands like `scroll-first-col`, added keybindings for common actions, and modified existing functionality to align with user needs. The user also added an option to ignore unknown directories contents and modified the code to get author initials. Their contributions involved direct modification of the C codebase.

git-clientlibgit2emacstuincurses

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