Petr Hosek
Staff Software Engineer at Google
Mountain View, California, United States
Summary
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Rockstar🎓
Top SchoolPetr Hosek is a seasoned toolchain and compiler engineer with 12 years of experience, currently leading the Fuchsia toolchain effort at Google and serving on the board of the Czech School of California. He designs and maintains complex build, test and release infrastructure for Clang/LLVM, GN and LUCI, and has a track record of shipping Fuchsia-specific compiler driver support, libc++ integrations and baremetal compatibility fixes in the upstream LLVM project. His background blends deep academic training (PhD, Imperial College London) and applied research in software reliability with hands-on systems work—porting C libraries, improving musl and PNaCl support, and resolving subtle build/test issues across platforms. An active open-source contributor, Petr’s commits often focus on cross-platform build systems and linker/LTO behavior that quietly improve performance and portability for widely used projects like LLVM and the Flutter engine.
12 years of coding experience
5 years of employment as a software developer
Doctor of Philosophy (Ph.D.), Computing, Doctor of Philosophy (Ph.D.), Computing at Imperial College LondonBachelor's Degree, Computer Science, Bachelor's Degree, Computer Science at Charles University in Prague
Czech, English
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (38)
c-language10
llvm10
build-system10
cmake10
c1110
c1710
compiler-design10
cplus10
build-automation10
rt10
build-tools10
fuchsia10
cpp10
clangd10
cprogramming-language10
Programming languages (13)
Github contributions (5)
llvm/llvm-project
Aug 2022 - Sep 2022
The LLVM Project is a collection of modular and reusable compiler and toolchain technologies.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:575 reviews, 3 commits, 311 PRs in 1 month
Contributions summary:Petr primarily contributed to the LLVM project by implementing and modifying compiler features, specifically related to the Clang front-end. Their work included adding and refining compiler flags, such as `-fseparate-named-sections`, to optimize code generation and linker behavior. Furthermore, the user introduced implementations for core standard C functions, such as `timespec_get` for better compatibility with baremetal environments and added functionality to provide and use a variety of I/O functions with baremetal applications. The changes spanned multiple files across the project, including header files, source code, and test configurations.
compilerstechnologiesclangsubmittoolchain
llvm-mirror/libcxx
Aug 2016 - Oct 2019
Project moved to: https://github.com/llvm/llvm-project
Role in this project:Back-end Developer / Build & Release Engineer
Back-end Developer / Build & Release EngineerContributions:79 commits in 3 years 2 months
Contributions summary:Petr primarily contributed to the build system and configuration aspects of the libcxx project, which is a C++ standard library implementation. Their work involved modifying CMake build files, including changes related to compiler-rt integration, handling of compiler flags, and installation paths. They also addressed issues with header installations and improved test configurations. These commits indicate a focus on improving the build process, supporting different platforms (Fuchsia), and ensuring the library integrates correctly with LLVM tools.
llvm
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