Benoit Daloze
Senior Software Engineer at CRuby
Zurich, Zurich, Switzerland
Summary
🤩
Rockstar🎓
Top SchoolBenoit Daloze is a Senior Software Engineer with 16 years of experience specializing in virtual machines, JIT compilers and making dynamic languages—especially Ruby—thread-safe, scalable and high-performance. As lead contributor to TruffleRuby and a long-standing Ruby committer, he combines deep research (PhD work on VMs and concurrency) with hands-on engineering across GraalVM, JRuby and core Ruby projects. He has a strong track record improving test suites, CI compatibility and thread-safety across major Ruby ecosystems (ruby/spec, concurrent-ruby, Bundler, Rails and Puma). Now working on the Ruby profiler at Datadog, he brings rare expertise in low-level VM internals and benchmarking that directly translates to production observability and runtime performance gains. An understated strength is his habit of stabilizing flaky tests and CI across diverse Ruby engines, a practical skill that repeatedly improves reliability at scale.
16 years of coding experience
7 years of employment as a software developer
Doctor of Philosophy - PhD, Computer Science, Doctor of Philosophy - PhD, Computer Science at Johannes Kepler Universität LinzMaster's Degree, Computer Science, Master's Degree, Computer Science at Université catholique de Louvain
French, English
Stackoverflow
1,496reputation
257kreached
11answers
2questions
travis-ci
top-5%
Github Skills (102)
dependency-management10
benchmark10
parser10
python10
graalvm10
multithreading10
package-management10
utf10
testing10
c1110
cffi10
ruby10
opal10
c1710
javas10
Programming languages (23)
Github contributions (5)
ruby/spec
Apr 2012 - Jan 2023
The Ruby Spec Suite aka ruby/spec
Role in this project:
Back-end Developer
Back-end DeveloperContributions:314 reviews, 2919 commits, 753 PRs in 10 years 11 months
Contributions summary:Benoit contributed to the Ruby Spec Suite (ruby/spec) by implementing and refactoring various tests. Their work focused on expanding the test suite, improving the test coverage, and ensuring better accuracy across different Ruby versions. The user's contributions involved modifying test cases and test-related fixtures, demonstrating a focus on enhancing the testing infrastructure for the Ruby programming language. They also refactored some of the specs to avoid deprecated functionalities.
ruby-gemmspecrailsrubyspec
ruby/setup-ruby
Jan 2020 - Jan 2023
An action to download a prebuilt Ruby and add it to the PATH in 5 seconds
Role in this project:Backend Developer
Backend DeveloperContributions:227 releases, 193 reviews, 411 commits in 3 years 1 month
Contributions summary:Benoit primarily worked on the core functionality of the action to download and set up Ruby environments. They refactored the code, extracted functions for improved maintainability, and added support for new Ruby versions. The user's work extended to handling different platforms, including Windows, and they integrated with the GitHub Actions environment by interacting with tool-cache functionalities.
ruby-actionrailsprebuilt-rubymriruby
Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.