Matthew Valentine-house
Software Engineer at Shopify
Canterbury, England, United Kingdom
Summary
🤩
Rockstar🎓
Top SchoolMatthew Valentine-house is a seasoned software engineer with 16 years of experience building scalable web platforms, currently contributing to the Ruby core and Shopify’s Ruby Infrastructure team with a focus on memory allocation and garbage collection. He blends deep Ruby expertise—evidenced by commits to MRI and TruffleRuby and several popular open-source Ruby libraries—with strong systems, networking and DevOps knowledge from roles spanning startups to high-traffic production sites. Matthew has led teams and data initiatives at FutureLearn, architected service-oriented Ruby applications at OnTheBeach, and driven reliability improvements through CI/CD and configuration management. He holds an MSc in Broadband and Mobile Communications Networks and a BEng in Computer Systems Engineering, giving him an uncommon appreciation for low-level internals alongside application design. Pragmatic yet craft-focused, he champions test-driven and emergent design while knowing when to bend the rules to deliver robust, maintainable systems.
15 years of coding experience
10 years of employment as a software developer
Bachelor of Science (BS), Computer Systems Engineering, 2:1 (Hons), Bachelor of Science (BS), Computer Systems Engineering, 2:1 (Hons) at University of Kent
Github Skills (17)
graalvm10
macros10
memory-management10
c1110
ruby10
c1710
truffle10
garbage-collection10
programming-language9
java9
object-oriented-programming9
build-automation9
javas9
jit8
testing8
Programming languages (10)
Github contributions (5)
ruby/ruby
Oct 2019 - Apr 2025
The Ruby Programming Language
Role in this project:
Back-end Developer
Back-end DeveloperContributions:62 reviews, 261 PRs, 68 pushes in 5 years 6 months
Contributions summary:Matthew primarily contributed to the Ruby programming language implementation, specifically focusing on the garbage collection (GC) system. Their work involved fixing GC-related bugs and enhancing its capabilities. They also added and modified various macros, demonstrating a deep understanding of the language's internal workings and memory management. The commits show a focus on improving the stability and performance of Ruby's core.
object-orientedruby-languageprogramming-languagerubyc
oracle/truffleruby
Dec 2019 - Dec 2019
A high performance implementation of the Ruby programming language, built on GraalVM.
Role in this project:Back-end Developer
Back-end DeveloperContributions:5 commits, 1 comment in 7 days
Contributions summary:Matthew primarily contributed to the TruffleRuby project by enhancing its build process and core functionalities. They added the kernel major version to the `RUBY_PLATFORM` constant and updated the build to trigger rebuilds when the kernel version changes, ensuring compatibility. Further work involved adding kernel version information to the BuildInformation and integrating a spec to validate that the platform string contains the kernel version, refining the build and runtime environment for the Ruby implementation.
trufflerubyperformancegraalvmjruby
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