Simon Mathieu
Head Of Engineering at Tangible
California, United States
Summary
🤩
Rockstar🎓
Top SchoolSimon Mathieu is a seasoned engineering leader with 16 years of experience building and scaling product and teams at companies like Shopify, Lookout, Rainforest QA and Twitter, and is currently Head of Engineering at Tangible. He combines deep hands-on back-end expertise in Ruby/Rails and distributed systems—evidenced by contributions to high-impact open-source projects such as Shopify's app engine and the QueueClassic worker queue—with proven people and product leadership across messaging, security, and QA domains. As an early hire and engineering lead at startups he built core infrastructure from the ground up, and he’s comfortable shifting between writing production code and running cross-functional roadmaps. Now taking a short break from full-time work, he’s selectively available for advisory, consulting, or full-time roles focused exclusively on climate tech. Colleagues know him for pragmatic technical refactors that improve robustness and testability, and for turning tough infra problems into measurable operational gains.
16 years of coding experience
14 years of employment as a software developer
I.B. Natural Sciences, I.B. Natural Sciences at Petit Séminaire de Québec - Campus de l'ouest du QuébecBacc Computer Engineering, Bacc Computer Engineering at Université de Sherbrooke
English, French
Stackoverflow
141reputation
4kreached
1answer
3questions
Github Skills (18)
ruby-rails10
postgresql10
apidoc10
shopify10
testing10
rails10
queuing10
ruby10
api10
queue10
concurrency9
activerecord6
database6
ruby-on-rails6
go6
Programming languages (8)
Github contributions (5)
QueueClassic/queue_classic
Feb 2015 - Jul 2019
Simple, efficient worker queue for Ruby & PostgreSQL.
Role in this project:
Back-end Developer & QA Engineer
Back-end Developer & QA EngineerContributions:18 commits, 12 PRs, 14 pushes in 4 years 5 months
Contributions summary:Simon focused on improving the robustness and testability of the `queue_classic` project. Their contributions included making the connection adapter thread-safe, adding unit tests for multi-threaded server scenarios, and improving benchmark tests. They also implemented functionality to count scheduled vs ready jobs, providing better insight into queue management. Additionally, they updated the gemspec and version to reflect the latest project state.
postgresqlrubyactivejobqueuing
Shopify/shopify_app
Dec 2019 - Sep 2020
A Rails Engine for building Shopify Apps
Role in this project:Back-end Developer
Back-end DeveloperContributions:2 reviews, 15 commits, 6 PRs in 9 months
Contributions summary:Simon primarily contributed to the Shopify app's back-end functionality. They removed dependencies such as dotenv and addressed PR comments. Furthermore, the user updated the Shopify app version, refactored the login protection module, and refactored the storage access module. The user also added a new marketing activity extension.
rails-enginesshopify-app
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