George Ma
Software Engineer at Cleo
Old Toronto, Ontario, Canada
Summary
🤩
Rockstar🎓
Top SchoolGeorge Ma is a software engineer with nine years of experience building backend systems, currently at Cleo after a multi-year tenure in Ruby on Rails infrastructure at Shopify. A University of Toronto computer science graduate based in Old Toronto, he has shipped production services across startups and large teams using Rails, Scala, Kafka, Docker, and AWS. George is an active open-source contributor to high-profile projects like rails/rails and rubygems.org, where he’s fixed edge-case ActiveJob and ActiveRecord bugs and modernized authentication flows to TOTP. He brings a pragmatic focus on code quality and reliability—often surfacing subtle regressions and restoring critical behaviors—while enjoying the cross-cutting challenges of infrastructure and platform engineering.
9 years of coding experience
6 years of employment as a software developer
High School Diploma + IB Certificates, High School Diploma + IB Certificates at White Oaks Secondary SchoolBachelor of Science (B.Sc.), Computer Science, Bachelor of Science (B.Sc.), Computer Science at University of TorontoBachelor of Science (B.Sc.), Computer Science, Bachelor of Science (B.Sc.), Computer Science at University of Toronto - University College
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (18)
ruby-rails10
testing10
user-authentication10
authentication10
rails10
ruby10
activerecord10
totp10
ruby-on-rails10
rubygems9
application-framework9
integrations9
app-framework9
package-manager-tool9
emailjs9
Programming languages (5)
Github contributions (5)
rails/rails
Apr 2023 - Mar 2025
Ruby on Rails
Role in this project:
Back-end Developer
Back-end DeveloperContributions:1 review, 6 PRs, 8 comments in 1 year 11 months
Contributions summary:George contributed to the Ruby on Rails framework by addressing specific issues and improving code quality. They focused on module delegation, adding necessary namespaces for improved functionality. They also worked on memoization of `queue_adapter_for_test` and added regression tests for a memoized queue adapter within the ActiveJob component. Furthermore, the user addressed a bug related to the `ActiveRecord::Result` column types and extended the `ActiveModel::BigInteger` class by restoring the `max_value` functionality.
ruby-on-railsrailsframeworkrubymvc
rubygems/rubygems.org
Jul 2023 - Aug 2023
The Ruby community's gem hosting service.
Role in this project:Back-end Developer
Back-end DeveloperContributions:12 reviews, 4 PRs, 17 comments in 1 month
Contributions summary:George primarily focused on refactoring and updating the RubyGems.org mailer system to use Time-Based One-Time Passwords (TOTP) instead of Multi-Factor Authentication (MFA). Their contributions included renaming methods, updating email templates, and modifying tests to reflect the TOTP changes. Additionally, the user made adjustments to settings views and controller logic, ensuring the smooth transition and correct behavior of the authentication system.
ruby-on-railshostingrubygemsrailsruby
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