Liam O'Brien
Full-Stack EngineerEmail:liam@shopify.com
Phone:+1 416 555 0139
Location:Toronto, Canada
Professional Summary
Full-stack engineer with 4 yrs at Shopify. Shipped features used by 2M+ merchants globally. Known for clear communication, ownership, and shipping measurable outcomes. Combines strong software fundamentals with cross-functional collaboration and a bias for execution.Experience
Jan 2022Present
Senior Developer
Shopify · Toronto
• Rebuilt admin analytics module in React + Rails; +38% adoption• Led migration to modular federated storefront; -42% bundle size
• Wrote 6 RFCs adopted org-wide
• Improved CI cycle time from 23m to 13m
• Owned critical services at Shopify; improved p95 latency by 43%
Jan 2017Dec 2020
Software Engineer
Acme Cloud · Singapore
• Owned critical services at Acme Cloud; improved p95 latency by 20%• Led migration of 3 services to modern stack with zero downtime
• Mentored 2 engineers; 1 promoted within a year
• Reduced production incidents 15% via better observability and runbooks
• Partnered with product to ship 2 high-impact features used by 40k users
Skills
Ruby on Rails, React, TypeScript, GraphQL, PostgreSQL, Kafka, Kubernetes, TypeScript, React, Node.js, PostgreSQL, AWS, Docker, Kubernetes, CI/CDProjects
Developer Experience Toolkit (Shopify)
TypeScript, React, Node.js, PostgreSQL, AWS
• Documented learnings reused by peer teams
• Recognized in team/org review for execution quality
Data Sync Pipeline
TypeScript, React, Node.js, PostgreSQL, AWS
• Documented learnings reused by peer teams
• Recognized in team/org review for execution quality
Platform Reliability Upgrade
TypeScript, React, Node.js, PostgreSQL, AWS
• Documented learnings reused by peer teams
• Recognized in team/org review for execution quality
Developer Experience Toolkit (Shopify)
TypeScript, React, Node.js, PostgreSQL, AWS
• Documented learnings reused by peer teams
• Recognized in team/org review for execution quality
Education
B.Sc, Software Engineering
University of Waterloo
Waterloo
Co-op program