Rex Mcconnell
Senior Software Engineer at Proof
Ottawa, Ontario, Canada
Summary
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Rockstar🎓
Top SchoolRex Mcconnell is a Senior Software Engineer based in Ottawa with around 14–15 years of hands-on experience building and modernizing large-scale web applications. He has led multi-year migrations from legacy Ruby on Rails stacks to TypeScript and React frontends backed by GraphQL at companies like Shopify and Instacart, while mentoring teams and improving observability and performance. Rex combines front-end performance engineering—using tools like Lighthouse CI, Puppeteer, Datadog RUM, and SpeedCurve—with pragmatic backend work on APIs and microservices. He excels in cross-functional collaboration with product and UX teams and in running engineering rituals that level up junior developers. Comfortable both remote and on-site, he has a consistent track record of cutting load times, containerizing deployments, and shipping reliable consumer-facing features. Colleagues would describe him as a forward-thinking mentor who prefers teams that prioritize learning, initiative, and measurable technical improvements.
14 years of coding experience
17 years of employment as a software developer
Bachelor of Science (BS) Computer Science, Bachelor of Science (BS) Computer Science at The University of Texas at Dallas
Stackoverflow
1,614reputation
601kreached
18answers
0questions
special-characters
top-5%
jquery
top-5%
Github Skills (45)
shopify-api10
design-tokens10
shopify10
typescript10
vscode-extension10
figma-plugin10
cjs10
component-library10
react-modal10
react10
jquery9
special-characters9
watchface8
javascript8
code-behind8
Programming languages (4)
Github contributions (5)
rkowert/rkowert.com
Oct 2019 - Mar 2022
Contributions:2 PRs, 23 pushes, 2 branches in 2 years 4 months
rexmac/pebble-chronocode
Dec 2013 - Aug 2015
Contributions:47 commits, 3 PRs, 6 pushes in 1 year 7 months
pebblepebble-smartwatchwatchfacesmartwatch
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