Guilherme O'connor
Front End Developer Contractor at Guioconnor LTD
London, England, United Kingdom
Summary
👤
Senior🎓
Top SchoolGuilherme O'connor is a versatile Front End Developer and architect with 16 years of professional experience and a 23-year background in web and software development informed by studies in Architecture and Computer Science. He has led front-end architecture and teams at startups and scale-ups (Snupps, JustGiving, FundApps) and delivered consultancy for large organisations including Yahoo! and HMCTS, with a consistent focus on React-based product builds, UI architecture and frontend modernization. Comfortable across the stack, he pairs deep technical skills—DSL parsers, legacy platform adaptations and front-end consolidation—with strong design sensibilities from his architecture and photography background. He’s fluent in four languages, a seasoned mentor who restructures teams and practices, and an advocate for testing, accessibility and usable, SEO-friendly interfaces. Notably, his career spans unusual intersections—from prototype mobile firmware at Sony Ericsson to lecturing compiler design—reflecting a systematic, pragmatic approach to problem solving and a taste for conceptual and visual elegance. Based in London, he runs Guioconnor LTD and consults on front-end architecture while continuing to ship production web applications.
16 years of coding experience
17 years of employment as a software developer
Architecture, Architecture at USP - Universidade de São PauloGrad Courses, Computer Science, Grad Courses, Computer Science at Universidade Estadual de Campinas
English, Spanish, Portuguese, Italian, French
Stackoverflow
414reputation
122kreached
11answers
2questions
Github Skills (90)
rendering10
credentials10
1password10
react-dom10
ssh-agent9
ssh9
react9
passwordless9
javascript8
yubikey8
frontend8
automation7
uri7
lint7
url-parser7
Programming languages (10)
Github contributions (5)
Geoxa/geoxa.github.io
Mar 2016 - Dec 2021
Contributions:48 pushes, 2 branches in 5 years 10 months
guioconnor/colorclock
Sep 2015 - May 2023
A clock that uses a color based representation of time. Differently from other clocks, this one covers the full RGB spectrum.
Contributions:8 PRs, 16 pushes, 6 branches in 7 years 9 months
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