Julian Calleja
Technical Lead at HubSpot
Stony Stratford, England, United Kingdom
Summary
👤
Senior🎓
Top SchoolJulian Calleja is a Technical Lead with 11 years of full-stack web development experience, currently leading engineering at HubSpot after progressing through senior and lead roles at Better.co.uk. He specializes in front-end systems and product-focused architecture, driving conversions and UX improvements using technologies like Next.js, Gatsby, GraphQL and Node.js. A hands-on mentor, he builds inclusive teams, champions A/B testing, SEO and accessibility, and ensures clean, well-tested code that scales. Notably, he has led partnerships (eg. Monzo integration) and built features that measurably reduced acquisition costs and improved signup conversion through innovations like passwordless magic links. Based in Stony Stratford, he combines practical product sense with deep front-end expertise and experience coordinating distributed teams and cross-company initiatives.
11 years of coding experience
9 years of employment as a software developer
Bachelor's degree Computer Science Engineering, Bachelor's degree Computer Science Engineering at Universidad Complutense de Madrid
Spanish, English
Stackoverflow
15reputation
2kreached
0answers
2questions
Github Skills (85)
testing10
automation10
nike10
javascript10
umbrella10
chromium10
ellipsis10
react-component10
firefox10
api10
testcafe10
performance-optimization10
developer-tools10
js-api10
node-module10
Programming languages (4)
Github contributions (5)
jucallej/Do-I-need-an-Umbrella
Oct 2019 - Apr 2021
Do I need an Umbrella
Contributions:95 commits, 388 PRs, 482 pushes in 1 year 7 months
reactjavascriptnotificationsumbrellanodejs
jucallej/hook-click-outside
May 2019 - Nov 2019
React hook to detect clicks outside a node
Contributions:14 pushes in 5 months
reactclicksreact-hooksdetectoutside
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