Sébastien Castiel
Senior Software Developer at Vasco
Montreal, Quebec, Canada
Summary
🤩
Rockstar🎓
Top SchoolSébastien Castiel is a Senior Software Developer based in Montreal with 11 years of experience building and leading frontend and full-stack teams across finance, fintech, and consumer products. He combines hands-on engineering (React, Next.js, Rails, Java) with coaching—running workshops, mentoring developers, and authoring five books on frontend development. His background includes leading client-data and real-time trading features at Wealthsimple and Adaptive Financial Consulting, and contributing to a modular web/mobile framework at National Bank of Canada. Now at Vasco, he continues to bridge product and engineering while offering practical training that helps developers ship their first React & Next.js apps. Outside work he channels curiosity into continuous learning and long hikes across Quebec, a habit that informs his patient, persistent approach to mentorship and problem solving.
11 years of coding experience
11 years of employment as a software developer
Engineer’s Degree Computer Science, Engineer’s Degree Computer Science at INSA Rennes
English, French
Stackoverflow
166reputation
8kreached
9answers
1question
Github Skills (194)
authentication10
fyne10
shadcn-ui10
javascript10
jwt10
draft-js10
tailwindcss10
text-editing10
documentation10
contenteditable10
reason-react10
open-source10
nextjs10
oauth10
react10
Programming languages (16)
Github contributions (5)
spliit-app/spliit
Dec 2023 - Dec 2024
Free and Open Source Alternative to Splitwise. Share expenses with your friends and family.
Contributions:18 releases, 21 reviews, 96 PRs in 1 year
nextjsreactshadcn-uisplitwisetailwindcss
scastiel/livre-react-exemples
Jul 2018 - Feb 2019
Les exemples associés au livre « Des applications modernes avec React » https://leanpub.com/apps-web-modernes-react
Contributions:30 commits, 23 pushes, 2 branches in 6 months
reactlivreleanpubdesweb-apps
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