Jezen Thomas
Co-Founder & CTO at Supercede
London, England, United Kingdom
Summary
🤩
Rockstar🎓
Top SchoolJezen Thomas is a Co-Founder and CTO with 11 years of software engineering experience, currently leading Supercede to modernize reinsurance through pragmatic technical product development. He is a specialist in typed functional programming (Haskell and Elm), bringing rigorous type-driven design to backend systems and API-first architectures. Jezen has hands-on open-source experience contributing security, form-handling, and SEO improvements to the widely used Yesod Haskell web framework, showing attention to both developer ergonomics and web best practices. His career spans fintech and product startups across London and Europe, blending early-stage startup scrappiness with production-grade engineering. Colleagues value his combination of founder-level strategic thinking and deep code-first craftsmanship that surfaces subtle security and UX improvements.
11 years of coding experience
7 years of employment as a software developer
The SagebTec National Diploma, Music Performance, General, bTec National Diploma, Music Performance, General at Newcastle College
English, Polish, Swedish
Stackoverflow
13,670reputation
3.0mreached
230answers
95questions
html
top-1%
php
top-5%
internet-explorer
top-1%
css-animations
top-5%
jquery
top-5%
javascript
top-1%
Github Skills (21)
javascript10
css10
yesod10
html10
internet-explorer10
haskell10
jquery9
wordpress9
sass9
php9
css-animations9
content-security-policy8
sec8
opengraph7
browser-detection6
Programming languages (13)
Github contributions (5)
yesodweb/yesod
Jul 2019 - Mar 2020
A RESTful Haskell web framework built on WAI.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:17 reviews, 8 commits, 34 PRs in 8 months
Contributions summary:Jezen primarily contributed to the `yesodweb/yesod` framework, focusing on form handling and security. They implemented functionality to improve user experience with form validation messages, specifically `mreqMsg`. Furthermore, they moved JavaScript form submission from the `onload` HTML attribute into a `<script>` tag, enhancing security practices. The user also added features for setting meta tags for SEO optimization.
haskellrestrestfulweb-framework
SupercedeTech/yesod-auth-simple
Dec 2018 - Apr 2022
Traditional email/pass auth for Yesod.
Contributions:4 reviews, 52 commits, 20 PRs in 3 years 4 months
authe-mailyesod
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