Mark Hamstra
Founder & Lead Developer at modmore
Leeuwarden, Frisia, Netherlands
Summary
🤩
Rockstar🎓
Top SchoolMark Hamstra is a founder and lead developer with 15 years of experience building and extending the MODX ecosystem through his company modmore and freelance work. He combines hands-on back-end PHP development and core contributions to the popular MODX Revolution CMS with product work on SiteDash.app and AlpacaMarkt.nl, shipping premium extensions and customer-facing support. As a long-time core contributor he’s improved multi-byte support, patched XSS issues and enhanced image handling in the MODX codebase, demonstrating a focus on stability and security. Based in Leeuwarden, Netherlands, he balances entrepreneurial responsibilities with technical delivery and occasionally takes on challenging consulting projects. He’s passionate about making web technology more accessible and brings a practical hospitality-rooted customer service mindset to developer support and product design.
15 years of coding experience
2 years of employment as a software developer
Foundation degree, International Hospitality Management, Foundation degree, International Hospitality Management at Stenden UniversityVoortgezet Wetenschappelijk Onderwijs (VWO), Voortgezet Wetenschappelijk Onderwijs (VWO) at RSG Tromp Meesters
Dutch, English, German, French
Stackoverflow
702reputation
69kreached
30answers
2questions
Github Skills (14)
cms10
php10
xss10
security10
utf8
image-manipulation8
caching6
modx-revolution6
code-snippets6
ipv66
ipv46
modx6
soap6
soap-client6
Programming languages (15)
Github contributions (5)
modxcms/revolution
May 2011 - Jan 2023
MODX Revolution - Content Management Framework
Role in this project:
Back-end Developer
Back-end DeveloperContributions:249 reviews, 718 commits, 529 PRs in 11 years 10 months
Contributions summary:Mark made several contributions focused on enhancing the MODX Revolution CMS, specifically addressing multi-byte character support, and improving the system's stability. They also worked on modifying the admin interface, and updated a PHP library related to phpThumb for image manipulation, improving the way images can be used in the CMS. Additionally, they made adjustments to core files and fixed a variety of XSS vulnerabilities.
modx-revolutionmodxphpcontent-managementcontent-management-system
modmore/Scheduler
Nov 2013 - Dec 2022
A general, abstract method of scheduling various tasks within MODX Revolution.
Contributions:44 commits, 4 PRs, 16 pushes in 9 years 2 months
modx-revolution
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