Web platforms
Symfony applications that carry a business: portals, order flows, integrations with the systems around them. Boring technology, long lifetimes, measured deploys.
Sjoerd Maessen
Twenty years of building web platforms. Now I teach agents to run them.
Founder of En Masse, a web agency in Breda, the Netherlands. Building for the web since 2006. Today most of my days go to AI agents and the platforms they work in.
Scroll, poke the laptop, or .
What I build
Three things, done properly.
AI agents
Agents that do real office work: read mail, write minutes, review pull requests, answer the team. Each one runs on our own infrastructure with a local model where it can.
Crypto payments
Payment flows and node infrastructure for crypto. Wallets, settlement, monitoring, and the operations work that keeps a node online.
Proof
Things you can check.
- Certified back when that was a thing: Zend (2010), Magento (2013, 2014). The certificates are real; so is the lasting respect for anyone who runs a Magento shop. The post about the Zend exam is still online.
- Nineteen blog posts from 2009 to 2016, still on their original URLs in the archive. The code is from that era. Read it as history, not as advice.
- This site: static files, no PHP, no CMS, no form. The character at the desk is the only thing that runs.
Now
What I am working on.
- A family of agents (Mees at the office, Charles at home) that share one architecture and one review pipeline.
- A code review bot that reads every pull request before a human does.
- This site: a static one-pager with a character that reacts to you.
Contact
Talk to me.
No form. Send a mail, or find me on LinkedIn and GitHub.