A/B Testing at Scale
29 live experiments across 6 client brands, all running through one home-built GrowthBook environment with live Chrome-extension preview, automated scaffolding, and CI-grade dependency auditing.
reboot. rethink. recoveryArea.
Front-end engineering for teams that ship experiments.
Hello! I’m Pascal, a creative, resourceful and innovative Front End Developer / UX Optimizer from Enschede. I’m the guy you need to make your website interact, perform and convert better—through precise experimentation and performance engineering that actually moves the needle.
It’s my pride and passion.
- 300+ Experiments shipped A/B and personalization, two decades and counting
- 23 Years of recoveryArea Front-end consultancy since 2003
- 29 Markets on one test Single live experiment, ground-truth-verified per locale
- 6 Active clients All running on a home-built GrowthBook stack
What I do
I specialize in high-velocity experimentation platforms: GrowthBook, Optimizely, Convert, and Cloudflare. Building testing architectures that scale isn’t just about handling traffic—it’s about creating frameworks where behavioral insights and technical performance work together to drive genuine conversion improvements.
Where I spend my time
Front-End Performance
Conversion is a performance discipline. Mutation observers that beat FOUC, intersection observers for honest viewport tracking, critical-path JS shaved until experiments stop hurting Core Web Vitals.
Tooling That Compounds
Twenty years of writing the unglamorous helpers that make the next ten experiments cheaper than the last: globals detection, smarter logging, bulletproof DOM injection, dependency guardians.
More writing
How To Detect User-Defined Window Globals with JavaScript (Enhanced)
An async, error-resilient globals detector: spins up an iframe baseline, categorises the diff by type, and lets you exclude known third-party noise.
Building the Ultimate A/B Testing Developer Experience
How a Vite hub, a Chrome extension that hijacks production scripts, and a WebSocket reload loop turned multi-client A/B testing into hot-reloadable dev work.
Building a Developer-Friendly Chrome Extension: Script Redirector with Live Reload
Inside MintMinds RequestLite: a Manifest V3 Chrome extension that redirects production script URLs to localhost and live-reloads tabs over WebSocket.
How To List User Defined Window Globals with Javascript
A tiny IIFE that compares window against a fresh iframe to list every user-defined global, grouped by type — handy for auditing third-party noise.
Even more posts
- javascript How to simulate clicks on non-supported HTML elements
- javascript Adding DOM Elements LIKE A BOSS
- javascript My Secret to Super Fast AB Test Loading
- javascript Notify Enter Viewport the proper way: Intersection Observer.
- ab-testing Notify Enter Viewport
- ab-testing AB Test jQuery Performance Cheat Sheet
- javascript Track That!
- javascript A smarter console.info