Award-winning JavaScript and Web Performance consultant

Teaching the next generation of ambitious developers.

Web Consultant

Based in Amsterdam, I consultant (hourly and daily options) on Web Performance and PWA.


Tech Speaker

I speak at tech conferences and private companies around the world about the Web.



I teach full stack development to 700+ students in Amsterdam as well as more than 50,000 online.

Trusted by

and other companies such as IKEA & MediaMarkt

Featured in

El Pais Smashing Magazine MTV Sitepoint


I'm humbled to be awarded for my continuous community engagements

Recent & upcoming talks

Secrets of native-like PWAs

Presented at Microsoft Ignite
Location: Amsterdam, the Netherlands
Date: March, 2019

Introduction to Service Workers

Presented at Google Poland
Location: Warsaw, Poland
Date: June, 2019

Secrets of native-like PWAs

Presenting at Fronteers
Location: Amsterdam, Netherlands
Date: October, 2019

Secrets of native-like PWAs

Presenting at CodeMotion.
Location: Berlin, Germany
Date: November, 2019

Speaking events

I’ve inspired audiences around the world. Book me to speak at your conference in 2021.

Products I've built

Learn Programming

The easiest way to learn Programming concepts for absolute beginners step by step

React Tutorial

The easiest way to learn React. Understand how React works not just how to build with React.

Learn JavaScript

Learn & practice modern JavaScript step by step with this interactive online course.


Webdash helps you visualize, monitor & manage your web project using community-driven plugins.

Code To Go

Code To Go helps you find up to date snippets for common JavaScript use cases.

Top YouTube video

Articles I've published

JavaScript forEach - the complete guide

The complete guide for Array.forEach in JavaScript. Learn how to iterate over arrays and retrieve the index.

JavaScript hasclass using classList.contains

Learn how to check if an element has a class or not using the modern alternative with classList.contains.

Build A PWA With Webpack & Workbox

This tutorial will help you transform an app that doesn’t work offline into a PWA that works offline and shows an update available icon.

Smashing magazine

How to get more clients as a freelancer

Learn practical tips that will help you get more clients as a freelance developer while earning more. Kickstart your freelance career in 7 steps.


A 5 minute intro to Workbox 3

Workbox is a collection of JavaScript libraries that help you with service worker related functionalities when you’re building Progressive Web Apps.


Running fetch in a web worker

An explainer for Web Workers and Comlink using fetch as an example Web API. Serves as an intro for Web workers.

Google Developer Experts

Get in touch

I'm available for contractual work related to front-end, Web Performance & Progressive Web Apps as well as delivering inspirational keynotes for companies.

Important: For questions related to one of my courses,
please use the contact page instead.