Hi, i am Jeroen Wiersma

If you want to learn about client-side A/B test development you are in the right place!

Click the button below to learn about my JavaScript for Optimizers course!

What do people say about me?

Ana Catarina
CRO Coordinator
I must say your content is awesome. Just wanted to say thanks so much.
Panagiotis Stamoulis
Growth Experimentation Engineer
Finally, someone who codes something more complex than changing a title.
Sander Volbeda
Freelance CRO Specialist
Great course, I learned all the basics to get started with using JS for your experiments.

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