I had the privilege of being in the "future CMO" Program of Rocket Internet and scaling foodora from €1 m to €500 m revenue. At that time, Rocket Internet was known as the World Champion in Online Marketing.
Since then, I've translated all my learnings into the Growth Science Method and making them available to you to unlock 2-3x growth for your business.
This means you don't need to do all the mistakes yourself, but you can stand on shoulders and shortern your learning curve massively.