In the lead-up to Tech5 2017 – the annual competition organized by TNW and Adyen which celebrates Europe’s fastest-growing tech companies in the Netherlands, UK, Germany, Spain, France and Sweden – we’re launching a series of remarkable stories of businesses that experienced extreme growth. We asked these companies to tell us the data backed story on how key decisions were made, which growth hacks led to the much loved hockey stick curve, and how this impacted their company.