Marc, Maxim, and Benjamin founded three of the startups that have defined "post-ecommerce" Berlin: SumUp has now over 1000 employees, door2door grew from one floor on Torstraße to four, and Offerista just acquired the market leader in Austria and is on it's way to becoming Europe's leading digital trade marketer. All of them have been practising Lean methods from the start - but do they still? How does Lean help when your company has several management levels and products, people, and processes that need maintenance and accountability, not constant innovation?