Applied via employee referral. Process is simple: An online test than no response for 1 month, than the HR wakes up from hibernation and schedules a call with one of the engineer. This is followed by 1 month of hibernation again after which they'll schedule back to back 3-5 rounds of 45 mins each. This is again followed by hibernation. The difficult level is very easy. Just an advise for people looking to interview with zalando: Please be prepared to not hear from HR even when you're selected. Rejecting the offer only because the HR is unresponsive.

I made 3 Rounds, first a classical HR nterview-then a live coding (somthing like binary search) then a system design (design an inventory system) tehy told me that I didn't pass at the system design level( ishould asked for the number of clients not to make assumptions