Because of financial structure,proper managing stratergy, great compensation,great financial payment.
Bad maitainance , not so sufficent locations, unstable propositions.
Advice to Management
I will adivce that they should have more locations and a better propositions.
I applied online. I interviewed at Badoo (Moscow (Russia)) in May 2017.
I applied in a Moscow mobile engineering recruiting event when you could go to the interview after online quiz in Hackerrank. After it, they invited people to a Moscow Badoo office. There are a series of interviews in 30-60 minutes each: platform, computer science, system design. All interviewers were very nice and competent. In one part I wrote parts of code in the paper, in other they used a whiteboard for system model's design.
The worst part of this interviews was organization. I passed in their building about 8 hours and only 2 of them were occupied by interviews, in the remaining time I just waited for the remaining parts - and they postponed every hour. I was completely exhausted by the waiting in the end.