The company invests in employer branding way more than employees themselves. Unfortunately, they hire a lot of talents and then lay other talents off. You can usually hear of a couple of people from different departments that suddenly left the company, and recently, the company has been recently posting more part time and student jobs than before.
The are gradually taking benefits away. We used to have a week off called trivacation but they decided to cancel it this year!
Career progression is very limited. The average team lead is leading a team of only 3 or 4. In a small company as trivago, this ratio doesn't make sense.
Onboarding was very basic.