I worked for Wirecard in ~2017. Now that the company is no more I guess I'm free to talk about it.
Wirecard is without a doubt the worst company I worked for. Nevermind the legacy ball of mud, the whole work environment was toxic. Blaming, finger pointing, sexist and racist remarks weren't rare. This is the only company where I've seen people screaming out of their lungs and slamming doors during meetings.
Back in the day I used to think Wirecard was a living example that you don't need a good tech stack or working enviroment to be a successful company.... oh boy was I wrong.