Good starting point - Mitarbeiter (anonym) bei Terracon: Mitarbeiterbewertung

Office management, employees, and work schedule.

Corporate micro management of branches

You have sustainable hours for construction but there is mandatory overtime (The most I’ve done is 51 hours in a week), they pay you enough to live on, it’s good experience, upper management pays lip service to workers rights, there is genuine concern and regulation from management to provide you an emotionally and physically safe place to work, you’re never really rushed to do your job, and you do have the right to stop work

You need a degree in engineering or geology to move up and you have to threaten to move offices or take another job to get a pay raise. It’s not unionized.