The Good Reviews on Glassdoor are written by HR - Mitarbeiter (anonym) bei Minerva Networks: Mitarbeiterbewertung

You should probably be aware that any good reviews are likely written by HR in hopes of hiring others to replace those lost by the very high turnover rate. Excessive outsourcing to avoid paying Bay Area compensation rates. Dishonest management. Do not believe anything you are told unless it is in a legally signed document.