Sartorius Engineering Intern interview questions

Unprofessional hiring process. Wastes candidate's time and effort. Not a single response from anyone involved in hiring. The process was a single interview with a manager and another engineer. I asked about the rest of the interview process, if I moved on through to the next step, and they said there would be a second interview with the boss. BUT they ghosted me after the interview. NO follow up from either the manager or the engineer. NO follow up from the recruiter who set up the interview. Not even an automated email from the hiring platform they use. Completely unprofessional.