Looking at their process objectively:
1. HR Admin left voicemail to book interview, but left no return phone number. 1-2 Hours spent trying to track her down via Linkedin/Swiss Port Switchboard.
2. Arrival on the day, no security in building - Just walked in. No facility to guide visitors. Had to wander to a desk and ask for help.
3. Interview was well structured / Interviewers were friendly.
4. No response afterwards. Nothing. I followed up with a thank you email which fell on stony ground. After several weeks asked for feedback, again no response.
In general, it seems processes and professionalism are fairly low down on their priorities. Perhaps a lucky escape.