Initial interview process was straightforward but they don't ask you for your availability and just send you invites with no context containing an .ics file instead of a Google Calendar invite. I've never had a company not ask for my availability and I've interviewed with 100+ companies.
I received such an invite from a salesperson at the same time as an HR person after 2 interviews - usually HR is involved at the offer stage and not in parallel with final interviews.
They also seem to use a messaging system that sends you an email but that they can't get replies back from - after not knowing they weren't receiving my messages I followed up via other channels and they ghosted me. After a lot of positive feedback.
The role was also offering below market and used a healthcare reimbursement scheme.