Recommendations for High-Volume Interview Scheduling Software?

I’m on the lookout for interview booking software that can handle high volumes. I’ve tried Zoom Scheduler, MS Bookings, Calendly, HubSpot (which we use as our CRM and makeshift ATS), among others, but I haven’t found the perfect fit yet. I’d appreciate any recommendations based on your experiences, including the pros and cons, as I’m looking to streamline our scheduling process.

A Bit of Context:

  • We conduct between 700 to 950 interviews annually, averaging 10 to 60 interviews per week over a span of 38 weeks.
  • Our interviews aren’t scheduled on a fixed rota, and our interview panels (consisting of two members) vary from day to day and hour to hour. Staff members are brought in based on their subject expertise pertinent to specific candidates, making our HR support also variable throughout the day (our small team wears multiple hats).

Last year, I manually scheduled 750 interviews, and I’d really like to reclaim that time this year. Ideally, I’m looking for a solution that lets me send out a booking page with specific time slots available on chosen days. I’d also like the flexibility to either assign panel members by day/time or add them to the booking post-confirmation (the latter is less desirable). From what I’ve seen, most tools require either a consistent team setup or a rota for random distribution of bookings.

Is there a tool, whether one of the ones I’ve mentioned or another option, that allows candidates to book their own time slots while giving me the flexibility to adjust the interview panel as needed? Any advice would be greatly appreciated!