Lever is an awesome product, really excited for them. One feature that I'd love to see is something like calendly or x.ai that allows the candidate to schedule a time based on the interviewers calendar availability–going back and forth in emails to schedule a time for phone interviews can get very tedious.
HR software hadn't seen much innovation for years, it's refreshing to see newer entrants getting money and traction. We use Lever's API, it's a delight.
Lever is probably the most innovative ATS on the market currently; amazing platform and excited to see what they're going to do with this additional funding!