Not a terrible experience overall, but every interaction with them came off as rather immature and amateurish. The CEO, reached out on AngelList with a note saying how much he loved my profile and what a great fit I'd be with the company. It became clear on responding to him that his message was just part of a blast message to many candidates. After responding to the CEO's message to indicate my mutual interest, I was contacted by their recruiters (and copied on several of their internal communications) to set up a technical phone screen with the head engineer. This interviewer was subsequently 20 minutes late to the technical phone screen. He never acknowledged being late, (let alone apologize) and jumped right into the coding challenge with virtually no pleasantries or intro into his role/background, etc. The coding challenge was interesting, as it was relevant to their business, and of average-to-easy difficulty. I completed 90% of the coding challenge, and would have completed 100% (all that was remaining was more of the same) had the interviewer not been 20 min late. A week later I received a "no thanks" email.