Addepar Software Engineer interview questions

Contacted via third party recruiter, phone screen set up in a week. The interviewer arrived 12 minutes late and said his previous meeting ran long. Few tips for addepar interviewers: 1. 12 minutes late is not acceptable, you are wasting time of the candidates 2. What kind of message are you sending to outsiders about the processes in the company if you turn up so late for an interview? 3. Interviews take precedence over anything else (meetings, your manager stopping you for a quick decision etc). Candidates prepare, come in and anxiously wait for the interview to begin. 2/3 minutes is acceptable, almost 15 minutes is not I was pretty pissed, but I held my calm and continued the interview. Interviewer was nice otherwise. Question was a hard one, I thought I had 80% complete, but it was not perfect. I can understand why they passed on me.