Lumos Labs interview questions

Very easy to understand, the atmosphere was relaxing and encouraging. The interviewer was pleasant, it didn't seem like an interview, more or less having a pleasant conversation with your fellow colleagues.

4 interviews 1st - VP of Engineering, very light and friendly interview, nothing technical at all 2nd - Lead Designer and an Engineer, lightly technical but no challenges of any kind 3rd - Sr. Engineer and an Engineer, very lightly technical, asked about binary sort trees, nothing relevant to practical engineering. 4th - Principal Engineer, this was cancelled "due to a conflict" and was never re-scheduled. I was then ghosted for 3 weeks before inquiring to find out I was not selected.