I was contacted within a week of applying, and then received an email with a link to a video interview. The video interview was very awkward, as you only have one chance to record yourself answering a few questions that you only have a couple minutes to prepare for after seeing for the first time (it's not a live interview with someone, just you recording your answers to some preselected questions). However, the questions were fair and in some ways the experience is less stressful than a live interview.

After the video questions, I was asked a few programming questions. These did not involve any video recording, of course; I was simply asked to write three programs that completed short tasks and produced specified input, given the ability to run the programs and check my answers. There was an emphasis on string manipulation. I had forty minutes to complete each program. No follow up interview but the process was very efficient and the senior recruiter I spoke to was kind and professional.

Define a race condition and two ways to prevent it.

Write a program that reads a string and prints how many times each letter appears in alphabetical order (omitting letters that don't appear). E.g., input "hello" will print "e1h1l2o1"