I applied online. The process took 1 week. I interviewed at AKUNA CAPITAL (Chicago, IL) in Jan 2016
Interview
Applied online with a resume drop (no cover letter) and heard back in two days. Took an hour-long 12 question exam on hackerrank -- 9 coding and 3 logic. If you passed freshman CS you could pass this exam. Basic pointers, loops, searching, and baby algorithms. Waiting to hear back for subsequent rounds.
Focused mostly on the sort of questions which one might have already encountered during their algorithmic review process preparing for the interview. Initial screen was done on a secure testing site and included a variety of different questions about many topics.
I applied online. The process took 5 days. I interviewed at AKUNA CAPITAL in Sep 2018
Interview
I applied and got a Hackerrank challenge in 2-3 days. They gave me two weeks to do a single Python coding challenge. The challenge itself was a bit dense and took quite a bit to understand.