FlexTrade Systems Inc. interview questions

Associate technical analyst, job name is inappropriate, more like a communicative customer support role that must work long hours but occasionally need to modify some scripts and setup some scripts, modifying files or whatnot all in a linux shell and minor gRPC updates. The job itself, performance is graded based on customer satisfaction, response times, etc which you need to be working a minimum 9 hours each day due to the NYSE trading hours and weekends as the markets are open too. Started off as a screening interview where you walk through your experience and ask you about direct customer interaction experiences. Afterwards I was given a hackerrank to solve like 10 multiple choice questions and 1 coding question within 1 hour time. I got shortlisted and moved on to the HR-like interview where originally was supposed to be 1 hour long but interviewer ended it in 30 mins... Interviewer came in 2 minutes late, said he had technical difficulties with his camera but was just an excuse to not turn it on as he was doing other things during the interview, and clearly once he realized I had more of an engineering background than a customer support background it seemed like he quickly wrapped up call 30 mins early. Be prepared to get asked simple quick linux filters like "what is telnet", etc as if you can't answer those and they will reject you pretty quickly. If I had moved to the next round, it would've been an on-site technical interview where I would be tested on linux commands and gRPC knowledge and a vibe check with the senior folks there.