How I Became HackerRank 1 in Two Hours
Over the past several months about 4 out of 10 companies that interviewed me actually required me to complete several HackerRank challenges because I did not have a HackerRank score.  The fact that I have worked for several industry leading companies, and had 20+ years of development experience was irrelevant without that score.   As a sr. dev manager, I found this to be an odd requirement.