Coding Assessment - why is Leetcode the norm for coding problems when most companies use Hackerrank ?

Definitely practice in online coding environments like HackerRank and CodeSignal and CoderPad before doing online assessments! It's something that trips people up for no reason! You can do practice tests/projects on all the platforms. Facebook/Google/Amazon have their own environments you are sometimes coding in, but they'll prep you for that. Most assessments are coding problems, but the platforms support much more complex questions, from multiple choice, to text-based, to system design, to practical problems.

Also go the CodeSignal GCA! If you can't do it DM me! We run tends of thousands of tests through CodeSignal and can fire one off for you.