Founder of <a href="http:&#x2F;&#x2F;InterviewKickstart.com" rel="nofollow">http:&#x2F;&#x2F;InterviewKickstart.com</a> here.<p>I like leetcode and hackerrank too. Though we don&#x27;t use their problems, we do ask our candidates to get additional practice there. Some solutions are very good there, though they can be cryptic to understand.<p>The only issue with these competitive programming-like sites for interview-prep, is that they encourage final perfect code and execution speed. That&#x27;s often not the goal of an interview. The first goal of an interview is to express your thought process, in a limited time. So if you&#x27;re only doing leetcode, and are doing well there (e.g. you can solve medium to hard problems without much agony), then you should follow your practice with a few mock interviews with practicing engineers.