50onRed interview questions

I interviewed with parent company Red Spark. Reason why it's negative: After the in-person interview a month passed and I never heard back from anyone from the company, even after making a few inquires. In my opinion the least you can do after a candidate spends 3-5 hours in your interview process is let them know they didn't make the cut. Starts with a call with their in-house recruiter, basic stuff. Then you do a phone screen with two engineers. They will ask you to be at a computer and complete a couple coding problems that amount to things like returning the index of a specific item in an array. The in-person is a ramped up version of this where they ask you to complete some challenges on the whiteboard. White-boarding isn't my favorite thing in the world and at the time I had never encountered it in an interview process. Most companies seem to lean towards pair-programming sessions or a take-home challenges that you review in-person. The engineers I met were very nice and encouraging. They seem like they would be excellent colleagues and they're the type of people you'd want to work with. Again, the only reason for the negative review is the lack of communication afterwards. I actually don't know what my fate was as they never told me. Some Questions: Reverse an array, then followed up with how I could make it perform better. Return the index of an of an item in an array (without using indexOf obviously). There was also a challenge on prefix notation which I had never heard of until that day. They didn't ask about time complexity (Big O) or anything like that, but I imagine you'd get brownie points for knowing it.