Interview prep for junior dev position

Paul_Van_Castelen

April 23 in Questions

I'm still pretty new to programming but I've gotten decent at writing code, working with algorithms, databases, all that foundational stuff. Got invited to interview at a serious company and I really want to nail it. From what I hear they drill candidates hard on theoretical knowledge, not just whether you can hack together a solution that works. I know for sure they're going to ask about quicksort and heapsort, what they are and how they differ from each other. I get the concepts when I'm looking at code or working through examples, but explaining it out loud in an interview setting is a whole different beast. Where can I read up on this in detail, or can someone break down the key differences I need to know?

Answers

Mike_KennedyMember

April 23

Legit companies don't just care if you can Google your way through problems, they want proof you understand what's happening under the hood. You can slap together working apps all day long but the second someone asks you to explain Big O notation or why one algorithm beats another in specific scenarios, that's where people crash and burn. The sorting algorithms question is their favorite because it shows whether you actually grasp the tradeoffs or just memorized some answers off Stack Overflow the night before.
Lonely_WolfMember

April 23

Man, tech interviews make even smart people feel like idiots sometimes. You're cruising through code at home, everything makes perfect sense, then you sit across from an interviewer and your brain just shuts down completely. Read up on the comparison quicksort vs heapsort here https://hasty.dev/blog/sorting/heap-vs-quick . The article walks through how each one works and where one's better than the other, plus the performance differences that interviewers care about. Gives you solid talking points so you can answer confidently instead of stumbling through vague explanations.