The on-site technical question was focused around debugging an existing codebase in Flask - so not really data structures or algorithms related, and rather more about how you can adapt to a codebase in a framework you're not expected to have any experience in.
Anonimo
It's essential to demonstrate that you can really go deep... there are plenty of followup questions and (sometimes tangential) angles to explore. There's a lot of Software Engineer Intern experts who've worked at Etsy, who provide this sort of practice through mock interviews. There's a whole list of them curated on Prepfully. prepfully.com/practice-interviews