HubSpot Senior Software Engineer interview questions

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Recruiter reached out and gave me the REST API Assessment question which is the same given to everyone. Finished that in 3 hours. Getting the data and processing it and then sending it back. Then scheduled on-site interview. 1st Coding interview - Easiest question ever asked for a Senior Software Engineer interview, 2 sorted arrays, merge them in a sorted way and return back the result with a limit number of elements. i = [1, 3, 5] j = [2, 6, 8, 9] k = 4 return = [1,2,3,5] Solved it in like 15 mins, and then he asked me make it work for all corner cases to which I wrote all corner cases except for 1, the last one for which I had to look up a syntax on google (FYI they clearly stated that you could google for syntax and stuff if you need help). Then he smirked at me and said "huh you don't even know this?" And then he asked if I have solved this question before? Implying that I dont really understand the algorithm and I memorized the solution lol. I was like in my mind - "bruh do you understand that even a 1st year undergrad could solve this question?". It is like a basic question to start with for someone who is preparing for interviews. It was demotivating and rude. Based on the feedback this is exactly why I got rejected. I feel like this is the stupidest reason to reject someone. Asking for a corner case and then rejecting if you forgot a syntax and on top of that insulting and insinuating that you memorized the solution. I mean what the hell. 2nd Database System - Design a simple social network backend. So basically design a tables for that and query to get news feed of all your friends and your posts. They dont care about likes and stuff. Just created a relational database tables and optimize it and get the information faster. Don't worry about creating too many tables and stuff. Just do basic and thats what they expecting but they will dive deeper into it. Did okay on this based on the feedback. 3rd System Design - URL shortening service. Did really good on this. 4th Behavioral Round with HM. Pretty straight forward like any other behavioral round. Did good on this as well. Recruiter was awesome! She was helpful, prompt in getting back and very responsive. She was amazing and quickly gave me a feedback as soon as possible. 10/10 for her responses and getting back on time.