This guy is so good at problem solving, he solved the entire coding interview problem and honestly, if you could build something like that, a company should just hire you straight up without any questions.
I personally hate some of these coding interviews because if I built a SAAS that's makes 2mil annual revenue and I apply to work for a FAANG company. I will probably be asked if I can reverse a linked list or sort a list and if I am not able to, it means that I am not good enough.
What I am saying is that, the experience of me building a product being used by many people is ignored and until I prove that I can sort a list or reverse a linked list, I am not good enough which I personally think is bad.
I would never endorse cheating in an interview.... but these companies all missed an opportunity to hire someone who seems absolutely brilliant. Would I want to hire someone who just cheated on my interviews in a boring old school way? No. Would I want to hire someone who built an AI tool that allowed them to flawlessly cheat in my interviews and circumvent the anti-cheating measures we thought we had? Absolutely.
Before my first interview, I solved around 1000 problems on LeetCode. After five years of working as a developer, I never — never — had to use that knowledge. So now, I barely remember any of that stuff.