hellogoodbye777

It sounds like you're threatening your interviewers' egos.

If the value prop is that you're Heroku, but faster, I can understand that.

I think it's misleading to say that deficiencies of Heroku have anything do to with AWS though. It's really, really easy to set up anycast [https://aws.amazon.com/global-accelerator/] with ECS [especially if you're willing to pay for Fargate]. If your product does something meaningfully different than that, I'd love to know more.

NB: I'm in no way affiliated with AWS or Heroku, just have experience with both in the past.

Why would I care? I have <30 ms ping to AWS. Maybe there's an argument for this for something like realtime-ish like games, but this feel likes a massive premature optimization for anything solving typical business problems.

That's not meant to be a snarky question, I genuinely don't understand what business problem that's going to be solved by saving at most 30 ms. Anything written in Rails/Django, talking to a DB, etc. is going to have request latency dominated by other parts of the stack.