"I'm worried about scale as if this thing is going to take off it needs to scale big..." Please don't say this. If you are being paid by someone else, please

"I'm worried about scale as if this thing is going to take off it needs to scale big..." Please don't say this. If you are being paid by someone else, please check with them to ensure what their priorities are when things "scale big" bc often times you can bide yourself time if you have their requirements met while you scramble to make everything perfect on the backend. If you are not being paid by someone else or this is a side project, then please do not try and solve this question now. Answers to questions of "scale" are so broad that you will drive yourself mad trying to find the "perfect" tool, when one doesn't exist. You don't scale a language or a framework, you scale application logic. Scaling to millions of requests is the best possible problem to have, but put yourself in a position to have that problem! And asking basic questions of how to build something that can handle some amount of load in a language that you are not familiar with will FAR outweigh the perceived benefits of choosing that language/framework!