Use what you know and like and just build the app. And for a large app, use what the team knows. Both dev and ops. Scaling is a nice problem to have, but don

Use what you know and like and just build the app. And for a large app, use what the team knows. Both dev and ops. Scaling is a nice problem to have, but don't solve it until you have it. And since scaling issues are mostly matters of architecture, rather than language, see rule one: "use what you know."