[jungler]

Bias heavily towards ease of debug and deployment. When you're the one-man-band you need to leverage all the tooling towards realizing the design, and avoid the scaling rabbit hole. That means - simple now, rewritable later as you bring in hires.

You will need a solution for producing front end JS/HTML/CSS. This should probably be your starting point in fact - create a site mockup with static pages and no real backend, use that to gain feedback, then build out the real functionality. For JS code Typescript is a very popular option to aid some additional maintainability. There are also many build systems available for compiling finished pages.

When you're ready to have a backend, you can evaluate it separately later. You need a combination of a language, a web server, and a database at minimum. Again, an early site can avoid horizontal scaling and focus on having one good database doing everything and backing everything up reliably. (Focus backend efforts on reliability first!)