I'd use Postgres for the data layer, I'd build the service layer around OpenFAAS (using faasd) and Node/Typescript functions, and for the client I'd probably go

I'd use Postgres for the data layer, I'd build the service layer around OpenFAAS (using faasd) and Node/Typescript functions, and for the client I'd probably go with React/Next (though Svelte is starting to look pretty attractive). For basic CRUD functions I would probably use Postgrest. I'd stand it up on a VPS initially, using ansible scripts to make switching deployment targets to AWS easy.