> I don't know nothing monolithic like Rails for Go, do you?

Revel is pretty monolithic: https://revel.github.io/

I've used it to build a web application, and here are some of the problems it addresses (this is just the table of contents from their manual):

    - Controllers
    - URL Routing
    - Request Parameters
    - Validation
    - Session & Flash
    - Results & Response
    - Templates
    - Interceptors
    - Filters
    - Websockets
    - Internationalization
    - Cache
    - Database
    - Debugging