With tools like ogen[1], one can take a single OpenAPI document and generate server code with a static router, request/response validation, Prometheus metrics, OpenTelemetry tracing, and more out of the box.
It can also generate clients and webhooks. Authentication is just declaring a SecurityScheme in the OpenAPI document then implementing a single function. The rest of the backend is just implementing a single interface. Unlike oapi-codegen, there is no need to tinker with routing libraries or middleware for authentication and logging.
Pair this with sqlc[2] and SQLite's `pragma user_version`, and you get type-safe database code and database migrations for free. I will concede that adding SQLite is a manual process, but its just two imports added to main.go.
Frontend is entirely your choice. Go's standard library provides good enough text templating that I don't miss ERB or Django-style templates. Using the standard library's `embed` package, one can easily embed static assets into a single binary, so deployment can be as simple as `go build` and moving the binary.
I have a hard time using languages besides Go for developing backends, because the code generation tools make Go as convenient as frameworks like Quarkus while staying lightweight and fast.
[1] https://ogen.dev/
[2] https://sqlc.dev/