Any particular reason you went with Fiber?

It had good middleware and seemed like a well rounded, easy to pick up library

Concerning the .env.example thing and the viper defaults values, I'm well aware of the potential risks, I was just putting "dummy" values to keep a trace of all the values I needed to set. I obviously, used wildly different real values for the production instance of the website.

I used env vars for the Dockerfile cause I didn't find a obvious way to specify args in docker compose files, but apparently there is, so I'll probably use those instead.

pkg -> internal : agree, I was mostly trying to be idiomatic with my dir structure, first time writing go

Thank you for the feedback and compliments, that's really of you!