The approach I have seen applied to many larger scale functional programs is Domain Driven Design (DDD). DDD was formulated - and the book written - with Object Oriented methodologies in mind, but it has been re-imagined using functional principles.

There is a book on the subject, Search. It is written specifically using F#, but the general principles apply.

I am a big fan of Dave’s approach in his course:

That’s assuming you have learnt Elixir - if you haven’t I’ve currently read Programming Elixir and Elixir in Action - and I highly recommend both

If you already know some elixir then I can recommand this book as well! Search

It more of a tutorial focused mainly on the backend part (there is some front end work as well). Great read!