I do front and backend work. Biggest issue I see is people not thinking through interfaces properly (e.g. efficiencies & atomicity of operations), sanitizing inputs on both sides, error handling, and putting in the appropriate validation, authorization & testing.

As a full stack dev I'd like to say that the issue I see most from backend devs isn't a lack of styling, it's their need to wrap every element in 15 motherfucking divs. They don't seem to understand that most html elements are self contained and can stand on their own.

Akshwallyyyy those are both presentation problems, eg frontend

Edit: to those downvoting me please tell me why a frontend dev would end up showing a raw error like that on a page

Front hand back hand?