URL-First Design.

URLs should be designed in the early stages of website development as users must be able to read, guess and edit them, and it helps designers to define site structure.

Designing Content-First for a Better UXGather Content
15 SEO Best Practices for Structuring URLsMozFebruary 24th, 2015
Responsive Design Begins With The URLSmashing MagazineMay 2nd, 2014
URL as UINielsen Norman GroupMarch 21st, 1999