What is the best way to implement a web application?

Question

PHP

There is a large service on codeigniter, there is an api that is used for ios and android applications. There was a need to implement a separate interface for mobile devices on the site.
Tell me what is better to do, there is also a desire to have some kind of opportunity to work on SEO.
To do it separately again on codeigniter and any other php frameworks, I think, there is no point. While the thoughts are angular and work on api, but then, as I understand it, SEO is out of the question.
Anyway, share your experience.

Answer 1

in general, I decided to just make two blizzards, while it works fine and there were no problems.