Should a junior/middle/senior front-end dev know the basics of php and/or ajax?

Question

Frontend

- Should a junior/middle/senior front-end dev know the basics of php and/or ajax?
- should he do sending data from the form and the like? Or is it already considered backing?
- what are the main tasks that a frontender should perform?

Answer 1

In the status of a senior, you know what is around, on occasion you can make something in a short time or it is better to delegate it to your neighbors. So expand your horizons at least to the knowledge of a junior.