How easy is it?

Backend programming might be more challanging than front-end development. As a backend programmer, you might find yourself in the position of
devising new ways to solve specific processing problems.
Such problems often involve mathematical calculations. If you are working on simple problems you might have enough capabilities, especially if you enjoy mathematics to some extent. However, if you need to calculate complex climate dependencies in the backend, you require far more than just experience in mathematics.

On the other side, there are always some libraries available that can help prevent getting lost in complex calculation problems. Additionally, complex parts might be actively outsourced to specialists to develop the necessary functions.