Checking out some examples of the phrases "in the backend" and "about the backend" on Google Publications, it seems that everything that runs from the backend (processes, services, and so on. In several scenarios, absolutely the direction for every of your prepositions might be effortlessly inferred within the context, e.g. https://judahpnhbt.blogzag.com/79888076/5-tips-about-frontend-development-company-you-can-use-today