Is it possible to use the Google Maps API for a backend application or focus on dense PostGIS processing?

Question

PostgreSQL

Good day!
My problem is the following... There are a number of polygons on the map that need to be divided into a grid of ~1 ha squares, then double-check these squares to see if they are included in the given polygon, find the centers of the ones you need and write their coordinates to a JSON file.
I saw a similar thing in an example using the Google Maps API v3, however, everything was visualized and done in front-end JS. I don’t need to visualize (so far), but simply collect this data for further processing. That is, everything will be performed exclusively on the server side, and I use PHP. Can I use the same approach but for server side processing?
If the answer to the previous question is negative,But is it worth it then specifically with PostGIS or are there other options?