I think developers on call is unusual. You probably got what we used to call “pager duty” because you’re junior. I can’t imagine a company putting senior developers on call. Most companies hide their staff behind call centers and ticketing systems.

The good thing about dealing directly with customers is learning how the product you work on gets used. There’s often a big disconnect between how developers and managers imagine people user the product and what actually happens. Plenty to learn from that.