Air carrier Captain reported a gate at FAT for Airbus aircraft does not have adequate separation between the jetway and the aircraft; and leads to near-collisions during docking and undocking procedures. The reporter stated that the aircraft's running engine was dangerously close to the jetway; where an operator was inside.

Narrative

Upon arrival at FAT station; we encountered issues with gate assignment communication. The usual channels of communication failed and no one at the FAT station responded to our radio calls. Eventually; we were directed to park at Gate XX; which was not listed on our page.Gate XX is a low-lying jetway primarily designed for regional jets. As we approached; all necessary ground personnel; including wing walkers and guide personnel; were in position; and all equipment; including the jetway; was placed outside the red safety lines. Despite this; our approach to the stop point seemed unusually long. Proceeding with caution; I advanced slowly; mindful of the jetway on our left. However; the guidance provided by ground personnel appeared confident and consistent.After stopping and shutting down the engines; I looked back and noticed that the jetway appeared alarmingly close to the wing and left engine. Upon opening the cockpit window; I was shocked to discover just how close the engine was to the jetway - approximately one to two feet. Initially; I suspected that the ramp team had stopped us at an incorrect point for an Airbus. However; upon review; it was confirmed that we had stopped precisely on the marked Airbus" stop point.The outcome was concerning; we had a running engine dangerously close to the jetway; with an Operator still inside.I raised the issue with the Ramp Supervisor; who called over the on-duty airport authority representative. During our discussion; it became evident that the airport authority had mandated the use of this particular gate for regulatory reasons; despite known constraints. The Ramp Supervisor had previously raised this issue; but the airport authority has not adjusted their gate assignment plans.Further investigation revealed that the stop point was marked for Aircraft Y - it's just marked "Airbus." However; the airport authority had not accounted for Aircraft X's differing footprint. This oversight positioned Aircraft X's engines unacceptably close to the jetway; breaching the red safety zone.Additionally; the jetway operator reported significant challenges with this parking position. They noted that the jetway's limited range of motion at Gate XX often results in near-collisions with the aircraft during docking and undocking procedures."