the.com/troubleshooter

means A person skilled at diagnosing and fixing problems, especially in machines, organizations, or technical systems.

from A straightforward compound of 'trouble' and 'shooter,' from American English around the late 19th century, when the word described someone sent out to literally shoot or fix problems on telegraph and telephone lines — linemen dispatched to find the break in the wire. The job was physical before it was metaphorical: you rode out, found the fault, and resolved it on the spot. The sense broadened through the 20th century to cover anyone called in to resolve difficulties in business, politics, or engineering, carrying over that original image of someone dispatched directly to the source of the malfunction.