Troubleshooter (noun)

A person who is employed to solve problems or deal with difficult or complicated situations.

Origin:

Mid 19th century: from trouble + shooter, on the pattern of problem-shooter.

Examples:

1. The troubleshooter was called in to resolve the technical issue.
2. The company's troubleshooter was known for his ability to find solutions to the most complex problems.
3. The network troubleshooter was able to restore the connection within a matter of minutes.
4. The troubleshooter was able to resolve the conflict between the two departments.
5. The software troubleshooter was able to fix the bugs in the system.