Fixer (noun)

1. A person who arranges things, typically illicitly or illegally, for other people.
2. A person who can solve problems or get things done.

Origin:

Early 20th century: from fix + -er.

Examples:

1. He was known as a fixer in the criminal underworld.
2. The politician had a reputation as a fixer who could get things done.
3. The fixer arranged for the release of the hostages.
4. The fixer was a go-between for the corrupt officials.
5. The fixer was able to get the permits needed to build the building.