An employee at Aqueduct says a weekend heist was an inside job, telling The Post that the robbers knew exactly where to be to pull off their $250k racetrack robbery.

The money was stolen Saturday night while being transported — by unarmed guards — from an office on the third floor where the cash is counted to a vault in the basement, the employee, who preferred to remain anonymous, told The Post.

After leaving the counting room, the guards cross a catwalk, then walk to an elevator that leads to the vault, the employee said, and that’s exactly where the crooks made their move.

“It’s a joke! They waited for them upstairs on the catwalk. It happened on the catwalk! They knew when they were bringing down the money and [that the guards escorting the money] didn’t have no guns. The guards in the vault area and the office, they have guns. But the guard escorting the money ain’t got no gun,” the employee said.

“You tell me, how did they know exactly where they bring the money down? The exact route from upstairs to the vault downstairs? It had to be someone familiar with the procedure here,” he added.

The robbers entered and left through the Turf and Field entrance on the south side of the Aqueduct complex, which the employee says has no cameras.

A spokesman for the New York Racing Association, Pat McKenna, said there are cameras at that entrance.

After the swiping the money, the bandits took the elevator to the first floor and simply walked out undetected, the worker said.

The entrance opens right onto the south side parking lot, which faces the racetrack’s main entrance on Aqueduct Road.