similar to testers and inspectors, for example, they are hired by property management companies to enter the community to check the security duty and ground hygiene, and they are hired by restaurants to order food as customers, make things difficult for restaurants, and test the response of waiters. Because it is a part-time employee hired temporarily, the concealment is better, but it also lacks professional vision, so the design requirements for the assessment test form are higher. Generally, large chain enterprises will have similar employment plans.

This kind of position does exist. As to whether it is reliable or not, it mainly depends on the contract you are exposed to. It is very important to read the terms carefully.