Is it legal for me to be a security boss in the property and sign an hourly contract?

If the working hours exceed 4 hours a day and the hourly contract is illegal, you can go to the labor bureau for arbitration.

Hourly workers are part-time. Part-time employment refers to a form of employment in which employees are paid by the hour, and the average daily working hours of workers in the same employer generally do not exceed 4 hours, and the cumulative working hours per week do not exceed 24 hours. Either party of part-time employment may notify the other party to terminate the employment at any time.

If it is a normal full-time security guard, a formal labor contract needs to be signed.