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You can make a per job arrangement with an employee, so long as you comply with applicable labor standards, such as minimum wage and overtime. So if you pay the employee $20 per floor, and he takes 3 hours to complete the floors (on average), then you would be paying less than $7.25 per hour, which would be illegal.
The same thing goes for overtime. If the employee works over 40 hours per week, you would have to pay at least 1.5x the minimum wage for hours worked over 40.
As long as you comply with wage and hour requirements, you can make a "per job" arrangement.