Answer: contingent
Explanation: It refers to the employment in which the job of an individual is not fixed with the company. In case of contingent employment, the employees are usually hired when there is a specific project to complete that needs extra work force.
Unlike seasonal employment the these employments are non recurring and there is no time fixed for employment that an individual could expect.
Thus, from the above we can conclude that the given case is an example of contingent employment.