In Engpsh, a temporary worker is often referred to as a "temporary employee" or a "temp." You could also say "contract worker" or "freelancer."

For example, you could say: "I'm just a temp at this company," or "I'm working as a contract worker for a few months."

Note that the terms "temporary employee" and "temp" generally refer to a worker who is hired by a company on a short-term basis to fill in for a permanent employee who is absent or to handle a temporary increase in workload. "Contract worker" and "freelancer" can refer to a worker who is self-employed or who works on a project-by-project basis for multiple cpents, rather than being a full-time employee of a single company.