When operating as a freelancer, workers will not be taken on as a full member of staff. Instead, they will operate on an individual contract. Contrary to belief freelance contracts can still be long and may last years. 

However, most will not stretch beyond a couple of months. One of the greatest benefits of a freelancer is that businesses can access the top talent without any of the typical commitments such as benefits. When you need an engineer on a tight budget, here’s your solution.
For more info: 
hire a freelancer

Or visit this link or this one