It is a server that you have put on your CV that was freelance for a few years. This word is composed of free and hauling, which translated means free throws, respectively. Therefore, it sounds like there is a historical explanation behind the term. And researching a little I found the solution.
Nowadays this term is used to talk of people working on their own, offering their services in a more or less work in short time. It is a very common way of working in journalism, graphic design or in the world of scheduling applications, to name a few areas. But as I said, this is now.
Sir Walter Scott, the creator of Ivanhoe (1819), speaks in this work of mercenary warriors known as freelancers. Therefore, this type of medieval warriors, mercenaries in the end, comes the word. The other hand, it is entirely logical if we divide the word and we are “free lance.” They were soldiers who were released to their service than that paid, and therefore were free to choose the side of the fight or who were serving. And as the current freelance, after the service, otherwise. I suppose in some cases would face the gentlemen who had fought earlier.