The phrase "a former contractor" is correct and usable in written English.
You can use it to refer to someone who previously worked as a contractor but is no longer in that role.
Example: "After years of experience, she decided to pursue a full-time position instead of remaining a former contractor."
Alternatives: "an ex-contractor" or "a past contractor."
Mr. Snowden is a former contractor for the N.S.A.
As a former contractor, she knew how to get construction work done.
A former contractor, he has built a commercial real estate business in Nassau County.
But Mr. Hurd's time at the top came crashing down after H.P.'s board began investigating sexual harassment claims presented by Jodie Fisher, a former contractor.
Mr. Apotheker replaced Mark V. Hurd, who was forced out last August after an inquiry by H.P.'s board into accusations, never substantiated, that he sexually harassed a former contractor.
As a former contractor of an American spy agency who has been divulging its excesses, he is a "good American" who makes some of his compatriots look like "ugly Americans".
A leak by an anonymous former contractor led Gizmodo to report Facebook was suppressing conservative news in its Trending section.
The fountainhead of this stream of revelations, a young former contractor named Edward Snowden, declared himself to be motivated by a "reasonable fear of omniscient State powers kept in check by nothing more than policy documents".
The greatest strides, however, have been made by a little-known former contractor called Harmony.The secret, according to Bernard Swanepoel, Harmony's chief executive, is to stop trying to influence the gold price and concentrate on operations.
A furniture maker and former contractor, Mr. Gorham had tried for years to persuade his wife, a successful lawyer and graduate of the International Culinary Center, to start a business with him.
Ken Hassett worked for me on a time-and-materials basis, charging $30 an hour, and unlike my former contractor, he never put his agenda ahead of mine.
