I am not an expert on the federal public service in Quebec, but from what I've heard, English is the language of work used most often, which ought not to be the case in Quebec. For many francophones, the freedom to choose their language of work in the federal public service in Quebec is an illusion.
The federal public service is also subject to unequal or competitive bilingualism. For me, this is a very serious problem for the vitality of French in Quebec. The federal government is therefore actively contributing to diminishing the vitality of French in Quebec.