You can say them but they don't mean the same as I'm not working there anymore. In the two alternaltives you give you have never worked there but the listener expects that you may be/will do. You could say, "I no longer work there" however, "I don't work there anymore," is the most natural.
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AnonymousCan I say "I'm still not working there / I still don't work there" as an alternate for I'm not working there anymore?I don't recommend that. still with a negative is possible, but not usual. still usually goes with the affirmative and anymore with the negative. They're like opposites. still means that something alread