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The context is you're casually telling a person where you've worked in the past.
I was thinking something like: IBMで働いた or IBMで仕事した.
But it didn't seem right. In English, the conversation would go something like:
A: Where did you used to work?
B: I've worked for IBM. And also, I've worked at Best Buy.
〜で働いた is fine for literally "worked at". But I more often hear 〜に[勤]{つと}める meaning "employed for/by 〜"; usually in the 〜ている form ("am currently employed for/by 〜"). In this case, I think you'd just use the simple past tense.
IBMに勤めたことがある。そして、BestBuyにも。
Also, see this post about a unique employment situation: Employed by one institution but work for another.
〜で勤める, and it sounds incorrect to my ear, but that's not to say it is.
In casual conversation I think you can say:
A: (前は)どこ(orどこの会社)にいたの？/いたんですか。
B: ((ずっと)前(は))IBMにいた/いました。あと、BestBuyにもいた/いました/いたことがあります。etc.
... using the verb いる(居る), or
A: (前は)どこに(orどこの会社に/どこに仕事(に)/仕事(は)どこ(に))行ってたの？/行ってたんですか。
B: ((ずっと)前(は))IBMに行ってた/行ってました。あと、BestBuyにも行ってた/行ってました/行ってたことがあります。etc.
... using the verb 行く.
Of course you can say:
A: どこに勤めてたの？/勤めてたんですか。
B: IBMに勤めてた/勤めてました/勤めてたことがあります。etc.A: どこで働いてたの？/働いてたんですか。
B: IBMで働いてた/働いてました/働いてたことがあります。etc.
... using 勤める/働く. I think using いる/行く would be more colloquial.