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.
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question
phrases phrase-requests
How do you say "I worked for [X company]."?
`〜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](https://japanese.stackexchange.com/q/6157/78).
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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.
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