I have never taken the JLPT. No Japanese person or company has asked me about the JLPT, either. I don’t think it has been a consideration in any of the interviews I’ve conducted, both my successful and failed ones.
As pwim notes above, they definitely care about how much Japanese you can communicate, both written and spoken.
If you want to take the JLPT, do it for you own reasons, but don’t do it to help you get a job. In my opinion, the best use of time would be to get help writing a really good 履歴書, practice 面接 with a teacher, and visit sites like qiita.com to really sink your teeth into communicating technical subjects in Japanese.
They’ll know in 5 minutes of conversation with you where you stand, a test (or there lack of) won’t help or hurt you compared to that.