ANSWER:

If these ATMs are of conventional interest based Banks then it is absolutely not permissible to work in any of its departments. 

My question is it permissible to work for companies dealing with ATM machine support. Through a voice support.

Jobs, Riba | January 24, 2019 2:22 am
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You have explained that one is allowed to work in a company which takes loans from conventional banks. Can one work in the Accounts Department of such a company as the person is obliged to complete transactions regarding these delayings including financial reports?
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I am from Jammu & Kashmir. I hope you are aware of the situation here. I need to ask that, if is is ok to work for the government here?