Wa `alaykum As-Salamu wa Rahmatullahi wa Barakatuh
In the Name of Allah, the All-Merciful, the Mercy-Giving
All praise is due to Allah. Peace and blessings be upon His Messenger Muhammad.
You are allowed to work as IT manager in the company. Your work is not affected by the fact that some of the products made by the company could be misused or abused in a manner that is not lawful in the Shari`ah.
One of the rules of Fiqh is that we are not questioned about things hidden or out of sight over which we have no control. If we were to declare things as forbidden, then no one could sell any products for most of them are liable to misuse.
A clear example is a seller of grapes or knives, beds, carpets, mics, computers, etc., as someone may buy them to make wine or hurt or kill someone, or purposes that are explicitly forbidden by Allah. And yet the seller is not responsible for such actions, even though he may have sold them to him or her.
Since the seller is not responsible for such actions, he does not need to inquire into who buys them and for what purpose.
Having said this, I would also like to add: If you still have doubts about the taints of haram associated with your work, you may cleanse and redeem yourself through optional charities and lots of Istighfaar. Allah says, “Verily, good deeds help expiate bad deeds.”(Qur’an: 11: 114).
Almighty Allah knows best.
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