Do professionals working in the tech departments ever need to learn other languages than their mother tongue ?

I agree with experts answer. Thanks for the invitation

sure they need to keep learning for everyone

I am from Philippines but my mother tongue is "Bisaya". For its important to learn new languages of others in order for us to understand each others. And also it enables us to grow not just physically as well as socially because we can be able to understand people by communicating them in their language of what they want to express especially when we go to other country for instance I will work as OFW in other country, So first thing to do is to study the culture and language to that specific country in order for us to understand and communicate them.

Urdu is my mother tongue and till now there is no direct technology made or tech departments make it mandatory condition otherwise disqualify the candidate applied for job. So, technically in my case, to get myself job in tech department I had to learn new language as well. So I prepared, attended the tests and also passed IELTS exam. Alhamdulillah, I got tech job in that way. I am also learning and want to understand Arabic too

Not necessary but useful to them and important

Each language you learn open for you a new world, in all fields.

yes, because sometimes a teacher does not choose his students so he must communicat ethe language of fis students whatever their origins are .

Yes, I believe one language one life.when you learn a language you learn a life.You learn How other people are looking to the world. This is happening from other words and sentences and languages.

More languages - better, this is an age of globalization so more you know better 

It's better to learn other languages to some extent of course. 

to learn some other languages will be useful in any matter