How well do you need to know English?

Question

Career in IT

Good afternoon. I have a question, how well a programmer needs to know English or what level to work and live freely in another country, for example American

Answer 1

To work and live freely in American country, it is enough to be a local deaf and mute.
Do not worry.

Answer 2

So much so that they take you for their own, the inhabitants of America can see through you that you are not your own, be careful

Answer 3

The higher the level, the better. With upper intermediate it is already possible to live more or less comfortably.

Answer 4

Like any other for life, it's good to read, speak, listen