Huawei immigrated to Hong Kong.

I don't quite understand what you mean by "overseas operation and maintenance", but there are still some suggestions for reference.

1 Shouldn't Huawei have many overseas missions? You can consult the person in charge. ...

It is relatively easy to apply for a job in Singapore directly after graduation, as long as someone is willing to take you. Please Baidu for the specific operation process.

This also applies to Hong Kong.

Australia classifies computer major as immigration major. You can apply for skilled migration to Australia and then find a job locally.

It is very difficult to find an American company and apply for an H 1B work visa directly from overseas.

Besides, my English level is poor. At least, listening, speaking, reading and writing are basically accessible, because you have never been to school before, but you can adapt to it for a while, but you have gone to work. The boss won't go through the formalities for a foreigner, and then this person can't even speak fluently.