TheFanOfPixels Thank for your reply. This really helps, and also, I agree on you about courses. If you can't use the information after you learned, where is the benefit of it, right? That's why I opened this topic.
About your question, I meant by "Business English" that the communication methods and practices about daily business life such as "meeting on the phone", "remote working", "chairing a meeting" etc.
Anyway, I found a program which name is SudoSpeak. They say that they are offering a tailored curriculum for improving Communication Skills to software developers. Totally online and one-on-one program with native English speakers.
I would be happy if you share your thoughts about it before I enroll it 🙂
Any comments would be helpful 🙂