한국 메이저 증권 금융개발자입니다. 미국 석사 후 취업시 경력을 인정 받을 수 있을지?

To give you a very simple answer. “yes, it is possible.” However… as you probably know already….. it is case by case.
If you are asking if there are any cases? then YES.
Most of time? No, they don’t care about your exp in Korea.