YOU SAID:

I have worked 3 years for "Google Express".

INTO JAPANESE

私は「Google Express」で 3 年間働いてきました。

BACK INTO ENGLISH

I've worked at "Google Express" for three years.

INTO JAPANESE

私は「Google Express」で 3 年間働いてきました。

BACK INTO ENGLISH

I've worked at "Google Express" for three years.