YOU SAID:
Ella mate I am a senpai
INTO JAPANESE
エラメイト私は先輩です
BACK INTO ENGLISH
Elamate I am a senior
INTO JAPANESE
私は上級者です
BACK INTO ENGLISH
I am an advanced expert
INTO JAPANESE
私は高度な専門家です
BACK INTO ENGLISH
I am an advanced expert
You've done this before, haven't you.