I am currently a sophomore year student in Computer Science at the university and i want to start writing my CV.
I want to mention in the introduction to my CV that I was once a QA at several Hi-Tech companies and I am debating how to write it in proper English.
"Prior to study at the academy I worked as a QA at several Hi-Tech companies from 2015-2018"
or
"Prior to my study at the academy I worked as a QA at several Hi-Tech companies from 2015-2018"
or
"Prior to studying at the academy I worked as a QA at several Hi-Tech companies from 2015-2018"