contract worker / part-time worker / casual worker / a person who does other paid work than a full-time permanent job / temporary worker
あるばいと
arubaito
アルバイト JN1
part-time worker / working [student] / [student] worker
あるばいとする
arubaitosuru
アルバイトする JN1;JVE
have a job on the side / work at a part-time job / have a part-time job / working part time / having a part-time job / work part time / working at a part-time job