noun
side job; side gig
A secondary job done in addition to one's main occupation, often for extra income. Common in modern Japanese, especially in freelance and gig economy contexts.
彼は本業のほかにサイドジョブとしてウェブデザインをしている。
In addition to his main job, he does web design as a side job.
サイドジョブで月に5万円くらい稼いでいる。
I earn about 50,000 yen a month from my side job.
Loanword from English 'side job'.