働いてるの

are you working?

→ 働く
phrase Common #5,597
are you working? A casual spoken form of 働いているの. The subject is understood from context, and の softens or adds an explanatory tone to the question.
JA: 明日は働いてるの?
EN: Are you working tomorrow?

トムとメアリーは一緒に働いてるの?

Do Tom and Mary work together?

どうして私、一生懸命働いてるの?

Why am I working so hard?

どこで働いてるの?

Where do you work?

— ロシアン・ブラザー (1997)

へえもう働いてるの

Oh, you’re already working?

— 魔女の宅急便 (1989)

今夜は働いてるの?

Are you working tonight?

いつ働いてるの?

When do you work?

今日は働いてるの?

Are you working today?