で働いてるのよ

work at

→ で
phrase Rare #36,440
work at A casual form of で働いているのよ, meaning “work at/in” or “be working at/in.” The のよ adds an explanatory or emphatic tone and is traditionally associated with feminine speech, though it is not exclusively used by women.
JA: 私は病院で働いてるのよ。
EN: I work at a hospital.

メアリーパン屋さんで働いてるのよ

Mary works at a bakery.

東京で働いてるのよ

I work in Tokyo now.

彼ね日本のレストランで働いてるのよ

He works at a Japanese restaurant.