How to flirt with a coworker under the radar?

It's just a college job at a local deli, and I can easily quit since I have a job promised. I want to flirt with a coworker, so she knows I'm into her. How do I do it under the radar?
Updates
+1 y
By under the radar I mean no awkward displays for all to see.
How to flirt with a coworker under the radar?
Post Opinion