Okay....
I have a pretty advanced project that needs to be completed. It basically requires creating five pages of code -- using specific files as examples and modifying them.
It is urgent work and needs to be completed by Saturday. I estimate about 15 hours of work. You will be working with me on this and be in constant communication.
As you will be working with a confidential project -- not yet fully launched, I will require you to sign an NDA.