Weekend Web Developer

I need a Web Developer for helping me with a few projects on weekends, starting Saturday the 2nd of December (16-20 hours each weekend). Javascript is the main language (Meteor, NodeJS)
This position will be initially for 2 months but it is likely to ---------- voice is needed, therefore I can pay if you are able to emit invoices or we can use websites like PeoplePerHour or Code Mentor.
Pay attention that I'm in the UK, therefore we have to match our time (7 hours of difference).