You should take a look at Toptal, I use it for just this, working around 20 extra hours a week. Can't give out my rate there, but it's fair. Easy to get gigs o

You should take a look at Toptal, I use it for just this, working around 20 extra hours a week. Can't give out my rate there, but it's fair. Easy to get gigs once your in, the clients I've worked with have been good. Very little mental overhead since they handle invoicing, getting customers etc.