[adam-_-]

Why would you have a co-founder onboard whom you didn't trust with your codebase?

It sounds like you either don't want a co-founder and just need a front-end contractor or you need embrace him/her as a co-founder and share your codebase.

[dudeofjude]

Running it alone is pain, I can do things on my own, but that model does not scale. It takes too long. Besides I can't be expert at everything. So I need to add people with complementary skillsets.

I make sure people gel well with me, but you can't give everything you got to a new comer, no matter how genuine he appears, right?

[Spoom]

You haven't got a co-founder then, you've got an employee.

[Eifrig]

I agree and would add front end guys and source code don't mix well anyway! Or is your front end guy called Bill?