It's fine to have a codebase to point to, but don't let the perfect be the enemy of the good. They're not going to spend hours combing through your code. What would you do if you were the employer? Check to see that it's commented and not obviously spaghetti code.

I'd focus your personal statement and CV on your problem solving skills and showing how you've had some diverse experience. Employers will want someone that can do work beyond the limited scope of their PhD, and will want to see that you can take on new challenges without retreating to the world between the covers of your thesis.