Occasionally I come across a good programmer that I could use to do some projects for me. I have lots of ideas and need help sometimes. I wondered if it's allowed to hire someone?
You should go with the Stack Overflow Careers-specific site to hire people:
It is not a good idea to try to hire people within the questions and answers site by leaving comments. That's not what the comments are meant for. Though, if you find the person's email on the profile, well then you can contact them. The profile is public, so if someone leaves their email, it's okay to communicate with them.