Will I Owe Money I Transition to Employer Coverage?

I signed up for Obamacare after my unemployment ran out and my health insurance (cobra) was nearing its end. I then got a job and got health insurance.

Because I had Signed up for Obama care earlier will I have to worry about a penalty?

My housemate also signed up for Obama care and has used it. He can only get a part time job (less than 3 or 4 thousand a year). Because I now have a job, do I have to penalized on my taxes because of him?