I've been in similar situations to yours. I left immediately both times and don't regret it. The truth is in this field most employers don't care about resume gaps as long as you have a halfway decent explanation. You can even say you just wanted to take an extended vacation.
No, it's not unprofessional. Would they be unprofessional by firing you on the spot? That's essentially the answer to your question. Businesses don't have feelings, and you're not going to hurt them by handing in your resignation. Better businesses won't hold it against you that previous employment opportunities didn't work out.
Also, life's too short to work at some software chop shop. Contrary to what some here are saying, there are enough decent dev jobs out there that it's just not worth dealing with the weight an employer hasn't been carrying. If they aren't carrying their weight and you're feeling crushed under it, you're feeling that way for a reason.
No, it's not unprofessional. Would they be unprofessional by firing you on the spot? That's essentially the answer to your question. Businesses don't have feelings, and you're not going to hurt them by handing in your resignation. Better businesses won't hold it against you that previous employment opportunities didn't work out.
Also, life's too short to work at some software chop shop. Contrary to what some here are saying, there are enough decent dev jobs out there that it's just not worth dealing with the weight an employer hasn't been carrying. If they aren't carrying their weight and you're feeling crushed under it, you're feeling that way for a reason.