As far as I know it doesn't affect. It's all BS "halla" in the internet that they would ask why did you leave the job in short period. I personally know someone who left the job immediately getting GC and got citizenship with no issue. There is no law that says you have to be loyal to your sponsoring company. It's free country and you can work for any company you like. In my case, they even didn't ask job history and I changed more than 5 companies during 5 years. Even if they asked I was ready to answer and that is "Better opportunity & good pay" . So enjoy. Don't worry and take that job.