Let me give you a brief idea of the situation I am in.
I work in a Media Industry as a Software Developer. Our team has 3-4 people and one of the co-workers is very Noisy. He starts boasting everything, over promising delivery which is certainly not possible. Sometimes he makes stuff by himself and reports wrong progress to the supervisor.
He sometimes even promises things to be done in next week without having an idea of how much time will it take and without even having a discussion with the implementation team.
I am pretty new to the team and I really don't know how to deal with it. Any suggestions would be helpful.
Edit: Impact on me -
As I mentioned, I am pretty new to the team and because I don't understand business property yet, I do understand technical details and a rough idea of how much time it will take which users can't understand. On the other hand, I am also in the team and I will develop the corresponding requirement afterwards.
As of now what I have seen is he tries to impress people and because he is very talkative he doesn't think before speaking.