I know it sounds cold but without knowing more about the company you work for my suggestion is to say nothing and start looking. Unless you have a new job lined

I know it sounds cold but without knowing more about the company you work for my suggestion is to say nothing and start looking. Unless you have a new job lined up, all the papers signed, and a start date never tell your current company. At best they are happy for you, at worse they are vindictive and either fire you immediately (an no, unemployment is neither easy/simple nor is it much money normally) or make your life hell until you do leave. There is also no guarantee that your team will be safe if you tell them you are leaving. They might decide to just get rid of the whole team and leave another team whole (instead of taking a pound of flesh from each team). Again, without knowing what your current company is like we can only speculate but tread carefully.