Present Continuous and Going To

• I am going to get a new job. (= I intend/plan to get a job.)

• I am getting a new job. (= It is already decided / arranged.  Here the focus is on the arrangement.)

The present continuous is used to talk about arrangements for events at a time later than now. There is a suggestion that more than one person is aware of the event, and that some preparation has already happened. e.g.

• I'm meeting Jim at the airport = Jim and I have discussed this.
• I am leaving tomorrow. = I've already bought my train ticket.
• We're having a staff meeting next Monday = all members of staff have been told about it.