Communication with the programmer you have an issue with, and communication with the leadership in the project. If you have personal issues with the programmer

Communication with the programmer you have an issue with, and communication with the leadership in the project. If you have personal issues with the programmer, such as their attitude or behavior, bring them up in a personal setting with the programmer himself. Your issues regarding the way decisions are made within the project should be raised with the leadership. If you don't communicate your issues to the responsible parties then you can't expect them to change.