A Defining Testing Objectives Developer is responsible for outlining the specific goals and targets of a software testing project. They identify what needs to be tested and to what extent, ensuring all functionalities, features, and aspects of the software are covered. They also define the success criteria for each test, which can include error rates, response times, or other performance indicators. This involves a deep understanding of the software, its intended use, and the potential issues that could arise. Their objectives guide the testing process, providing a clear direction and helping to measure the effectiveness of the testing efforts.