Technical support engineers use a variety of tools to perform their job. The Plaid interviewer will ask you about these to determine which tools you use and whether they are similar to their technical support team's. You can respond to this question by describing general resources or detailing specific tools. Your answer will depend on how much information you gathered during your research before the interview. You can either align your answer with the technologies Plaid currently uses or refer to and recommend different tools and technologies which may improve their operations. While this later strategy is risky, it could distinguish you from the other candidates and enhance your chances of getting the job.