Tango Full Stack Software Engineer interview questions

Was contacted by a recruiter about the position. I currently am not looking for a new job but the benefits did beat out my current job. I talked on the phone with the recruiter and seemed that everything went well and sent me time to meet with a Hiring Manager. The hiring manager was in the same city as me and their office was like a 5-10 min drive from my work, however I was scheduled to talk on the phone. I thought the scheduling of time was pretty cool, it helps with the phone/email tag of how to sync up schedules. The interview with the hiring manager was like 20 minutes long. He asked very few questions. First one was asking me about how I got into technology. Second question was something about how i would debug a system that is slow. Third question was an extension of the first stating "your system is slow because there is a message queue and one message is not being pulled off how do you fix this issue". I understand that production issues are something all software engineers have to work on but interviewing for a Full Stack Developer position i expected to be asked about the technology stack I work with, projects that I worked on and issues that I personally ran into and how i fixed them, not super open ended questions based on bad system design.