This is my first course review. As a job seeker, I believe that with the recent advancements in AI, code implementation has largely become an area that can be resolved. So, as I pondered what would be important, the thought suddenly struck me, "Ah, now it will be important to design systems well, and system design communication will be crucial." Therefore, while reading "Fundamentals of Large-Scale System Design 1," which was introduced in the lecture, just as I thought it would be great if there was a lecture explaining things from a practitioner's perspective, I seemed to have stumbled upon this lecture and purchased it immediately. Personally, it was immensely helpful in grasping the big picture. Even for technologies I had never used but only heard of, I was able to broaden my background knowledge by thinking, "Ah, this could be used in this kind of situation," and I learned a lot about what needs to be considered in the early stages of an actual project. Why did you only appear now...? Not only that, but I also learned how to present projects effectively in an interview as a backend developer. I genuinely find documentation tedious, but from now on, I will diligently document the troubleshooting I've performed. Thank you for this truly excellent lecture. The PPT materials were very easy to read, and I loved the beautifully designed lecture materials! I don't know what other lectures you're planning next, but I will trust and enroll in them :>