I can't help but leave a review for this.. This is a really great course that kindly explains the foundational basics for people who haven't dealt with large-scale system design and helps you understand what you need to learn. It's also really, really great that they provide course materials that include all the theory we learned for review purposes. Most importantly, while some courses just roughly go through examples and teach in an unsatisfying way like taking a dump and not wiping properly, this one thoroughly completes one example project including test code, so there's a lot to learn from it. I especially think this is a great course that people working without a mentor must take to advance to the intermediate level.