--'s honest review, Practical Financial Backend Engineering from a Toss Developer Serving 30 Million MAU: Outbox, Idempotency, and Dual Write course

I usually don’t leave reviews like this, but as someone who’s new to blockchain, I find the lectures somewhat difficult to follow. The lectures introduce blockchain-related terms and libraries, but without knowing what each one does, it’s hard to take in the overall flow. For example, the materials shown during the explanation only say, “The server authorizes the transfer using a private key.” That alone makes it difficult to remember or understand the various scenarios the instructor discusses. As I mentioned in the Q&A section, I understand that the instructor wanted to demonstrate a variety of scenarios. But in a professional setting, when explaining an unfamiliar feature to a colleague, you would first explain why it’s needed and what background they should know. Then, once you explain how it works in practice, it’s easier for someone hearing about it for the first time to follow along. I think the lectures would have been much easier to understand if they had followed that order for beginners like me. I hope you’ll take another look at the lecture sequence and materials with this in mind. These days, you can look up all kinds of things using AI, so I was expecting a paid course to provide explanations directly from the instructor, walking through the basics step by step. Instead, most of the code and course materials gave me the impression that they had been written by AI, which was disappointing and prompted me to leave this review.