https://www.anhdh.net/en/blog Backend & Cloud engineering notes — deep dives into distributed systems, databases, caching, and the infrastructure that keeps software running at scale. Practical, no-fluff writing for engineers who care about how things actually work. en-US anhdh.cv@gmail.com (Do Hung Anh) anhdh.cv@gmail.com (Do Hung Anh) Sun, 23 Aug 2026 00:00:00 GMT https://www.anhdh.net/en/blog/c4-model https://www.anhdh.net/en/blog/c4-model Your architecture diagram has 40 boxes, 200 arrows, and nobody understands it. The C4 model fixes that with four zoom levels — like Google Maps for your codebase. Sun, 23 Aug 2026 00:00:00 GMT anhdh.cv@gmail.com (Do Hung Anh) mediumsystem-designarchitecturebackend