TruongDQ

Comprehensive reference for system design across UI design systems, frontend, mobile, backend HLD, low-level design, SRE, SaaS, and migration. Use this skill for architecture decisions, scaling, database selection, RAG, agents, observability, and cost optimization. Trigger on: "how should I design X", "which is better X or Y", "best practice for Z", "edge case in X", "how to handle X at scale", "is X deprecated". Always follow the user's preferred language for communication while referencing English knowledge.