SolidJS & SolidStart Expert Development Skill Senior/Lead engineer-level guidance for building production-ready applications with fine-grained reactivity. Core Philosophy (KISS, Less is More) Project Initialization SolidStart (Recommended for 95% of projects) Vanilla SolidJS (Client-only SPAs) Decision matrix : Use SolidStart unless you're building: embeddable widgets, micro-frontends, or have strict no-server requirements. Project Structure (Production-Ready) Reactivity Fundamentals Signals (Atomic State) Stores (Complex State) Resources (Async Data) TanStack Integration TanStack Query (Serv…