Choyeon

Practical Google Core Web Vitals playbook: LCP via preconnects/image-priority/CDN, CLS elimination via image dimensions/font-loading/placeholders, INP via long-task splitting + debouncing.

Advanced patterns: CQRS separate read/write models for query performance; Event Sourcing using events as source of truth for audit + time travel. Covers consistency, snapshots, idempotency pitfalls and anti-patterns.

Comprehensive JWT vulnerability playbook: alg confusion attacks, key brute force, KID injection, replay defenses. Compare OAuth2(+PKCE), OIDC, SAML 2.0 across dimensions for protocol selection.

Tune Linux across CPU/mem/IO/net: perf for CPU sampling, bpftrace one-liners for kernel tracepoints, BCC classics biolatency/offcputime to pinpoint production bottlenecks with real incident methodology.

Full K8s Pod state machine Pending→Terminated, PostStart/PreStop hooks, Init Container dependency guarantees, Sidecar patterns (istio-proxy, log collectors), and zero-downtime graceful termination configs.

Complete Go native concurrency guide: lightweight goroutines, CSP-style channels, sync.WaitGroup, Context cancellation, worker pool patterns, and goroutine leak prevention.

Master Rust's most unique concepts: ownership rules, mutable/immutable borrowing constraints, lifetime annotations. Compile-error examples + fixes to think like the Borrow Checker for safe zero-cost code.

Deep Python concurrency comparison: ThreadPool for IO-bound, ProcessPool bypassing GIL for CPU-bound, asyncio coroutines for ultra IO. 4-dimension decision tree with perf and complexity.

Node.js performance diagnostics: clinic.js one-click reports, reading flamegraphs for hot functions, event-loop blockers, memory leak stacks to pinpoint CPU/memory bottlenecks.

Astro innovations: Islands Architecture for minimal JS with partial hydration, Content Collections for type-safe Markdown/MDX management, ultra-fast zero-JS static sites.

End-to-end Rust to WASM setup: wasm-pack toolchain, wasm-bindgen type bindings, JS sync/async invocation, TypedArray memory sharing for compute-heavy browser workloads.

Modern responsive CSS pillars: Container Queries for component-level responsiveness based on parent size (not viewport), plus :has() parent selector for ancestor styling based on descendants.