Svelte 5 is often called “faster by default” while React 19 is labeled “heavy but mature.” In reality, performance differences matter far less than architecture, team scale, and predictability. This article cuts through benchmarks and explains what actually matters in production.

Utility-first CSS frameworks like Tailwind solved real problems — but modern CSS has quietly caught up. With container queries, cascade layers, @scope, and native math, teams are rethinking whether massive utility layers still make sense in long-lived production systems.

React 19 is now stable and shipping quietly into production apps. No flashy APIs, no hype-driven features — just a series of deep fixes that materially change how React behaves at scale. This is what actually changed, why it matters, and what senior frontend engineers should (and should not) refactor.

SPAs dominated frontend for a decade. SSR, streaming, and island architectures are now reshaping performance, DX, and scalability. This guide breaks down where each model wins—and where it fails.

Browser‑resident AI agents like Claude-in-Chrome and emerging AI browsers are no longer demos. They change how we think about DOM access, automation, testing, and frontend architecture. Here’s what senior engineers should realistically prepare for.

Generative UI systems can now design, generate, and operate entire frontends from prompts. This isn’t a demo trend—it’s an architectural shift every frontend engineer should understand.