Obinna Ezedei’s Post

Most frontend engineers never learn why their app breaks at scale. They know every React hook. Every Next.js optimization flag. They can diff server components from client components in their sleep. But ask them what happens when 10,000 users hit this page at the same time — silence. Senior frontend engineering is not about knowing more APIs. It’s about reasoning in constraints: performance budgets, failure modes, degradation paths. Over 50% of sites still fail Core Web Vitals as of 2025 (BrightVessel). A 0.1s improvement in load time drives an 8.4% conversion lift. That’s not a CSS problem. That’s a system design problem. The companies getting this right — Meta, Stripe, Airbnb — now hold frontend engineers to the same standard as backend. They want to know what happens when the CDN is down, the bundle is 3MB, and the user is on a 4G connection. 34% of enterprise apps use micro-frontend architecture today. Not because it’s trendy — because component monoliths fail under real deployment constraints. If you’re preparing for senior-level frontend work, stop memorizing APIs. Start designing for what can go wrong. #frontend #systemdesign #softwareengineering #react #nextjs #webdev #architecture

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Most scale issues I've seen weren't about missing knowledge — they were about missing ownership. Frontend engineers who never got to see the CDN config, the bundle analyzer, or the RUM data. Hard to design for failure modes you're not allowed to observe.

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