Frontend Practices

The practical, tooling, and systems knowledge interviews test beyond pure language syntax — APIs, architecture, workers, and the infrastructure around the code.

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APIs, REST & Data BindingIntermediateHow a frontend actually consumes an API — and how 'binding' data to the UI is just state driving a render, the same idea from the useState lesson.14 min · 0/2 questions correct
Data Layer vs Design Layer: MV* ArchitectureIntermediateWhy big apps separate 'what the data is' from 'how it looks' — and how that one idea shows up as MVC, then Flux/Redux, then React's own one-way data flow.14 min · 0/2 questions correct
Web WorkersIntermediateJavaScript is single-threaded — one heavy computation freezes the whole page. A Web Worker runs real JavaScript on a separate thread so it doesn't have to.12 min · 0/2 questions correct
AWS Basics for Frontend DevelopersIntermediateNot a certification — just the handful of AWS services a frontend developer actually runs into, and the caching/statelessness gotchas that trip people up.13 min · 0/2 questions correct
CI/CD FundamentalsBeginnerCI catches problems early with fast automated feedback; CD ships validated changes — and 'delivery' vs 'deployment' is a real distinction people blur together.12 min · 0/2 questions correct
Git: Beyond Add, Commit, PushIntermediateMerge vs rebase, resolving real conflicts, and the scenario questions interviews actually ask once they're past 'what does git commit do'.14 min · 0/2 questions correct
HTTP Caching & ETagsIntermediateBefore a CDN ever gets involved, the browser and server already negotiate caching over plain HTTP headers — Cache-Control says how long to trust a copy, ETag says how to check if it's still valid without re-downloading it.13 min · 0/2 questions correct
CORS & the Same-Origin PolicyIntermediateThe browser blocks your own JavaScript from reading responses from a different origin by default — CORS is the server's explicit permission slip that opts back in, selectively.12 min · 0/2 questions correct
Authentication: JWTs vs SessionsIntermediateTwo different answers to 'how does the server remember you're logged in on the next request' — one keeps state on the server, one packs it into the token itself. Neither is simply 'the modern one.'14 min · 0/2 questions correct
WebSockets & Real-Time DataBeginnerHTTP is a request, then a response, then the connection's job is done — WebSockets keep one connection open indefinitely so either side can send a message at any moment, which is what real-time features actually need.12 min · 0/2 questions correct
Core Web Vitals & Performance MetricsIntermediateGoogle's three specific, measurable numbers for 'does this page feel fast' — replacing vague impressions with metrics you can actually optimize against and that affect real search ranking.13 min · 0/2 questions correct
Bundling & Tree ShakingIntermediateA build tool combines dozens of source files into a handful of optimized bundles — and tree shaking is specifically the step that deletes exports nobody actually imports, before that bundle ever ships.13 min · 0/2 questions correct