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Web/Frontend Interview Guide

Work in Progress

This section is currently in beta. Content may change frequently and some topics are not yet covered fully.

Frontend interviews assess candidates on building performant, accessible, and scalable user interfaces. This section covers frontend-specific system design and architecture.

Interview Types​

Frontend System Design​

Frontend system design interviews cover:

TopicDescription
Component architectureDesign patterns, composition, reusability
State managementLocal vs global state, data flow
Performance optimizationLoading, rendering, runtime performance
AccessibilityWCAG compliance, assistive technology support

JavaScript and Framework Deep Dives​

TopicDescription
Event loopCall stack, task queues, microtasks
Framework internalsReact/Vue/Angular reconciliation, rendering
Browser APIsDOM, Web Workers, Intersection Observer
Build toolsBundling, tree shaking, code splitting

UI Coding​

TaskSkills Tested
Component implementationFramework usage, API design
DOM manipulationVanilla JavaScript, event handling
CSS layoutsFlexbox, Grid, responsive design
Accessibility implementationARIA, keyboard navigation, focus management

Topics​

Performance Optimization​

Techniques for optimizing loading, rendering, and runtime performance.

Design a News Feed​

Frontend architecture for infinite scrolling feeds with virtualization.

Design Autocomplete​

Search input with debouncing, caching, and keyboard navigation.

Frontend Architecture Patterns​

PatternDescriptionUse Case
Component-based architectureUI as composable componentsAll modern frameworks
State managementCentralized state (Redux, MobX, Zustand)Complex data dependencies
Micro-frontendsIndependent, deployable frontend modulesLarge teams, separate deployments
Server-side renderingHTML generated on serverSEO, initial load performance
Progressive web appsOffline-capable web applicationsMobile-like experience
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