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Mastering Frontend Fundamentals: A Mock Interview Guide

Prepare for your frontend developer interview with essential concepts in HTML, CSS, React, and JavaScript, as demonstrated in a mock interview.

5 min readMar 8, 2026

AI for Code Review and Refactoring

Using AI to review PRs, suggest refactors, and improve code quality. What to automate and what to keep human.

Writing Effective Slack and Async Updates

When to write, how to structure messages, and how to get responses without overwhelming. Async communication that works.

Running Effective 1:1s

How to run one-on-ones that build trust, surface issues, and drive growth. Agenda, frequency, notes, and follow-through.

AI-Assisted Debugging

Using AI to narrow down bugs, interpret stack traces, and suggest fixes. How to prompt and when to trust the output.

Running Effective Meetings

Agenda, timeboxing, outcomes, and when to skip the meeting. Making meetings worth everyone's time.

Delegation for Tech Leads

What to delegate, how to brief clearly, and how to follow up without micromanaging. Building ownership and scaling your impact.

DOM and Events

Event loop, event delegation, bubbling and capture, target vs currentTarget, and how to work with the DOM and events in JavaScript.

6 min readFeb 27, 2026

Fetch and Async

Using fetch, async/await, error handling, loading states, and patterns for data loading in the browser.

Design a Search Results Page

System design for a search results page: filters, sorting, facets, infinite scroll vs pagination, and performance at scale.

Feature Flags and A/B Testing

Ship behind flags, run experiments, and roll out features gradually. How to implement feature flags and A/B testing in frontend applications.

Design a Comments Thread

System design for nested comments: replies, pagination, real-time updates, and moderation. Frontend architecture and data shape.

Internationalization (i18n)

Supporting multiple languages and regions: locales, formatting, RTL, and translation workflows for frontend applications.

AI-Powered Frontend Development: Tools, Workflows, and Limits

Explore the current landscape of AI tools for frontend development—from code generation to testing—and learn how to integrate AI into your workflow effectively.

BeginnerSeniorArchitectFounder

Frontend System Design

A structured framework for approaching frontend system design interviews and real-world architecture decisions.

Presenting to Executives: A Technical Leader's Guide

Learn how to structure and deliver technical presentations that resonate with executive audiences—focusing on impact, timelines, and risk.

How Browsers Render Web Pages

A deep dive into the browser rendering pipeline, from HTML parsing through the critical rendering path to paint and composite.

First 90 Days as a Tech Lead

A phased approach to succeeding in your first 90 days as a tech lead: listen, build relationships, and set direction.

Design Autocomplete / Typeahead Search

System design for building a Google-like autocomplete search component: debouncing, caching, keyboard navigation, race conditions, and mobile considerations.

Building AI Features in Web Applications

Learn how to add AI-powered features to your web apps—from chat interfaces to intelligent search—with practical guidance on LLM integration and UX considerations.

Micro-Frontends

When and how to adopt micro-frontends: implementation approaches, trade-offs, and common challenges.

An Engineer's Guide to Storytelling

Discover why storytelling matters in engineering and how to use proven frameworks to craft compelling technical narratives that influence and persuade.

Modern CSS Layout

Master Flexbox, CSS Grid, and modern layout features like container queries and :has() for responsive, maintainable interfaces.

Building a Code Review Culture That Works

Learn why code reviews matter beyond bug hunting and how to establish effective review processes that improve team quality and collaboration.

Design a Social Media News Feed

System design for a Twitter/Facebook-style news feed: infinite scroll, virtualization, optimistic updates, real-time updates, lazy loading, and content ranking.

Prompt Engineering for Developers

Master the art of crafting effective prompts for AI coding assistants—from basic principles to advanced patterns for code generation, debugging, and frontend tasks.

BeginnerSeniorArchitect

State Management at Scale

Master state architecture for large frontend applications: when to use local vs global state, library trade-offs, server state, and state machine patterns.

Writing Technical RFCs

Learn when and how to write effective Request for Comments documents that drive alignment, capture design decisions, and get technical proposals approved.

JavaScript Language Basics

Core JavaScript concepts: variables, functions, control flow, objects, arrays, scope, error handling, and modern ES6+ syntax every frontend developer needs.

Mentoring Engineers

Effective mentoring for senior engineers: 1:1s, growth plans, feedback, career transitions, and building a learning culture.

Design a Real-Time Chat Application

System design for Slack/WhatsApp-style chat: WebSocket management, message ordering, offline support, typing indicators, read receipts, search, and file uploads.

AI and Design Systems

How AI is transforming design system workflows — from component generation to documentation, visual testing, and Figma-to-code pipelines.

Design Systems

A comprehensive guide to building and scaling design systems: tokens, component APIs, Storybook, versioning, and adoption strategies.

Selling Technical Decisions

Technical merit alone doesn't win arguments. Learn how to frame trade-offs, build alliances, and persuade stakeholders to support your technical vision.

Advanced JavaScript

Deep dive into the event loop, async patterns, prototypes, closures, functional programming, and JavaScript gotchas every senior developer should know.

Technical Roadmapping

Building and communicating technical roadmaps: balancing features, tech debt, and innovation, with frameworks for quarterly planning.

ArchitectFounder

Design an E-Commerce Product Page

System design for an Amazon-style product page: image gallery and zoom, variant selection, pricing, add-to-cart, reviews, related products, SEO, and performance.

The Future of Frontend Engineering with AI

How AI is reshaping frontend development — what's changing, what stays the same, and how to prepare your career for the next era.

Build Tooling Deep Dive

Understanding modern JavaScript build tools: Webpack vs Vite vs Turbopack, module systems, tree shaking, and CI/CD optimization.

Cross-Functional Collaboration

How frontend engineers can work effectively with product managers, designers, and backend teams — building shared understanding and reducing friction.

HTML Fundamentals

Document structure, semantic elements, forms, media, links, accessibility basics, and SEO-friendly HTML practices for building solid web pages.

Managing Tech Debt

Understanding, quantifying, and managing tech debt: types, tracking, making the case to leadership, and prevention strategies.

Design a Performant Image Carousel

System design for an image carousel/slider: touch/swipe, lazy loading, preloading, responsive breakpoints, autoplay, accessibility, and animation performance.

AI for Testing and Quality Assurance

How AI is transforming frontend testing — from generating test cases and catching visual regressions to identifying flaky tests and automating accessibility audits.

Frontend Security

Essential frontend security: XSS, CSRF, CSP, authentication patterns, secure storage, and supply chain security.

Writing for Engineers

Why writing matters in engineering—and how to write clear documentation, effective messages, and professional content that advances your career.

Advanced HTML and Accessibility

WCAG guidelines, ARIA attributes, accessible forms, focus management, screen reader testing, color contrast, anti-patterns, and automated a11y tools.

Hiring Frontend Engineers

A comprehensive guide to hiring frontend talent: defining needs, job descriptions, interview design, evaluation, and onboarding.

ArchitectFounder

Design a Video Player

System design for a custom video player like YouTube: controls, progress thumbnails, quality selection, subtitles, keyboard shortcuts, fullscreen, PiP, buffering, and adaptive bitrate (HLS/DASH).

Virtualization and Windowing

Master virtual scrolling for high-performance lists and tables: when to use it, library trade-offs, variable-height challenges, and integration patterns.

React Basics

Introduction to React: JSX, components, props, state, events, conditional rendering, lists, and core hooks (useState, useEffect) for building UIs.

Design a Spreadsheet Application

System design for a spreadsheet like Google Sheets: virtualized grid, cell editing, formulas, undo/redo, selection, copy/paste, column/row resizing, and performance at scale.

Performance Optimization Patterns

Comprehensive patterns for frontend performance: code splitting, lazy loading, prefetching, bundle analysis, memory management, and RUM.

Advanced React Patterns

Custom hooks, compound components, render props vs hooks, memoization, Context patterns, Suspense, error boundaries, and React 19 Server/Client Components.

Design a Drag-and-Drop Kanban Board

System design for a Kanban board like Trello: drag-drop between columns, reordering, optimistic updates, animations, mobile touch, multi-select, undo, and real-time collaboration.

Rendering Strategies

CSR, SSR, SSG, RSC, and streaming: a comprehensive guide to choosing and mixing rendering strategies for modern frontends.

CSS Fundamentals

Master the core building blocks of CSS: selectors, the box model, specificity, units, colors, typography, positioning, and display—the foundation of web styling.

Design a Frontend Notification System

System design for toasts, badges, and notification center: queue management, auto-dismiss, priority, read/unread, real-time delivery (SSE/WebSocket), filtering, push notifications, and overflow behavior.

Caching Strategies for the Frontend

HTTP headers, browser cache layers, CDN, application-level caching, service workers, and common pitfalls.

Web Performance Fundamentals

Understand Core Web Vitals, measuring tools, image optimization, caching, and critical rendering path—build faster, more responsive web applications.

Design a Collaborative Document Editor

System design for a collaborative editor like Google Docs: real-time sync (CRDTs vs OT), cursor presence, rich text (contentEditable vs ProseMirror/Tiptap), conflict resolution, offline, version history, comments, and permissions.

Monorepo Architecture

When to use monorepos, tooling comparison, workspace structure, build orchestration, and scaling challenges.

Testing Fundamentals

Learn the testing pyramid, unit testing with Jest/Vitest, Testing Library for React, mocking, integration patterns, E2E with Cypress/Playwright, and TDD workflow.

Design a Dynamic Form Builder

System design for Typeform/Google Forms–style form builders: schema-driven rendering, field types, validation, conditional logic, multi-step wizard, and submission handling.

Frontend API Layer Design

Design a robust API abstraction layer between your UI and backend: REST vs GraphQL, BFF pattern, client architecture, error handling, and type-safe contracts.

TypeScript Essentials

Learn why TypeScript, basic types, interfaces vs types, unions and intersections, generics, type narrowing, utility types, and TypeScript with React.

Design an Analytics Dashboard

System design for Grafana/Datadog–style dashboards: chart rendering, time range selectors, auto-refresh, responsive grid, widgets, drill-down, and large dataset handling.

Frontend Observability and Monitoring

Comprehensive guide to seeing what's happening in production: error tracking, performance monitoring, RUM vs synthetic, session replay, alerting, and feature flag observability.

Design a File Upload Component

System design for Dropbox-style file upload: drag-and-drop, chunked uploads, progress, retry, pause/resume, thumbnail previews, and cancellation.

Progressive Web Apps

Build installable, offline-capable web apps: Web App Manifest, service worker lifecycle, caching strategies, background sync, push notifications, and testing PWAs.

Design a Calendar / Scheduling Application

System design for Google Calendar–style apps: day/week/month views, event overlap handling, drag to create/resize, recurring events, timezones, and multi-calendar overlay.

Web Workers and Multithreading

Offload CPU-intensive work from the main thread: Web Workers, Comlink, SharedArrayBuffer, worker pooling, and when to use workers vs requestIdleCallback.

Design a Multi-Step Checkout Flow

System design for Shopify-style checkout: step validation gates, address autocomplete, Stripe Elements, order summary sidebar, form persistence, and mobile optimization.

Error Handling and Resilience

Build frontends that fail gracefully: error boundaries, global handlers, retry patterns, circuit breakers, optimistic updates, and postmortem culture.