Hack Frontend Community

Frontend Interview Preparation Guide

Welcome to Frontend Interview Preparation Guide! This material will help you systematize knowledge, practice solving tasks and confidently pass interview for frontend developer position.

What to Expect at Interview?

Frontend interview usually consists of several stages:

  1. Theoretical Questions : testing knowledge of HTML, CSS, JavaScript and frameworks.
  2. Practical Tasks: writing code, solving algorithmic tasks, layout.
  3. Behavioral Interview: discussing your experience, work approaches and soft skills.

How to Prepare?

📚 Theory

Refresh your knowledge on key frontend development topics. Here are main sections to study:

HTML

  • Semantic markup.
  • Forms and accessibility.
  • Meta tags and SEO.

CSS

  • Flexbox and Grid.
  • Responsive layout.
  • Preprocessors (SASS/SCSS).
  • Methodologies (BEM, SMACSS).

JavaScript

  • Basics: data types, functions, loops.
  • Asynchrony: Promise, async/await.
  • ES6+: arrow functions, destructuring, modules.
  • OOP: classes, prototypes, inheritance.

Frameworks

  • React: component approach, hooks, state management (Redux, Context API).
  • Routing (React Router).
  • Vue or Angular, if you're familiar with other ecosystems.

Tools

  • Git: basic commands, branches, merge.
  • DevTools: debugging and profiling.
  • CI/CD: Testing and deployment automation.
  • Webpack/Vite: project building.

Testing

  • Unit tests (Jest, React Testing Library).
  • Integration tests (Cypress, Puppeteer).

Performance

  • Loading optimization: lazy loading, code splitting.
  • Metrics: Lighthouse, Core Web Vitals.

Patterns and Principles

  • MVC, MVVM, Flux: architectural patterns for separating responsibilities in applications.
  • SOLID: set of principles for creating scalable and maintainable systems.
  • YAGNI (You Aren't Gonna Need It): implementing only necessary functionality.
  • KISS (Keep It Simple, Stupid): striving for simple solutions.
  • DRY (Don't Repeat Yourself): avoiding code duplication.

Security

  • XSS, CSRF, HTTPS.

💻 Practice

Solve tasks to consolidate knowledge and learn to apply them in practice.

Algorithms and Data Structures

  • Working with arrays and objects.
  • Basic algorithms: sorting, search, recursion.

JavaScript Tasks

  • Implementing functions: debounce, throttle, deepClone.
  • Working with asynchrony: sequential promise execution.

Layout

  • Layout design from Figma.
  • Make responsive layout.
  • Implement animation.

🎯 Interview Questions

Here are examples of questions that may be asked:

Theoretical

  • What's difference between let, const and var?
  • How does event loop work in JavaScript?
  • What is Virtual DOM?

Practical

  • How would you optimize website performance?
  • How to implement infinite feed?

Behavioral

  • Tell about most complex project you worked on.
  • How do you resolve conflicts in team?

Preparation Resources

Theory Section

Practice Section

Hack Frontend

Hack Frontend – unique platform where absolutely everything is collected in one place: from theoretical materials to practical assignments, real cases and current tasks.

Books

Tip from Professionals:

Start with theory, then move to practice. Solve tasks and explain how you think to get used to interview format.

Good luck at interview! 🚀