Focus areas

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Deep-dive into topical focus areas critical for front end interviews.
9 topical deep-dives
Code in browser
Official solutions and tests
The vast breadth of topics that could come up during a front end interview can be daunting.To simplify your preparation, we've carefully organized the entire front end domain into 9 critical focus areas, each covering the most frequently tested topics in interviews.

JavaScript Engineering

JavaScript Polyfills
Gain proficiency in front end fundamentals by implementing JavaScript and DOM APIs from scratch
26 questions
Topics
JavaScriptClosure
Async Operations
Sharpen your skills in asynchronous programming by practicing the use of async/await, Promises, and callback functions.
33 questions
Topics
AsyncClosure
Lodash Functions
Strengthen your proficiency in JavaScript through writing Lodash functions from scratch.
28 questions
Topics
ClosureJavaScript

User Interface Development

DOM Manipulation
Familiarize with selecting elements using CSS selectors, traverse the DOM hierarchy, and manipulate their properties, content, and styles.
10 questions
Topics
BrowserWeb APIsTree
Forms
Master the art of building interactive and user-friendly forms.
10 questions
Topics
AccessibilityBrowser
Design System Components
Elevate your front-end skills by practicing the creation of front end design system components.
15 questions
Topics
UI componentAccessibilityCSS
Accessibility
Practice developing inclusive and accessible web experiences.
12 questions
Topics
AccessibilityUI component
State Management
Train your skills in designing complex state and implementing operations to manipulate state.
17 questions
Topics
UI componentOOP

Computer Science Foundations

Data Structures & Algorithms
Hone your computer science fundamentals by implementing important data structures and algorithms from scratch.
22 questions
Topics
GraphTreeRecursion

Focus Areas for Front End Interviews

Front end interviews cover such a vast range of possible topics that it can be hard to wrap your head around. In an ideal world, you should start with the topics that are most likely to come up and where you're weakest.

To make your preparation more focused, we have meticulously organized the entire front end interview domain into 9 critical focus areas. These bite-sized lists of practice questions are designed to help you deep-dive into the key topics that are most frequently tested in front end interviews.

Key Features

1. Quality materials by credible engineers: All the materials on the platform—including every question, solution, test case, and focus area—have been written and curated by big tech ex-interviewers who have conducted numerous interviews at top tech companies. We strive in every piece to deliver streamlined, high quality content.

2. Deep dive into essential topics: Our focus areas provide in-depth coverage of the 9 most critical topics for front end interviews. These include everything from JavaScript engineering to UI development and computer science foundations.

3. Streamlined preparation: By breaking down the front end domain into manageable sections, our focus areas simplify your preparation process. You can prioritize the topics where you're weaker first and then tackle the other areas if time permits.

4. Mock interview environment: Practice makes perfect, and it doesn't have to be a hassle. Our platform allows you to code directly in your browser. Moreover, our coding workspace is built to be a realistic environment that closely replicates actual interview conditions. This setup helps you get accustomed to the tools and situations you'll face in your interviews.

5. Official solutions and tests for every question: Each practice question within our focus areas comes with official solutions and tests. These solutions are crafted by experienced engineers and are designed to provide clear, detailed explanations that help you understand the best approach to each problem.