Problem Library

Browse curated coding challenges and your simulation-generated problems. Filter by difficulty, type, or company tags.

12 of 37 problems

Understanding CORS: Cross-Origin Resource Sharing for Frontend Security

easy

Theory

interview-prep · theory-practice

Flexbox vs. CSS Grid: Choosing the Right Layout Tool

Theory

interview-prep · theory-practice

Optimizing CRP: Dynamic Content, Third-Party Scripts, and Performance

hard

Theory

frontend

performance

Critical Rendering Path

browser internals

interview-prep · theory-practice

Optimizing React Applications: Server vs. Client Components Strategy

Theory

interview-prep · theory-practice

Virtual DOM Explained: Its Role in React's Performance

Theory

interview-prep · theory-practice

Demystifying 'this' in JavaScript: Context & Binding Rules

Theory

interview-prep · theory-practice

Leveraging Closures: Beyond Basics for Advanced Frontend

Theory

interview-prep · theory-practice

Frontend System Design: Real-time Chat with Scalability and Offline Support

hard

System Design

system-design

frontend-architecture

real-time

scalability

interview-prep · system-design-practice

E-commerce Product Listing: Scalable Frontend Design

medium

System Design

system-design

frontend-architecture

scalability

performance

interview-prep · system-design-practice

Build a Robust useFetch Hook in React with Loading & Error States

Machine Coding

interview-prep · frontend-practice

Build an Accessible React Tabs Component with Dynamic Content

Machine Coding

interview-prep · frontend-practice

React Autocomplete Search: Dynamic Destination Typeahead UI

Machine Coding

interview-prep · frontend-practice