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Frontend

Designing a High-Performance Web Application in Frontend System Design

Performance is one of the most important aspects of frontend engineering. Users expect applications to load instantly, respond immediately, and feel smooth regardless of their device or network conditions. Building a performant application is not about a single optimization. It requires thoughtful architecture across networking, rendering, caching, asset delivery, JavaScript execution, and user interactions. In this article, we'll design a high-performance frontend architecture and explore where optimizations should be applied throughout the lifecycle of a web application.

Jul 15, 2026·6 views

Frontend

Zig-Zag Grid Rendering (Google Frontend Interview) | Platform Round

A classic platform-round problem asked at Google where you build a dynamic zig-zag numbered grid using HTML, CSS, and JavaScript. Given an input n, generate an n × n grid where numbers alternate direction in each row. This tests DOM manipulation, logical thinking, and clean UI rendering under real interview constraints.

Jul 12, 2026·16 views

Frontend

Designing a Video Streaming Platform in Frontend System Design

Modern video streaming platforms like YouTube, Netflix, and Prime Video deliver a seamless viewing experience despite varying network conditions and large media files. A frontend video player must efficiently handle adaptive streaming, buffering, caching, playback controls, subtitles, quality switching, and playlist management while maintaining smooth performance across devices. This problem tests your understanding of media APIs, browser rendering, networking, performance optimization, and frontend architecture.

Jul 11, 2026·24 views

Frontend

Designing a File Upload System in Frontend System Design

File uploads appear simple on the surface, but building a production-ready upload system involves much more than selecting a file and sending it to a server. A robust uploader must handle large files, network failures, retries, progress tracking, pause/resume, concurrent uploads, and efficient resource management while providing a smooth user experience. This problem tests your understanding of asynchronous workflows, browser APIs, networking, state management, and scalable frontend architecture.

Jul 10, 2026·10 views

Frontend

Promise Dependency Pool (Uber Frontend Interview) | Screening Round

A real-world async control problem inspired by Uber interviews. Given multiple promises with dependencies (e.g., A depends on B & C, B depends on D & E), design a system to execute them in the correct order. This tests your understanding of JavaScript promises, dependency graphs, concurrency control, and writing clean, scalable async orchestration logic.

Jul 08, 2026·14 views

Frontend

Designing a Feature Flag Architecture in Frontend System Design

Feature flags (also called feature toggles) allow developers to enable or disable features without deploying new code. Modern applications use feature flags for gradual rollouts, A/B testing, canary releases, emergency kill switches, and user segmentation. A well-designed frontend feature flag system enables rapid experimentation while keeping applications performant, scalable, and resilient.

Jul 08, 2026·14 views

Frontend

Tab Switcher with State Persistence (Atlassian Frontend Interview) | UI Coding Round

A practical UI coding problem asked in interviews at Atlassian focuses on building a tab switcher component. Users can switch between multiple tabs, each displaying different content. As a follow-up, the selected tab should persist using query parameters so the same state is restored on refresh or when sharing the URL.

Jul 06, 2026·2 views

Frontend

Designing a Chat System in Frontend System Design

Chat systems are one of the most common real-time frontend challenges, used in messaging apps, support systems, and collaborative tools. The goal is to build a responsive UI that can send, receive, and display messages in real time while handling network delays, ordering, and state consistency. This problem tests your understanding of real-time data flow, optimistic updates, and UI synchronization.

Jul 06, 2026·14 views

Frontend

Designing a Kanban Board (Jira-like) in Frontend System Design

A Kanban board is a task management system where items are organized into columns and can be moved across stages using drag and drop. Tools like Jira use this model extensively. This problem tests your ability to handle complex UI interactions, state management, and efficient updates while maintaining a smooth user experience.

Jul 04, 2026·2 views

Frontend

Nested Folder Explorer (Atlassian Frontend Interview) | Platform Round Problem

A commonly asked frontend problem in interviews at Fleek, Atlassian, and Zepto focuses on building a nested folder/file structure similar to an IDE. The task involves designing a data structure to represent folders and files, and rendering it recursively in JavaScript. It tests your understanding of tree structures, recursion, and UI state handling.

Jul 04, 2026·2 views

Frontend

Asteroid Collision (Tekion Frontend Interview) | Problem Solving Round

A classic stack-based problem asked in interviews at Tekion. You are given an array of integers where each value represents an asteroid’s direction and weight—positive moves left to right, negative moves right to left. When two asteroids collide, the heavier one survives. The goal is to determine which asteroids remain after all collisions are resolved.

Jul 04, 2026·4 views

Frontend

Designing a Calendar System (Google Calendar) in Frontend System Design

Calendar systems are complex UI applications used for scheduling, planning, and collaboration. Building something like Google Calendar involves handling time-based data, interactive UI (drag, resize), and synchronization with backend events. This problem tests your ability to manage complex state, design scalable UI components, and handle user interactions efficiently.

Jul 04, 2026·18 views

Frontend

Designing an Autocomplete / Search System in Frontend

Autocomplete is a widely used UI pattern seen in search bars, mentions, and suggestions across products. The goal is to fetch and display relevant suggestions as the user types, while ensuring performance, responsiveness, and correctness. This problem tests how you handle user input, API interaction, caching, and race conditions in real-time systems.

Jul 04, 2026·6 views

Frontend

Designing a Real-time Ride Tracking System (Uber-like) in Frontend System Design

Ride tracking systems display real-time locations of drivers and routes on a map. Applications like Uber rely heavily on frontend systems to efficiently render moving vehicles, update positions smoothly, and provide an interactive map experience. This problem tests your ability to handle real-time data, optimize rendering, and manage geospatial UI efficiently.

Jul 04, 2026·8 views

Frontend

Designing an Infinite Scroll Feed in Frontend System Design

Infinite scroll is one of the most common frontend system design problems asked in interviews and used in real products like feeds, search results, and marketplaces. The goal is to load data progressively as the user scrolls, while maintaining performance, responsiveness, and a smooth user experience. This problem tests how you think about data fetching, rendering, caching, and handling edge cases at scale.

Jul 04, 2026·8 views