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Interview Gates

website·Indexed 30 days ago

https://interview-gates.vercel.app

A technical interview preparation resource covering system design, frontend development, and programming concepts. It includes detailed guides on designing large-scale systems like Uber, WhatsApp, and TinyURL, as well as practical implementations and theory for React JS, TypeScript, and JavaScript.

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310.5K
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735
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1.7K
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74%

What's inside Interview Gates

  1. Overview of Next.js and its core advantages

    Next.js is a React framework designed for production-ready applications. It provides several key advantages over standard React setups:

    • Hybrid Rendering: Supports both Server-Side Rendering (SSR) and Static Site Generation (SSG).
    • Automatic Code Splitting: Loads only the JavaScript necessary for the current page, reducing bundle size.
    • File-based Routing: Routes are automatically created based on the file structure in the pages directory.
    • API Routes: Enables full-stack development by allowing API endpoints within the same application.
    • Optimized Performance: Includes built-in Image and Font optimization and automatic static optimization.
    • Styling Support: Native support for global CSS and CSS Modules.

  2. Overview of Express.js and its advantages

    Express.js is a minimal and flexible Node.js web application framework used to build web and mobile applications. It provides a powerful API for handling HTTP requests, responses, routing, and middleware. Key advantages include simplified routing, built-in middleware support, high extensibility, flexibility in application structure, and a large ecosystem of plugins.

  3. Overview of Modern Networking Trends

    Current technological shifts in networking include:

    • SDN (Software-Defined Networking): Separates the control plane (decision making) from the data plane (forwarding) to allow for programmable, flexible network management.
    • IoT (Internet of Things): A network of interconnected physical devices that collect and exchange data over the internet.
    • 5G: The fifth generation of mobile networks, offering significantly higher speeds and lower latency than previous generations.

  4. Overview of Campaign Management System Architecture

    The system is designed for daily batch processing rather than real-time updates, refreshing campaign data once per day in the morning. It integrates with Yandex Direct, Google Ads, Meta, VK, and MyTarget APIs to fetch campaign and targeting data, execute predefined optimization rules, and archive historical data for analysis.

  5. Overview of built-in React Hooks

    React provides several built-in hooks categorized into Basic and Additional hooks to manage state, side effects, and performance optimizations in functional components.
    // Basic Hooks
useState(): Set and retrieve state.
useEffect(): Perform side effects.
useContext(): Access context data without prop drilling.

// Additional Hooks
useReducer(): Manage complex state logic or state dependent on previous state.
useMemo(): Memoize expensive calculations to avoid re-computing on every render.
useCallback(): Memoize callbacks to prevent unnecessary re-renders of optimized child components.
useRef(): Create a direct reference to a DOM element.
useLayoutEffect(): Read layout from the DOM and re-render synchronously.
useImperativeHandle(): Modify the instance passed via a ref object.
useDebugValue(): Display a label for custom hooks in React DevTools.

  6. Overview of Quora System Design Goals

    Quora is a social question-and-answer service designed to provide deeper, conversational insights compared to traditional search engines. The system design focuses on allowing any user to ask and answer questions, leveraging subject matter experts for high-quality content. The design process is divided into four phases: defining functional and non-functional requirements, creating an initial API and block design, refining the design to handle constraints (including vertical database sharding), and evaluating the final architecture against non-functional requirements and availability.

  7. Overview of technical interview preparation categories

    The interview preparation guide is organized into several key areas to help developers prepare for technical interviews:

    • Theory: Over 150 questions on key concepts.
    • Practice: More than 50 practical coding tasks.
    • Algorithms: Explanations of over 20 algorithmic patterns.
    • System Design: Essential topics for large-scale system design interviews.

  8. Overview of File Transfer Protocol (FTP)

    FTP (File Transfer Protocol) is a network protocol used to transfer files between a client and a server. It is primarily used for uploading and downloading files to a server, as well as managing files (creating, deleting, or modifying them).

  9. Use React Router for single-page application navigation

    React Router is the standard library for routing in React, allowing navigation without page refreshes and keeping the UI in sync with the browser URL.
    // Key Components:
// <BrowserRouter>: Parent component using HTML5 history API to sync UI and URL.
// <Routes>: Container for route definitions (introduced in v6).
// <Route>: Conditionally renders UI when the path matches the current URL.
// <Link>: Creates navigation links (similar to <a> tags).

  10. Design a Rate Limiter using standard system building blocks

    A robust rate limiter architecture typically integrates the following components:

    • Databases: Store service provider rules and user metadata.
    • Caches: Store frequently accessed rules and user data to reduce latency.
    • Queues: Hold incoming requests that have been approved by the rate limiter for deferred processing.

  11. Design a scalable and fault-tolerant authentication architecture

    A robust authentication system should utilize the following architectural components:

    • API Gateway & Load Balancing: Use tools like AWS API Gateway, NGINX, or AWS ELB to route traffic and distribute load across service instances.
    • Microservices: Split the system into discrete services (e.g., Auth Service, 2FA Service, Protected API) to simplify independent scaling.
    • Decentralization & Caching: Use distributed databases (e.g., AWS RDS, PostgreSQL) for user and session data, and implement a caching layer using Redis or Memcached to reduce database load for JWT and session lookups.
    • High Availability: Implement Multi-AZ deployments and automatic failover to standby instances to ensure system uptime.

  12. Classify client requests by resource bottleneck

    Client requests are categorized based on the primary resource that limits their execution speed. This classification helps in identifying the system bottleneck during capacity planning.