> ## Documentation Index
> Fetch the complete documentation index at: https://mintlify.com/donnemartin/system-design-primer/llms.txt
> Use this file to discover all available pages before exploring further.

# System Design Primer

> Learn how to design large-scale systems and ace your system design interviews

<div className="relative overflow-hidden bg-gradient-to-br from-[#7cbce4] via-[#5eaad9] to-[#4a9bc9] dark:from-[#1a1d27] dark:via-[#242838] dark:to-[#1a1d27] py-20">
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  <div className="relative max-w-6xl mx-auto px-6 text-center">
    <h1 className="text-5xl sm:text-6xl lg:text-7xl font-bold text-white dark:text-gray-100 mb-6">
      System Design Primer
    </h1>

    <p className="text-xl sm:text-2xl text-white/90 dark:text-gray-300 max-w-3xl mx-auto mb-10">
      Master large-scale system design principles and ace your technical interviews with comprehensive guides, real-world solutions, and hands-on examples.
    </p>

    <div className="flex flex-wrap justify-center gap-4">
      <a href="/introduction" className="inline-flex items-center px-8 py-3.5 bg-white dark:bg-[#242838] text-[#7cbce4] dark:text-white font-semibold rounded-full hover:bg-gray-50 dark:hover:bg-[#2d3244] transition-colors no-underline shadow-lg">
        Get Started

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      </a>

      <a href="/interview/approach" className="inline-flex items-center px-8 py-3.5 bg-white/10 dark:bg-white/5 text-white dark:text-gray-100 font-semibold rounded-full border border-white/30 dark:border-gray-600 hover:bg-white/20 dark:hover:bg-white/10 transition-colors no-underline backdrop-blur-sm">
        Interview Guide
      </a>
    </div>
  </div>
</div>

<div className="mt-16 mb-16 max-w-5xl mx-auto px-6">
  <h2 className="text-3xl font-bold text-gray-900 dark:text-white mb-4">Quick start</h2>
  <p className="text-base text-gray-600 dark:text-gray-400 mb-8">Get up to speed with system design fundamentals in minutes</p>

  <Steps>
    <Step title="Understand the fundamentals">
      Start with core concepts like performance vs scalability, latency vs throughput, and the CAP theorem. These trade-offs are fundamental to every system design decision.

      <CardGroup cols={2}>
        <Card title="Performance vs Scalability" icon="gauge-high" href="/topics/performance-vs-scalability">
          Learn when to optimize for speed versus scale
        </Card>

        <Card title="Availability vs Consistency" icon="scale-balanced" href="/topics/availability-vs-consistency">
          Understand the CAP theorem and its implications
        </Card>
      </CardGroup>
    </Step>

    <Step title="Learn core components">
      Master the building blocks of distributed systems: load balancers, caches, databases, CDNs, and message queues.

      <Note>
        Every large-scale system is built from these fundamental components. Understanding how they work individually and together is crucial.
      </Note>
    </Step>

    <Step title="Practice with real problems">
      Work through actual system design interview questions with detailed solutions, diagrams, and code examples.

      ```text Example Problems theme={null}
      • Design Pastebin/Bit.ly - URL shortening service
      • Design Twitter - Timeline and search functionality  
      • Design a Web Crawler - Distributed web indexing
      • Design Mint.com - Personal finance aggregator
      ```
    </Step>

    <Step title="Use Anki flashcards for retention">
      Download our spaced repetition flashcard decks to reinforce your learning and retain key concepts for interviews.

      <a href="/anki-flashcards" className="inline-flex items-center text-[#7cbce4] dark:text-[#b2d6ef] hover:underline font-medium">
        Get the flashcard decks

        <svg className="ml-1 w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
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        </svg>
      </a>
    </Step>
  </Steps>
</div>

<div className="mt-16 mb-16 max-w-5xl mx-auto px-6">
  <h2 className="text-3xl font-bold text-gray-900 dark:text-white mb-4">Explore by topic</h2>
  <p className="text-base text-gray-600 dark:text-gray-400 mb-8">Deep dive into specific areas of system design</p>

  <CardGroup cols={3}>
    <Card title="DNS" icon="globe" href="/components/dns">
      Domain name system and hierarchical resolution
    </Card>

    <Card title="CDN" icon="network-wired" href="/components/cdn">
      Content delivery networks and edge caching
    </Card>

    <Card title="Load Balancer" icon="scale-balanced" href="/components/load-balancer">
      Distribute traffic across multiple servers
    </Card>

    <Card title="Reverse Proxy" icon="arrow-right-arrow-left" href="/components/reverse-proxy">
      Centralize services and add security
    </Card>

    <Card title="Database" icon="database" href="/components/database">
      RDBMS, NoSQL, replication, and sharding
    </Card>

    <Card title="Cache" icon="bolt" href="/components/cache">
      In-memory data stores and caching strategies
    </Card>

    <Card title="Asynchronism" icon="clock" href="/components/asynchronism">
      Message queues and task queues
    </Card>

    <Card title="Communication" icon="comments" href="/components/communication">
      TCP, UDP, RPC, and REST protocols
    </Card>

    <Card title="Security" icon="shield-halved" href="/components/security">
      Encryption, authentication, and authorization
    </Card>
  </CardGroup>
</div>

<div className="mt-16 mb-16 max-w-5xl mx-auto px-6">
  <h2 className="text-3xl font-bold text-gray-900 dark:text-white mb-4">Interview preparation</h2>
  <p className="text-base text-gray-600 dark:text-gray-400 mb-8">Real system design interview problems with complete solutions</p>

  <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
    <a href="/solutions/pastebin" className="group block rounded-2xl border border-gray-200 dark:border-[#27272a] hover:border-[#7cbce4] dark:hover:border-[#7cbce4] overflow-hidden no-underline transition-colors bg-white dark:bg-[#1a1d27]">
      <div className="p-6">
        <div className="flex items-start justify-between mb-3">
          <div className="p-2 bg-[#7cbce4]/10 dark:bg-[#7cbce4]/20 rounded-lg">
            <svg className="w-6 h-6 text-[#7cbce4]" fill="none" stroke="currentColor" viewBox="0 0 24 24">
              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M13.828 10.172a4 4 0 00-5.656 0l-4 4a4 4 0 105.656 5.656l1.102-1.101m-.758-4.899a4 4 0 005.656 0l4-4a4 4 0 00-5.656-5.656l-1.1 1.1" />
            </svg>
          </div>
        </div>

        <h3 className="text-lg font-semibold text-gray-900 dark:text-white mb-2 group-hover:text-[#7cbce4] dark:group-hover:text-[#b2d6ef] transition-colors">Design Pastebin</h3>
        <p className="text-sm text-gray-600 dark:text-gray-400 mb-3">Design a URL shortening service like Bit.ly with hash generation, storage, and redirection at scale.</p>

        <div className="flex items-center text-[#7cbce4] dark:text-[#b2d6ef] text-sm font-medium">
          View solution

          <svg className="ml-1 w-4 h-4 group-hover:translate-x-1 transition-transform" fill="none" stroke="currentColor" viewBox="0 0 24 24">
            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M9 5l7 7-7 7" />
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      </div>
    </a>

    <a href="/solutions/twitter" className="group block rounded-2xl border border-gray-200 dark:border-[#27272a] hover:border-[#7cbce4] dark:hover:border-[#7cbce4] overflow-hidden no-underline transition-colors bg-white dark:bg-[#1a1d27]">
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              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M8 12h.01M12 12h.01M16 12h.01M21 12c0 4.418-4.03 8-9 8a9.863 9.863 0 01-4.255-.949L3 20l1.395-3.72C3.512 15.042 3 13.574 3 12c0-4.418 4.03-8 9-8s9 3.582 9 8z" />
            </svg>
          </div>
        </div>

        <h3 className="text-lg font-semibold text-gray-900 dark:text-white mb-2 group-hover:text-[#7cbce4] dark:group-hover:text-[#b2d6ef] transition-colors">Design Twitter</h3>
        <p className="text-sm text-gray-600 dark:text-gray-400 mb-3">Build a social media timeline and search system with fan-out strategies and real-time updates.</p>

        <div className="flex items-center text-[#7cbce4] dark:text-[#b2d6ef] text-sm font-medium">
          View solution

          <svg className="ml-1 w-4 h-4 group-hover:translate-x-1 transition-transform" fill="none" stroke="currentColor" viewBox="0 0 24 24">
            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M9 5l7 7-7 7" />
          </svg>
        </div>
      </div>
    </a>

    <a href="/solutions/web-crawler" className="group block rounded-2xl border border-gray-200 dark:border-[#27272a] hover:border-[#7cbce4] dark:hover:border-[#7cbce4] overflow-hidden no-underline transition-colors bg-white dark:bg-[#1a1d27]">
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        <div className="flex items-start justify-between mb-3">
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            <svg className="w-6 h-6 text-[#7cbce4]" fill="none" stroke="currentColor" viewBox="0 0 24 24">
              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0z" />
            </svg>
          </div>
        </div>

        <h3 className="text-lg font-semibold text-gray-900 dark:text-white mb-2 group-hover:text-[#7cbce4] dark:group-hover:text-[#b2d6ef] transition-colors">Design a Web Crawler</h3>
        <p className="text-sm text-gray-600 dark:text-gray-400 mb-3">Create a distributed web crawler that indexes billions of pages efficiently with politeness policies.</p>

        <div className="flex items-center text-[#7cbce4] dark:text-[#b2d6ef] text-sm font-medium">
          View solution

          <svg className="ml-1 w-4 h-4 group-hover:translate-x-1 transition-transform" fill="none" stroke="currentColor" viewBox="0 0 24 24">
            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M9 5l7 7-7 7" />
          </svg>
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      </div>
    </a>

    <a href="/solutions/scaling-aws" className="group block rounded-2xl border border-gray-200 dark:border-[#27272a] hover:border-[#7cbce4] dark:hover:border-[#7cbce4] overflow-hidden no-underline transition-colors bg-white dark:bg-[#1a1d27]">
      <div className="p-6">
        <div className="flex items-start justify-between mb-3">
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            <svg className="w-6 h-6 text-[#7cbce4]" fill="none" stroke="currentColor" viewBox="0 0 24 24">
              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M3 15a4 4 0 004 4h9a5 5 0 10-.1-9.999 5.002 5.002 0 10-9.78 2.096A4.001 4.001 0 003 15z" />
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        </div>

        <h3 className="text-lg font-semibold text-gray-900 dark:text-white mb-2 group-hover:text-[#7cbce4] dark:group-hover:text-[#b2d6ef] transition-colors">Scale to Millions on AWS</h3>
        <p className="text-sm text-gray-600 dark:text-gray-400 mb-3">Learn how to scale a system from one user to millions using AWS services and best practices.</p>

        <div className="flex items-center text-[#7cbce4] dark:text-[#b2d6ef] text-sm font-medium">
          View solution

          <svg className="ml-1 w-4 h-4 group-hover:translate-x-1 transition-transform" fill="none" stroke="currentColor" viewBox="0 0 24 24">
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    </a>
  </div>

  <div className="mt-8 text-center">
    <a href="/solutions/pastebin" className="inline-flex items-center text-[#7cbce4] dark:text-[#b2d6ef] hover:underline font-medium">
      View all 8 system design problems

      <svg className="ml-1 w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
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<div className="mt-16 mb-16 max-w-5xl mx-auto px-6">
  <h2 className="text-3xl font-bold text-gray-900 dark:text-white mb-4">Additional resources</h2>
  <p className="text-base text-gray-600 dark:text-gray-400 mb-8">Reference materials and real-world examples</p>

  <CardGroup cols={2}>
    <Card title="Powers of Two Table" icon="calculator" href="/reference/powers-of-two">
      Essential memory and storage calculations
    </Card>

    <Card title="Latency Numbers" icon="stopwatch" href="/reference/latency-numbers">
      Performance benchmarks every programmer should know
    </Card>

    <Card title="Real-World Architectures" icon="building" href="/reference/real-world-architectures">
      Case studies from production systems
    </Card>

    <Card title="Company Engineering Blogs" icon="newspaper" href="/reference/company-blogs">
      Learn from tech companies' engineering blogs
    </Card>
  </CardGroup>
</div>

<div className="mt-20 mb-16 max-w-5xl mx-auto px-6">
  <div className="rounded-3xl bg-gradient-to-r from-[#7cbce4] to-[#5eaad9] dark:from-[#242838] dark:to-[#1a1d27] p-12 text-center border dark:border-[#27272a]">
    <h2 className="text-3xl font-bold text-white dark:text-gray-100 mb-4">Ready to master system design?</h2>

    <p className="text-lg text-white/90 dark:text-gray-300 mb-8 max-w-2xl mx-auto">
      Start learning today with our comprehensive guides, real interview problems, and hands-on examples.
    </p>

    <a href="/introduction" className="inline-flex items-center px-8 py-3.5 bg-white dark:bg-[#7cbce4] text-[#7cbce4] dark:text-white font-semibold rounded-full hover:bg-gray-50 dark:hover:bg-[#6bb4dc] transition-colors no-underline shadow-lg">
      Start Learning

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