--- title: System Design was HARD until I Learned these 30 Concepts description: To advance from a junior developer to a senior engineer or secure a high-paying job at a big tech company, mastering system design is crucial. Understanding... canonical: https://daily.dev/posts/system-design-was-hard-until-i-learned-these-30-concepts-kwtongggd twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: System Design was HARD until I Learned these 30 Concepts | daily.dev og:description: To advance from a junior developer to a senior engineer or secure a high-paying job at a big tech company, mastering system design is crucial. Understanding... og:url: https://daily.dev/posts/system-design-was-hard-until-i-learned-these-30-concepts-kwtongggd og:image: https://api.daily.dev/og/posts/KwToNGGGd.png og:image:alt: System Design was HARD until I Learned these 30 Concepts og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # System Design was HARD until I Learned these 30 Concepts **[YouTube](https://daily.dev/sources/youtube)** · 20 min read · 415 upvotes · 12 comments ## Summary To advance from a junior developer to a senior engineer or secure a high-paying job at a big tech company, mastering system design is crucial. Understanding core concepts like client-server architecture, DNS, HTTP, APIs (REST and GraphQL), databases (SQL and NoSQL), and scaling techniques (vertical and horizontal scaling, caching, and load balancing) are fundamental. The post outlines these critical concepts and offers real-world examples to help in designing scalable, reliable systems. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Community discussion Top comments from developers on daily.dev. **@humster** · 2 upvotes > 30 things? > Its like saying backend engineering was hard until i learnt all about backend engineering **@mohsinraza** · 1 upvotes > Johnny Lever **@ktreharrison** · 0 upvotes > Great video! **@megacy777** · 0 upvotes > Namaste **@salsera** · 0 upvotes > Great video!! --- Tags: [#webdev](https://daily.dev/tags/webdev), [#cloud](https://daily.dev/tags/cloud), [#career](https://daily.dev/tags/career) [View this post on daily.dev](https://daily.dev/posts/system-design-was-hard-until-i-learned-these-30-concepts-kwtongggd) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"System Design was HARD until I Learned these 30 Concepts","url":"https://daily.dev/posts/system-design-was-hard-until-i-learned-these-30-concepts-kwtongggd","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/system-design-was-hard-until-i-learned-these-30-concepts-kwtongggd"},"datePublished":"2025-04-02T06:13:54.328Z","dateModified":"2025-04-02T06:14:37.759Z","description":"To advance from a junior developer to a senior engineer or secure a high-paying job at a big tech company, mastering system design is crucial. 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