--- title: Best System Design Codex posts — September 2025 | daily.dev description: The most upvoted System Design Codex posts from September 2025, curated by the daily.dev community. canonical: https://daily.dev/sources/systemdesigncodex/best-of/2025/09 twitter:card: summary_large_image twitter:site: @dailydotdev og:url: https://daily.dev/sources/systemdesigncodex/best-of/2025/09 og:type: website og:site_name: daily.dev og:title: Best System Design Codex posts — September 2025 | daily.dev og:description: The most upvoted System Design Codex posts from September 2025, curated by the daily.dev community. og:image: https://media.daily.dev/image/upload/s--VAY5ToZt--/f_auto/v1724209435/public/daily.dev%20-%20open%20graph --- # Best of System Design Codex — September 2025 1. 1 [](https://daily.dev/posts/most-important-tips-for-system-design-interviews-2bviopxw7 "Most Important Tips for System Design Interviews") Article System Design Codex · 52w Most Important Tips for System Design Interviews A comprehensive guide covering 23 essential principles for system design interviews, including scaling strategies (vertical then horizontal), caching for read-heavy systems, database optimization techniques, load balancing, and architectural patterns. Emphasizes the importance of clarifying requirements, considering trade-offs, and maintaining interactive communication during interviews rather than seeking perfect solutions. 77 [See all System Design Codex archives](/sources/systemdesigncodex/best-of) ```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","@graph":[{"@type":"CollectionPage","@id":"https://daily.dev/sources/systemdesigncodex/best-of/2025/09#page","url":"https://daily.dev/sources/systemdesigncodex/best-of/2025/09","name":"Best System Design Codex Posts — September 2025","description":"The most upvoted System Design Codex posts from September 2025, curated by the daily.dev community.","isPartOf":{"@type":"WebSite","url":"https://daily.dev"}},{"@type":"ItemList","@id":"https://daily.dev/sources/systemdesigncodex/best-of/2025/09#items","numberOfItems":1,"itemListElement":[{"@type":"ListItem","position":1,"url":"https://daily.dev/posts/most-important-tips-for-system-design-interviews-2bviopxw7","name":"Most Important Tips for System Design Interviews"}]},{"@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Sources","item":"https://daily.dev/sources"},{"@type":"ListItem","position":3,"name":"System Design Codex","item":"https://daily.dev/sources/systemdesigncodex"},{"@type":"ListItem","position":4,"name":"Best of","item":"https://daily.dev/sources/systemdesigncodex/best-of"},{"@type":"ListItem","position":5,"name":"September 2025"}]}]} ```