--- title: How LinkedIn Authorizes 10 Million API Calls Per Second description: LinkedIn utilizes Access Control Lists (ACLs) to manage access control at scale, facing challenges such as quick authorization checks, prompt ACL changes... canonical: https://daily.dev/posts/how-linkedin-authorizes-10-million-api-calls-per-second-qccaxvvwq twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: How LinkedIn Authorizes 10 Million API Calls Per Second | daily.dev og:description: LinkedIn utilizes Access Control Lists (ACLs) to manage access control at scale, facing challenges such as quick authorization checks, prompt ACL changes... og:url: https://daily.dev/posts/how-linkedin-authorizes-10-million-api-calls-per-second-qccaxvvwq og:image: https://api.daily.dev/og/posts/QCcaxVVWq.png og:image:alt: How LinkedIn Authorizes 10 Million API Calls Per Second 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. # How LinkedIn Authorizes 10 Million API Calls Per Second **[System Design Codex](https://daily.dev/sources/systemdesigncodex)** · 3 min read · 235 upvotes · 2 comments ## Summary LinkedIn utilizes Access Control Lists (ACLs) to manage access control at scale, facing challenges such as quick authorization checks, prompt ACL changes delivery, managing a large number of ACLs, and monitoring ACL data. They handle these challenges by running an authorization client module on every service, periodically refreshing ACL data, storing ACLs in a database with a cache, and logging authorization checks for monitoring purposes. ## 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. **@syedkhalid076** · 1 upvotes > 🔥🔥 **@leekhitame** · 1 upvotes > need to read this --- Tags: [#security](https://daily.dev/tags/security), [#microservices](https://daily.dev/tags/microservices), [#authorization](https://daily.dev/tags/authorization), [#linkedin](https://daily.dev/tags/linkedin) [View this post on daily.dev](https://daily.dev/posts/how-linkedin-authorizes-10-million-api-calls-per-second-qccaxvvwq) ```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":"How LinkedIn Authorizes 10 Million API Calls Per Second","url":"https://daily.dev/posts/how-linkedin-authorizes-10-million-api-calls-per-second-qccaxvvwq","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/how-linkedin-authorizes-10-million-api-calls-per-second-qccaxvvwq"},"datePublished":"2024-05-14T08:45:27.567Z","dateModified":"2024-05-14T08:45:27.265Z","description":"LinkedIn utilizes Access Control Lists (ACLs) to manage access control at scale, facing challenges such as quick authorization checks, prompt ACL changes...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/571a7feecd3aeae43c80ce8d3128dfcc?_a=AQAEuiZ","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/571a7feecd3aeae43c80ce8d3128dfcc?_a=AQAEuiZ","isAccessibleForFree":true,"articleSection":"System Design Codex","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"System Design Codex","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/0df89304c19443509ec91a6ccb707853","url":"https://daily.dev/sources/systemdesigncodex"},"commentCount":2,"discussionUrl":"https://daily.dev/posts/how-linkedin-authorizes-10-million-api-calls-per-second-qccaxvvwq","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":235},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":2}],"keywords":"security,microservices,authorization,linkedin","timeRequired":"PT3M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"System Design Codex","item":"https://daily.dev/sources/systemdesigncodex"},{"@type":"ListItem","position":3,"name":"How LinkedIn Authorizes 10 Million API Calls Per Second"}]} {"@context":"https://schema.org","@type":"WebPage","@id":"https://daily.dev/posts/how-linkedin-authorizes-10-million-api-calls-per-second-qccaxvvwq","comment":[{"@type":"Comment","text":"🔥🔥","datePublished":"2024-05-21T08:43:03.614Z","url":"https://daily.dev/posts/QCcaxVVWq#c-ykGL9rxi8","author":{"@type":"Person","name":"Syed Khalid Hussain","url":"https://daily.dev/syedkhalid076","image":"https://media.daily.dev/image/upload/s--RbxN21Sn--/f_auto/v1716446626/avatars/avatar_tmu7qCuOREyUCIcwMWaUS"},"interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":1}},{"@type":"Comment","text":"need to read this","datePublished":"2024-07-31T04:21:17.853Z","url":"https://daily.dev/posts/QCcaxVVWq#c-noU465iBN","author":{"@type":"Person","name":"Likhita Magar","url":"https://daily.dev/leekhitame","image":"https://lh3.googleusercontent.com/a/ACg8ocJJV226h4wLqC3RcvNTHQsKUqbOGk76QxsusKdp-IKufL3m=s96-c"},"interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":1}}]} ```