---
title: "How LinkedIn Authorizes 10 Million API Calls Per Second"
url: https://daily.dev/posts/how-linkedin-authorizes-10-million-api-calls-per-second-qccaxvvwq
source_url: https://newsletter.systemdesigncodex.com/p/how-linkedin-authorizes-10-million
type: article
source: "System Design Codex"
published: 2024-05-14T08:45:27.567Z
updated: 2024-05-14T08:45:27.265Z
tags: ["security", "microservices", "authorization", "linkedin"]
reading_time: 3
upvotes: 236
comments: 2
language: en
---

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# How LinkedIn Authorizes 10 Million API Calls Per Second

**[System Design Codex](https://daily.dev/sources/systemdesigncodex)** · 3 min read · 236 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: <https://newsletter.systemdesigncodex.com/p/how-linkedin-authorizes-10-million>

## Community discussion

Top comments from developers on daily.dev.

**@syedkhalid076** · 1 upvotes

> 🔥🔥

**@leekhitame** · 1 upvotes

> need to read this

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---

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)