How to Send Auth Codes via WhatsApp in Your App With Kinde
Your users are in San Francisco, Jakarta, São Paulo, and Sydney. They have WhatsApp open all day. They check it before they check their SMS inbox. Whe…
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Authorization at Scale: Access Levels, Roles, and Compact Decisions
Authentication answers "who are you?" Authorization answers the harder question: "are you allowed to do this?" By the time a request reaches this stag…
Multi-tenant auth and routing in Kubernetes
In the first four chapters of this series I've talked about what the Auth Gateway decides. This chapter is about who it decides for. We run a multi-te…
Endpoint classification: OPEN, AUTHENTICATED, ACCESS_CONTROLLED
In Chapter 3 the controller branched on something called the "endpoint type": switch endpointType ( perms ) { case "OPEN" : ... case "AUTHENTICATED" :…
Inside the Auth Service: From Token Validator to Policy Decision Point
Most auth services start simple — verify the token, return 200 or 401. Then requirements accumulate. Tenant isolation. Service accounts. Token revocat…
Why we built an Auth Gateway instead of putting auth in every service
If you've been on a platform team long enough, you've probably watched this slow-motion failure: You ship an auth library. Three services adopt it. Si…
NGINX auth_request: the small primitive that changed everything
In Chapter 1 I claimed our entire Auth Gateway is built on top of one NGINX directive: auth_request . This chapter is a deep dive into how that direct…