Beyond Login: Building a Production Authentication Lifecycle in FastAPI

<blockquote> <p><em>JWT tutorials only teach the easy part. Here's what happens after.</em></p> </blockquote> <p>Most auth tutorials end at "user logs in, gets a token, done." And

<p>A member and a staff coordinator can belong to the same organization, use the same login system, and need very different access. That difference becomes easy to lose when a

<p>Short answer: use an emailed, single-use reset link as the default for most SaaS login recovery, and add SMS OTP only where users may genuinely lack email access or the product

<blockquote> <p>This article describes an anonymized enterprise implementation. Company names, internal domains, repository identifiers, ticket numbers, and proprietary control

<h2> Introduction </h2> <p>In modern application development, securing user authentication is a foundational requirement. As systems scale and threats become more sophisticated,

<p>If you're building an MCP server, sooner or later someone is going to ask: how does authentication work?</p> <p>The MCP spec leaves this open. Most early servers shipped with

<p>You typed the code. You're sure you typed it right. The site says "Invalid or expired code." You request a new one. Same thing.</p> <p>OTP failures are one of the most

<h2> The Next Step </h2> <p>In <a href="https://dev.to/writing/building-an-authentication-service/">Extracting Authentication to a Microservice</a>, I described building a