Why I Stopped Writing Auth Code for Every Project and Built AuthShield

This is Part 1 of a 4-part series on building AuthShield - a production-ready standalone authentication microservice. This post is the origin story. No code, just the thinking. Every backend project I have built starts the same way. New repo. Fresh database. And then before writing a single line of product code, auth. Registration. Email verification. Login. JWT tokens. Password reset. OAuth. Roles. Sessions. The first time I built it, I learned a lot. I understood JWTs, token expiry, password hashing, OAuth flows. It was genuinely valuable. Then I started the next project. And built it again. Then the next one. And built it again. At some point I stopped and looked at what I was doing. Every project needs authentication. The requirements are almost identical across all of them. The security concerns are exactly the same. Yet I was treating it as a fresh problem every single time. That is not engineering. That is repetition. So I asked myself a simple question: why am I solving the sam