# 🚀 I Built a Jenkins CI/CD Pipeline From Scratch — Here's Every Bug I Hit (and How I Fixed Them)

A learning-in-public story about Flask, Jenkins, AWS EC2, systemd, and finally shipping a live demo on Vercel.

I built PyPulse, a tiny Flask app, and wired it up to a full CI/CD pipeline: push to GitHub → Jenkins builds → tests → deploys to AWS EC2 → auto-triggered via webhook → managed by systemd. Along the way I broke almost every piece of it at least once, and fixed each one. I also deployed a permanent live demo on Vercel, since my EC2 instance is running on the AWS free trial and won't live forever.

If you're learning DevOps and want to see what the real, messy version of "just set up a CI/CD pipeline" looks like — not the polished tutorial version — this is that.

Piece Tool Job

App Flask + pytest + gunicorn The actual web app and its tests