SwiftDeploy: How I Built a Tool That Writes Its Own Infrastructure Files

Introduction As part of the HNG Internship Stage 4 DevOps track, I built SwiftDeploy — a declarative deployment CLI tool that generates Nginx and Docker Compose configurations from a single manifest.yaml file. In Stage 4B, I extended it with Prometheus metrics, Open Policy Agent (OPA) policy enforcement, a live status dashboard, and an audit trail. This post walks through the entire journey — the design decisions, the guardrails, the chaos, and the lessons learned. The Design: A Tool That Writes