CI/CD Pipeline Design: Fast, Safe, & Automated Delivery

Continuous Integration (CI) is the engineering practice of merging developer code updates frequently into a shared central branch (Trunk-Based Development), validating every commit with an automated build and test pipeline.

Core CI Pipeline Stages:

1. Fast Feedback Stage (< 2 minutes): Linting, formatting checks, and static type validation (e.g., TypeScript tsc --noEmit, Go golangci-lint).
2. Automated Test Stage (< 5 minutes): Unit tests with code coverage thresholds (> 80\%), and integration tests executed against ephemeral database containers using Testcontainers.
3. Static Application Security Testing (SAST): Scans source code for security flaws, hardcoded credentials, and SQL injection risks (e.g., SonarQube, Semgrep).
4. Dependency & Container Vulnerability Scanning: Scans npm/pip dependencies and base OS packages for known Common Vulnerabilities and Exposures (CVEs) using Trivy or Snyk.
5. Build, Tag, and Sign Artifacts: Builds immutable OCI container images using Multi-Stage Dockerfiles, tags them with immutable Git commit SHA digests (sha256:4f8a...), cryptographically signs them using Cosign (Sigstore), and pushes to a private container registry (AWS ECR / Google Artifact Registry).