Built a production medical SaaS where doctors upload DICOM scans, view them in a full browser-based viewer, and share them via a secure tokenized link — no software needed for the recipient. Features: Cornerstone3D viewer with window/level, zoom, pan, cine loop, and side-by-side comparison. Three subscription tiers via Stripe. Role-based access (Admin/Doctor/Radiologist/Staff). 127 automated tests, GitHub Actions CI/CD, Sentry error monitoring, and audit logging for compliance.