I am standing up the very first live release of a healthcare-insurance claims platform and I need a full-stack product engineer who has already shipped SaaS dashboards on GCP/Firebase. Phase-one focus The heart of this milestone is the contributor portal. Contributors must be able to open a browser, authenticate, submit a claim with medical-service details and receipts, upload PDFs securely, and then track the claim’s status in real time. Every action must persist to Firestore and trigger the appropriate workflow rules so an admin can pick it up immediately. Core workflow 1. Contributor authenticates (Firebase Auth) 2. Completes an adaptive form that collects medical-service details and receipt images/PDFs 3. Files are streamed to Cloud Storage through a signed-URL flow; duplicate-file detection runs in a Cloud Function before final write 4. Claim record lands in Firestore, fires a pub/sub event that pushes it into an Admin Review dashboard (Material-UI / React preferred) 5. Status updates propagate back to the contributor’s timeline instantly via real-time listeners Security expectations • All uploads scanned and stored with unique, expiring URLs • End-to-end HTTPS, IAM-based access, and Firebase Security Rules covering both Firestore and Storage buckets • Audit trail on every write, edit, and view Stretch components I would like stubbed in (not fully built yet) • Admin dashboard views for triage, validation, and payment approval • Insurer knowledge base section fed from Firestore docs Acceptance criteria for this milestone • React/Next.js front end talking to Firebase via the modular v9 SDK • Firestore data model diagram delivered in Draw.io or similar • Infrastructure set up in my GCP project using Terraform or the Firebase CLI with clear README steps • Lighthouse score ≥ 90 on performance and best-practice audits • Unit tests on all Cloud Functions; portal component tests in Jest/React-Testing-Library • Deployed to Firebase Hosting behind my custom domain If you have shipped comparable portals that handle sensitive documents and real-time dashboards, I’d love to move quickly. Please include a short note about a similar Firebase or GCP project you’ve led and the hard lessons you learned along the way.