U.S.-Based React/Firebase SaaS Technical Lead / Architecture Reviewer

We are looking for a U.S.-based senior React/Firebase technical lead or software architect to help review and guide an existing SaaS product to pilot launch.

The product is already built and deployed in staging. This is not a greenfield build. We need an experienced technical partner who can inspect the current architecture, review contractor work, identify launch risks, and help sequence the remaining work before pilot.

Current stack:

* React / TypeScript

* Firebase Auth

* Firestore

* Firebase Storage

* Firebase Cloud Functions

* Firebase Hosting / GCP

* GitHub

The app is a multi-tenant SaaS platform with organizations, locations, employees, role-based permissions, training modules, SOPs, communications, request-off workflows, handbook acknowledgements, and admin consoles.

We need help with:

* Reviewing the existing React/Firebase architecture

* Reviewing Firestore rules, Storage rules, Cloud Functions, auth/custom claims, and tenant isolation

* Reviewing PRs and contractor work

* Advising on remaining pilot-readiness work

* Helping sequence frontend cleanup, UX/UI polish, admin console structure, and final security review

* Identifying risks before real pilot customers are onboarded

Important experience:

* React + TypeScript SaaS applications

* Firebase Auth / Firestore / Cloud Functions

* Multi-tenant architecture

* Role-based access control

* Security-minded code review

* GitHub branch / PR workflow

* Ability to explain technical tradeoffs clearly

We would like to start with a small paid technical review first. If it is a good fit, this may turn into an ongoing technical lead/advisor role.

We are not looking for someone to blindly rebuild the app. We need senior judgment, architecture review, launch-risk identification, and practical guidance.