The 80% every SaaS rebuilds — done right
Synexa is a production-grade Next.js, Firebase, and Stripe foundation. Auth, billing, usage quotas, account deletion, and security are already built and tested — so day one goes to your product, not its plumbing.
Why Synexa Exists
Every SaaS starts the same way: weeks of wiring up authentication, subscriptions, usage limits, an admin panel, and the security to hold it all together — before a single line of the actual product gets written.
And this layer is deceptively hard. Getting it wrong means double-charged customers, subscriptions that quietly drift out of sync with Stripe, half-deleted accounts, or a role field a user can flip to “admin.” Those bugs are quiet, expensive, and usually found in production.
Synexa is that layer, done properly. The Stripe webhook is the single source of truth for billing, sessions are revocation-aware, account deletion is durable and resumable, and entitlements can only ever be written on the server. Clone it, add your keys, and build the part only you can build.
— The Synexa Team
The engineers behind Synexa
What you're standing on
Rebuilding the same foundation is slow and expensive. Synexa gives you a production-grade starting point so you can move straight to what makes your product different.
Correct under failure
The failure modes that bite real SaaS apps — duplicate webhooks, out-of-order events, a checkout that races an account deletion — are handled, not hoped away.
Secure by default
Server-only entitlements, revocation-aware sessions, CSRF protection on cookie-backed mutations, tested Firestore rules, rate limiting, and hardened response headers — shipped on, not left as a TODO.
Clean and maintainable
A logical, strictly-typed structure with feature flags and config as the single source of truth. You'll always know where your code lives and how to extend it.
Proven, not just claimed
300+ unit tests, end-to-end coverage of the critical flows, and documented internals for every subsystem. Read the code before you trust it.
The idea
“You shouldn't have to rebuild authentication, billing, and account lifecycle every time you have a new idea. Get the undifferentiated 80% for free — correct from the start — and spend your time on the 20% that's actually your product.”
Stop rebuilding from scratch.
Start from a foundation that already handles the hard parts, and get to your first real feature today.