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DefiningSystem

waking the core

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From idea to first invoice, without the eighteen-month plan.

We build SaaS platforms end to end — the multi-tenancy, the billing, the permissioning, the admin tooling — the unglamorous 70% that determines whether a product can actually take money from strangers. You bring the domain; we bring the platform.

multi-tenantbillingRBAC
what's in it

What we build, concretely.

Multi-tenancy designed up front

Tenant isolation chosen deliberately — shared schema with row-level security, schema-per-tenant, or database-per-tenant — and written down before the first migration.

Billing that survives edge cases

Stripe subscriptions, metered usage, proration, dunning, and invoices that reconcile with what the bank says.

RBAC that is actually enforced

Roles and permissions checked at the data layer, not just hidden in the UI. Admins cannot do what admins should not.

Auth without the adventure

Password, magic-link, and OAuth flows that handle invitations, offboarding, and session revocation without drama.

Admin & observability

Back-office tooling for your support team and an audit log for everything that matters.

Usage metering & limits

Plans, quotas, and enforcement that match how you actually charge — not how the demo faked it.

stack & standards

The stack, and why.

PostgreSQL

The default. Row-level security does tenant isolation where it fits, so the database enforces what the code promises.

Stripe Billing

Subscriptions, metered pricing, proration, and webhooks that are idempotent the first time.

RBAC

Roles, permissions, and membership checks enforced at the query layer, not sprinkled through the UI.

Background jobs

Queues for invoicing, emails, and exports — with retries, idempotency, and a dead-letter view.

Next.js + React

The product UI on the same stack we build everything else, so one team owns it end to end.

Audit logging

Who did what, to which tenant, when — recorded where support can read it and lawyers can export it.

how it runs

How a project runs.

step 01

Find the tenancy model

The single most expensive decision to get wrong. We prototype the data layer first and prove isolation before building on it.

step 02

MVP to first revenue

The shortest path to a paying customer: auth, one core workflow, billing, and the checks that make it trustworthy.

step 03

Harden with customers

Real tenants find the edge cases. We fix them with an audit trail, not heroics.

step 04

Scale the boring parts

Slow queries, queue backlogs, and cost per tenant — measured before they become emergencies.

questions we get asked

Before you ask.

A credible MVP — auth, billing, and one core workflow — is typically 8 to 12 weeks. Not all the features: the ones that let money move safely.

the rest of the team

Everything else we build.

Have a platform to launch?

Talk to the engineers who would actually do the work — no account managers, no sales deck. One call, then a written scope and a fixed price.

Book a scoping call