We build the SaaS platform you sell — multi-tenant auth, subscription billing, and an admin back office — and you own the repository. From $12,500, taking real payments in six weeks.
The definition of done is not a demo. It is a stranger creating an account, entering a card, being charged, and getting exactly what their plan entitles them to. Tenant isolation is enforced by the database, not by remembering to write the right WHERE clause.
Not in the features. In the plumbing nobody scoped.
The demo goes well. The screens look right. Then someone asks what happens when a customer downgrades mid-cycle, or how an agency invites a sub-account, or whether a cancelled card actually closes the door — and the answer is a quiet three weeks of unplanned work.
Underneath that sits the decision almost nobody makes on purpose: how tenants are separated. Get it wrong and you do not find out during the build. You find out when a customer sees a row that belongs to someone else, and by then it is woven through every query you have written.
So we build in the opposite order. Tenancy, auth, billing, and entitlement come first, because they are the parts that are expensive to change and boring to demo. Your product surface sits on top of a foundation that already holds.
What every platform actually needs
Six things that are in scope here and quietly optional elsewhere.
Multi-tenancy that actually isolates
Every row carries a tenant. Row-level security enforces it at the database, not in your application code — so a missed WHERE clause in a route handler cannot leak one customer's data to another. This is the part that is expensive to retrofit and cheap to do first.
Billing wired to entitlement
Subscriptions, trials, upgrades, downgrades, proration, failed payments, and dunning — connected to what the user can actually do. A cancelled plan should close the door on the next request, not the next billing cycle.
The admin dashboard you forgot to scope
Every SaaS needs a back office: find a customer, see their plan, comp an account, refund, impersonate to reproduce a bug. Teams routinely skip it and end up running the business from SQL. We build it in.
Auth that survives contact with users
Sign-up, sign-in, password reset, email verification, OAuth providers, sessions that persist across subdomains, and roles. Boring, load-bearing, and the source of most launch-week emergencies when it is rushed.
Usage metering, if you charge for it
Per-seat is easy. Per-execution, per-credit, and hybrid plans need event capture, aggregation, quota enforcement, and an honest usage view for the customer. We have shipped metered billing and will tell you if your pricing model needs it.
You own the repo
Source, infrastructure config, migrations, and documentation are handed over at launch. No platform seat on your own product, and no vendor positioned between you and your customers.
What you actually receive
A platform in production with paying tenants on it, plus everything needed to keep building without us.
Build my quote- Data model and tenancy design — the decision everything else inherits
- Auth: sign-up, sign-in, reset, verification, OAuth, roles, sessions
- Multi-tenant isolation enforced at the database with row-level security
- Subscription billing with plans, trials, upgrades, proration, and dunning
- Entitlement checks so plan state actually gates product access
- Customer-facing dashboard — the product surface your users log into
- Admin back office — search, plan management, comps, refunds, impersonation
- Transactional email for the lifecycle events that cannot silently fail
- Deployment, monitoring, and error alerting on your infrastructure
- Handoff: repo, migrations, credentials, docs, and a walkthrough recording
A typical SaaS build vs this one
Compared on what is in scope and who owns what — not on benchmarks, because we have no sourced study on average SaaS build cost and are not going to invent one.
* Structural comparison. The 'typical' column describes patterns we repeatedly find when taking over stalled builds, not a published benchmark.
Six weeks, tenancy model to first paying customer
Billing lands in week 3, so you watch money move through the system halfway in — not on the last day.
Week 1
Model the tenant
Who is the customer — a person, a company, an agency with sub-accounts? That answer determines your schema, your billing, your permissions, and how hard growth will be later. We settle it before writing product code.
Week 2
Auth and isolation
Sign-up through session handling, roles, and row-level security policies on every tenant-scoped table. We test isolation by trying to break it — reading across tenants deliberately and confirming the database refuses.
Week 3
Billing and entitlement
Plans, trials, upgrades, downgrades, proration, failed payments, and dunning — then the entitlement layer that makes plan state gate real product access on the very next request.
Weeks 4–5
The product surface
The dashboard your customers log into, built on the tenancy and entitlement foundation underneath. This is the part that differs entirely per client, and it is why scoping is a conversation, not a form.
Week 6
Admin, deploy, hand over
Back office, monitoring, error alerting, and production deployment. Then the repo, migrations, credentials, docs, and a walkthrough recording are yours, with 30 days of tuning while your first real tenants arrive.
SaaS Platform Pricing
One-time builds, not seats. Deployed to your accounts, owned by you.
SaaS Launch
one-time · 6 weeks
A real platform taking real money.
Founders who need to be selling, not demoing — and investors who ask to see the billing.
- Multi-tenant architecture with row-level security
- Full auth: sign-up, reset, verification, OAuth, roles
- Subscription billing with trials and proration
- Entitlement layer gating product access by plan
- Customer dashboard + admin back office
- Deployment, monitoring, error alerting
- Repo handoff — you own it
- 30 days post-launch tuning
SaaS Scale
one-time · 10 weeks
Usage-based billing and agency-grade tenancy.
Platforms with metered pricing, sub-accounts, or resellers underneath them.
- Everything in Launch, plus —
- Usage metering with quota enforcement
- Hybrid pricing — seats plus consumption
- Nested tenancy for agencies and sub-accounts
- White-label theming per tenant
- Stripe Connect for revenue sharing with resellers
- 0nMCP integration — 1,640 tools available to your product
- Public API with keys, scopes, and rate limits
Embedded
retainer
Your product team, on retainer.
Live platforms that need continuous delivery rather than another project.
- Everything in Scale, plus —
- Ongoing feature delivery on a standing retainer
- Performance and cost work as you grow
- SOC-2-oriented hardening if you are heading to enterprise deals
- SLA + priority response
- Direct line into the 0nMCP roadmap
Every build is deployed to your own accounts — your hosting, your database, your Stripe — so revenue and customer data never route through us. Infrastructure is billed by your providers at cost.
Questions people actually ask
How much does it cost to build a SaaS platform?
A launch-ready multi-tenant platform with authentication, subscription billing, a customer dashboard, and an admin back office starts at $12,500 and takes about six weeks. Adding usage-based metering, nested tenancy for agencies or resellers, white-label theming, and a public API is $24,500 over roughly ten weeks. Ongoing product development runs as a retainer. The variable that moves the number is not the plumbing — auth, tenancy, and billing are broadly the same shape every time — it is the product surface your customers actually log in to use.
What does multi-tenant actually mean, and why does it matter so much?
Multi-tenant means many customers share one deployment while each sees only their own data. It matters because it is the one decision that is genuinely expensive to change later — it touches your schema, your queries, your permissions, your billing, and your migrations. We enforce it with row-level security in the database rather than in application code, so a mistake in a single route handler cannot expose one tenant's records to another. Retrofitting that onto a single-tenant codebase usually means a rewrite.
Do you use a low-code platform or write real code?
Real code — TypeScript, Next.js, Postgres, and Stripe, deployed on infrastructure you control. Low-code tools are genuinely good for internal tools and prototypes. They become a problem when the product you are selling lives inside someone else's platform, because your margin, your uptime, and your ability to leave are all set by a vendor. If a low-code tool is the right answer for your case, we will say so and point you at one.
Can I see a SaaS platform you have actually built?
Yes, and you can use them without talking to us first. 0nCore (0ncore.com) is a multi-tenant platform with auth, subscription billing, and an add-on marketplace. CRO9 (cro9.com) runs analytics and conversion tooling across client sites. RocketPost (rocketpost.co) is a subscription product with tiered plans. All three are live, all three take payment, and all three run the same architecture described on this page.
Who owns the code and the customer data?
You own both. At handoff you receive the repository, the database migrations, the infrastructure configuration, the credentials, and a walkthrough recording. The platform is deployed to your accounts — your Vercel, your database, your Stripe — so your customer relationships and your payment processing are yours from day one. There is no per-seat licence on your own product and no vendor who can switch it off.
What if I only need a prototype to raise money?
Then say so and we will scope it smaller — but be aware of the trade. A prototype that cannot take payment tends to be the thing you throw away, and investors increasingly ask to see real revenue mechanics rather than a clickable demo. The six-week Launch build exists precisely because the gap between 'it demos' and 'it charges people' is where most SaaS projects quietly stall.
How long until my first paying customer can sign up?
Six weeks for the Launch build, and that milestone is deliberate: the definition of done is a stranger creating an account, entering a card, being charged, and receiving exactly what their plan entitles them to. Billing lands in week 3, so you will see money move through the system in a test environment about halfway through the engagement rather than at the very end.
Bring the idea. We will tell you what it costs to charge for it.
Scoping is a conversation, not a form — the plumbing is predictable, your product surface is not. If an off-the-shelf tool already does what you need, we would rather tell you that than build it twice.
30 minutes from quote to kickoff
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