# SaaS Development

> Bespoke SaaS on Next.js and Postgres: multi-tenancy, Stripe billing, role-based access and analytics designed in, so your MVP scales without a rewrite.

**Provider:** Oxwyn Studio (https://oxwynstudio.com)
**Page:** https://oxwynstudio.com/services/saas-development

## Summary

SaaS development at Oxwyn Studio means building a paying software-as-a-service MVP on Next.js and Postgres with multi-tenancy, Stripe subscription and seat-based billing, role-based access control, feature gating and product analytics designed in from the first commit, so the product can safely take money and scale past its first hundred customers without a rewrite.

## Why you need this

- **Charging money turned into a full refactor** Plans, seats, trials, proration, invoicing and access rules all have to land at once, on top of code never designed for them, while real customers are already using the app.
- **Tenant data leaked between accounts** One customer seeing another's data is the single worst SaaS failure. It ends trust, contracts and often the company. Bolted-on tenancy almost always has a gap.
- **No idea what users actually do** Pricing, onboarding and retention run on hunches. You cannot see activation, where trials stall, or which features drive upgrades, so growth decisions are guesses.

## The method - build path

01. **Model tenancy** - Pick the isolation model, design the org and membership schema, and enforce it with row-level security before any feature is built. (Org model, RLS)
02. **Wire billing** - Connect Stripe for subscriptions, seats and metered usage, with idempotent webhooks that keep entitlements in sync. (Stripe, Seats, Metered)
03. **Roles & gating** - Build role-based access, team invites and feature gating so plans, permissions and limits are enforced everywhere. (RBAC, Invites, Flags)
04. **Instrument** - Capture activation, retention and feature-usage events, and build the admin console to support and understand customers. (Analytics, Funnels, Admin)
05. **Launch & iterate** - Ship the paying MVP, watch real usage, and harden the parts that take live load, with a runbook your team can operate. (Launch, Runbook)

## What's included

- Multi-tenant data model with row-level security
- Stripe subscriptions: seats, metered usage, trials and proration
- Role-based access, team invites and feature gating
- Product analytics: activation, retention and feature usage
- Admin console with safe impersonation and audit logging
- Transactional email for invites, receipts and lifecycle
- Onboarding flow and customer billing portal
- Operations runbook and handover so your team can run it

## SaaS foundations - six capabilities

### 01. Multi-tenancy
Organisations, members and per-tenant data isolation enforced at the database with row-level security.
Techniques: Org model, RLS, Data isolation.

### 02. Subscriptions and billing
Stripe-native plans, seat-based and metered pricing, trials, proration, invoices and a billing portal.
Techniques: Stripe, Seats, Metered, Proration.

### 03. Roles and teams
Role-based access control, team invites, ownership transfer and granular permissions across every surface.
Techniques: RBAC, Invites, Permissions.

### 04. Feature flags and gating
Plan-based feature gating and flags so you can ship, limit and price features without redeploying.
Techniques: Flags, Plan gating, Limits.

### 05. Product analytics
Activation funnels, retention cohorts and feature-usage events so pricing and onboarding run on data.
Techniques: Funnels, Cohorts, Events.

### 06. Admin and support
An internal admin console with safe impersonation, audit logging and the controls to support customers.
Techniques: Admin, Impersonation, Audit log.

## Stack & tooling

Next.js, React Server Components, PostgreSQL + RLS, Stripe Billing, TypeScript, Product analytics.

## FAQ

### What exactly is a SaaS MVP build?

It is a paying product with the foundations that decide whether it scales: multi-tenancy, subscription billing, roles and product analytics, built on Next.js and a Postgres database. It is the smallest version that can safely take money and grow without a rewrite.

### Why not just add billing and tenancy later?

Because both touch every table and every route. Retrofitting multi-tenancy or billing onto a prototype usually means a large, risky refactor under live customer load. Designing them in from commit one is dramatically cheaper and safer.

### How do you stop one customer seeing another's data?

Every table is scoped by organisation and protected with row-level security, and requests pass through a gateway that stamps the org context. Isolation is enforced at the database, not just in application code, so a single bug cannot leak data across tenants.

### What billing models can you support?

Stripe-native flat-rate plans, per-seat pricing, metered and usage-based billing, free trials, proration on upgrades and downgrades, invoices and a self-serve customer billing portal. The MRR simulator on this page reflects the model we wire in.

### Do we own the code and the data?

Yes. You own the repository, the database and every integration. There is no platform lock-in and no per-seat tax to a third-party app builder, you can host it and evolve it however you like.

### What stack do you build SaaS on?

Next.js with the App Router and React Server Components, a Postgres database with row-level security, Stripe for billing, and product analytics. The same modern, owned stack we use across every service.

### Can you take over an existing prototype?

Often, yes. We audit the prototype, map what is safe to keep, and add the tenancy, billing and analytics foundations around it, rather than throwing away working product.

### How do you handle product analytics and privacy?

We instrument activation, retention and feature-usage events with a privacy-conscious setup, scoped per tenant, so you get the funnel insight you need without mishandling customer data.

## Keywords

SaaS development, multi-tenant SaaS, SaaS MVP development, subscription billing development, Stripe SaaS, build a SaaS app, Next.js SaaS, role-based access control, product analytics, B2B SaaS development

## Next step

Book a scoping call: https://oxwynstudio.com/contact