Build a SaaS Application in 21 Days
Multi-tenant, Stripe Billing, team workspaces — production-grade SaaS from day one.
Why SaaS Application development is hard to get right
Multi-tenancy is the hardest part of SaaS architecture — retrofitting it later costs 2× a fresh build
Stripe Billing for subscriptions, trials, and upgrades is complex to wire correctly
Team/workspace management (invites, roles, permissions) is always underestimated in scope
Most SaaS MVPs have terrible onboarding — users sign up and don't know what to do next
What we build — in detail
Multi-tenant architecture
Row Level Security in Supabase from commit #1. Every query is tenant-scoped at the database level — no accidental data leakage between workspaces.
Authentication & workspaces
Sign up, email verification, workspace creation. Team invites via email — invite link or email+role. Multiple workspaces per user.
Stripe Billing
Plan selection, credit card, trial period, auto-charge. Upgrade/downgrade with proration. Cancellation with access-to-period-end. Webhook handling.
Feature flags per plan
Each plan tier unlocks features. Upgrade prompts when hitting limits. Clean plan enforcement without spaghetti if/else logic.
Core product features
Whatever your SaaS does — we scope and build the core v1 feature set in the available timeline.
Onboarding flow
Guided setup wizard to reach the 'aha moment' as fast as possible. Empty state design for every blank screen.
Admin panel
User management, workspace overview, revenue dashboard, feature flag overrides for customer support.
Tech Stack
- →Next.js 15 (App Router)
- →Supabase (Postgres + Auth + RLS)
- →Stripe Billing
- →Resend (transactional email)
- →Vercel
- →Tailwind CSS
What you get
- Full-stack SaaS web application
- Stripe Billing integration
- Admin panel
- Full source code (100% yours)
- Technical documentation
Frequently asked questions
Do you build multi-tenant from day one?
Always. Single-tenant-first is the #1 technical debt trap in SaaS. Our Supabase + RLS architecture enforces tenant isolation at the database level from the first commit.
How do you handle Stripe trial-to-paid conversion?
Stripe's trial_period_days on subscriptions handles this natively. We configure the trial UX, trial reminder emails (3 days before expiry), and trial-to-paid conversion flow. RevenueCat handles the same for mobile.
Can you add SSO for enterprise customers?
Yes — WorkOS or Clerk handles SAML SSO. Enterprise SSO typically adds 1 week to the build. We design the auth architecture to accommodate it from day one even if we ship it in v2.
Free SaaS Application resources
Download these before you start — no credit card, just your email.
Ready to build your saas application?
Book a free 30-minute scoping call. We'll map out exactly what v1 looks like, give you a fixed price, and start within a week.
Book a Free Scoping Call →Free · No commitment · Delivered in 3–5 weeks