From Prompt to Production: a One-Day Next.js SaaS with Stripe
Timebox the build. The goal: auth, billing, roles, and an operable admin in 24 hours. Here's the hour-by-hour playbook I use for founders and enterprise pilots.
9:00-Scaffold with an AI MVP builder
Spin up Next.js 14 (App Router), TypeScript, Prisma, and Postgres. Let your preferred AI MVP builder generate boilerplate pages, data models, and tests. Keep it opinionated: shadcn/ui, Tailwind, Zod, and Auth.js for OAuth and email magic links.
- Create a tenant-aware "Organization" model from the start.
- Define User, Membership, Role tables; include soft deletes and createdBy fields.
- Add health, readiness, and version endpoints to de-risk deploys.
11:00-Wire an admin dashboard template AI
Use an admin dashboard template AI to output a metrics home, user grid, billing panel, and feature flags. Replace fake services with real repositories; never let the template own your domain logic.
- Surface KPIs: Active Seats, MRR, Churn Risk, and API Error Rate.
- Add drilldowns that link back to organization and subscription detail.
- Gate every action with a server-side policy, not just client checks.
13:00-Generate roles with an RBAC generator for SaaS
Prompt a roles-permissions matrix: Owner, Admin, Member, Billing, ReadOnly. Have the RBAC generator for SaaS emit migration scripts, policy helpers, and test fixtures.
- Store permissions in code; cache in Redis; invalidate on role change.
- Use guards in route handlers and React Server Components.
- Log denied decisions with correlation IDs for audits.
15:00-Stripe subscriptions that actually stick
Create Products and Prices in Stripe; store their IDs in env vars. Use Checkout for new customers, Customer Portal for upgrades, and webhooks for truth. Persist status, period_end, and cancel_at in your Subscription table.
- Verify signatures; use idempotency keys; retry with exponential backoff.
- Map events to states: checkout.session.completed → active, invoice.payment_failed → past_due.
- Stripe CLI for local webhooks; mirror to staging before prod.
17:00-Deploy, observe, harden
Ship to Vercel; provision Postgres (Neon or Supabase). Add OpenTelemetry traces, request metrics, and structured logs. Rate-limit auth and billing routes. Backfill analytics to the admin in real time.
- Feature-flag risky changes; default new features to off for paid tenants.
- SLA guardrails: 3 nines uptime, 200ms P95 for dashboard queries.
- Run chaos tests: kill Postgres read replica; assert graceful degradation.
What you'll have by 18:00
A production-capable Next.js SaaS with auth, Stripe billing, role-aware UI, and an auditable admin. The stack is boring; the speed is not. Start with prompts, end with revenue.
18:00-Polish that converts
Add onboarding checklists, seeded demo data, and an in-app pricing nudge tied to usage. Document APIs with OpenAPI; publish an SDK. Use status page and runbooks linked from the admin.
- Introduce trial-to-paid email automations via Stripe events.
- Snapshot RBAC and config on every deploy for rollback safety.
