SaaS MVP Shipped in 14 Days: From Napkin Sketch to Paying Customers
How a solo founder went from idea to $4,200 MRR in two weeks with a project management SaaS built on Next.js, PostgreSQL, and Stripe.
Client: TaskPilot (Confidential until launch)
Dashboard screenshot showing Kanban board with task cards, team avatars, and a sidebar with project list. Clean white UI with blue accent color and a 'New Project' CTA button.
The Challenge
The founder had been managing freelance projects across Notion, Google Sheets, and Slack for two years. Every new client meant another spreadsheet, another folder structure, another Slack channel. The overhead was eating 12 hours per week that should have been billable. She had tried Asana, Monday, and ClickUp but none of them fit the freelance agency workflow: per-client billing, contractor access controls, and deliverable tracking with client approval gates. After a failed attempt to build it herself using a no-code tool (which hit a wall at the billing logic), she needed a production-grade MVP that could handle real money from day one. The clock was ticking because she had 8 existing clients willing to pay $50/month if the tool existed by end of month.
Our Approach
We started with a 90-minute scope call to map the core loop: create project, assign tasks, track hours, invoice client. Everything else got cut from v1. The architecture was deliberately boring: Next.js App Router for the frontend with server components for fast initial loads, PostgreSQL on Railway for the database, Drizzle ORM for type-safe queries, and Stripe for subscriptions. Auth went through Better Auth with Google and email magic links. We used a monorepo structure so the marketing site and app shared components and types. Day 1 through 3 focused on the data model and auth flow. Days 4 through 7 built the Kanban board, task CRUD, and real-time updates via server-sent events (no WebSocket complexity needed for this scale). Days 8 through 10 handled the billing engine: Stripe subscription creation, usage-based add-ons for extra seats, and webhook handlers for failed payments. Days 11 through 12 were the client portal: a stripped-down view where end clients could see deliverables and approve work. Day 13 was load testing, security hardening (CSP headers, rate limiting, input sanitization), and CI/CD setup. Day 14 was production deployment and founder walkthrough.
What We Built
Delivery Timeline
Day 1-3: Foundation
Data model design, auth flow, CI/CD pipeline setup, and project scaffolding with Next.js App Router.
Day 4-7: Core Product
Kanban board, task CRUD, assignee management, real-time SSE updates, and basic dashboard.
Day 8-10: Billing Engine
Stripe subscription integration, seat-based pricing, webhook handlers, and invoice generation.
Day 11-12: Client Portal
View-only client access with deliverable approval workflow and email notifications.
Day 13: Hardening
Security audit (CSP, rate limiting, CORS), load testing, Playwright E2E tests, and Sentry setup.
Day 14: Launch
Production deployment to Railway + Vercel, DNS configuration, founder training session, and handoff.
Tech Stack
Architecture
frontend
Next.js 14 App Router with React Server Components and Tailwind CSS.
backend
Next.js API routes with Drizzle ORM on PostgreSQL (Railway).
auth
Better Auth with Google OAuth and email magic links.
data
PostgreSQL with Drizzle ORM. Redis for session cache.
payments
Stripe Subscriptions with webhook handlers for lifecycle events.
Security
rbac
Three roles: Owner, Contractor (limited), Client (view-only). Row-level security on all queries.
secrets
Environment variables via Railway. No secrets in code.
monitoring
Sentry for error tracking. Uptime monitoring via BetterStack.
qa
End-to-end tests for auth flow, payment flow, and task CRUD with Playwright.
The Results
“I spent 6 months trying to build this on Bubble and got nowhere. HouseofMVPs shipped something better in 2 weeks. My clients started paying before the Stripe webhook emails even stopped pinging.”
Key Takeaways
Boring tech wins: Next.js + PostgreSQL + Stripe is the fastest path to a production SaaS. No need for microservices, GraphQL, or bleeding-edge frameworks for v1.
Cut the client portal to view-only for v1. The founder wanted collaborative editing, but approval-only was enough to charge $50/month. Feature creep is the enemy of shipping.
Stripe webhooks are the hardest 'easy' integration. We spent a full day on idempotency, retry logic, and edge cases (expired cards, disputed charges). Budget time for this.
Deliverables
FAQ
Frequently Asked Questions
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