SaaS MVP in 90 Days:
Our Development Playbook

The exact sprint structure, tech stack decisions, and prioritisation framework we use to take SaaS ideas from zero to a live product in 90 days — without cutting corners on quality or scalability.

Why 90 Days Works

Ninety days is not an arbitrary deadline. It is the longest window a founder can hold focus, momentum, and investor/stakeholder interest before the narrative starts to drift. Beyond 90 days, scope creep, feature debates, and "just one more thing" syndrome kill more MVPs than bad code ever does.

We have shipped 14 SaaS products in the last three years. The ones that launched in 60–90 days consistently outperformed the ones we spent 6 months "perfecting". Why? Because real users immediately invalidate 40% of your assumptions — and you can only learn that by shipping.

The Sprint Structure: 6 × 2-Week Blocks

We break the 90-day window into six two-week sprints, each with a defined output and a clear "done means done" definition:

1. Sprint 1 — Foundation: Infrastructure setup (cloud, CI/CD, environments), authentication system, database schema v1, design system tokens. Output: a running blank app you can log into.
2. Sprint 2 — Core Feature 1: The single most important feature — the one without which the product is not the product. Build it to 80% polish. Output: the primary user action works end-to-end.
3. Sprint 3 — Core Feature 2 + Integrations: The second critical feature plus any external integrations (payment, email, analytics). Output: a basic but complete user journey.
4. Sprint 4 — Polish + Edge Cases: No new features. Fix everything broken from sprints 2 and 3. Add loading states, error messages, empty states. Output: the core journey works without embarrassing failures.
5. Sprint 5 — Admin, Billing, Onboarding: The features users never see but the business cannot run without. Stripe integration, admin dashboard, email sequences, onboarding flow. Output: the product can actually generate revenue.
6. Sprint 6 — QA, Performance, Launch Prep: Load testing, security review, SEO basics, launch checklist, first marketing assets. Output: the product is live and the first 50 users are invited.

Tech Stack Philosophy

We do not use the most exciting stack. We use the most boring stack that solves the problem reliably. Our default choices for 80% of SaaS projects:

• Frontend: Next.js 14 (App Router) — fast, SEO-friendly, large talent pool in Dhaka, good for hiring later.
• Backend: Node.js with Express or Next.js API routes for simpler products; Go for anything that needs serious performance under load.
• Database: PostgreSQL via Supabase for most projects — gives you a hosted Postgres database, auth, real-time subscriptions, and edge functions without running your own infrastructure.
• Payments: Stripe for international, SSLCommerz or ShurjoPay for Bangladesh domestic payment methods.
• Email: Resend — better deliverability than SendGrid at lower price points for early-stage products.
• Hosting: Vercel for frontend, Railway or Render for backend services. Both auto-scale without DevOps expertise.

We never spend Sprint 1 debating whether to use React or Vue. The default is Next.js until there is a specific technical reason it does not fit.

The MoSCoW Prioritisation Framework

Every feature request goes through a four-bucket filter before it touches a sprint:

• Must Have: The product is broken without this. It goes into Sprint 1–3.
• Should Have: Significantly improves the product but is not launch-blocking. Sprint 4–5 or post-launch v1.1.
• Could Have: Nice but not necessary. Backlog only.
• Will Not Have (this sprint): Explicitly acknowledged and deferred. This bucket prevents scope creep.

Founders almost always want to move 70% of the "Should Haves" into "Must Haves". Our job is to hold the line. Every feature added to the MVP extends the timeline and increases the chance of shipping nothing.

What We Learned from the Failures

Two of our 14 products did not hit the 90-day window. Both failed for the same reason: the founder changed the core concept after Sprint 3. Not tweaked — fundamentally changed. Going from a B2B invoicing tool to a B2C expense tracker mid-build is not a pivot, it is starting over.

Our intake process now includes a "pivot resistance test": we ask founders to write down the one sentence the product does for users and sign it. If that sentence changes, the project restarts the clock.

The 90-day clock is not the constraint — it is the forcing function. Use it.