How We Built a Full-Stack E-Commerce Platform in 6 Weeks

The Brief

A client came to us with a familiar problem: they had a great product, a growing customer base, and a website built on an outdated platform that was costing them sales every single day. Slow load times, a clunky checkout, no mobile optimisation, and zero visibility on what their customers were actually doing.

They needed a complete rebuild — and they needed it fast. Six weeks. One team. No shortcuts on quality.

Here is exactly how we did it.

Week 1 — Discovery & Architecture

We spent the first week asking questions before writing a single line of code. What products do you sell? How do customers find you today? What does a successful purchase look like? Where are people dropping off?

By the end of week one, we had:

• A complete sitemap and user journey map
• A defined tech stack (Next.js, TypeScript, Firebase, Stripe)
• A component inventory — every UI piece we'd need to build
• A shared Figma file with the full design system: colours, typography, spacing, and the first set of high-fidelity screens

Architecture decisions made at this stage pay dividends for the entire project. We chose Next.js with server-side rendering so every product page would be fast and Google-indexable from day one. Firebase gave us a real-time backend that required zero infrastructure management. Stripe handled payments — because building your own payment flow in 2025 is a solved problem and not worth the risk.

Week 2–3 — Core Build

With design approved and architecture locked, the engineering team moved fast. We built in order of user priority:

1. Product catalogue — dynamic routes, ISR for fast page loads, image optimisation via Next.js Image
2. Cart & checkout — client-side cart state, Stripe Payment Element, webhook-based order confirmation
3. Admin dashboard — product management, inventory tracking, order management
4. Authentication — Firebase Auth with email/password and Google sign-in

We ran a daily 15-minute standup and used a shared Notion board to track progress. Nothing fancy — just clear ownership and no blockers sitting unresolved for more than 24 hours.

Week 4 — Polish & Performance

Features done. Now we made them fast and beautiful.

Every page was audited with Lighthouse. We hit 95+ on Performance, Accessibility, and Best Practices across all key routes. Image formats were converted to WebP. Critical CSS was inlined. Third-party scripts were deferred.

The result: a sub-1.8 second Largest Contentful Paint on mobile, on a real device over a 4G connection.

Week 5 — Testing & QA

We tested on real devices — not just Chrome DevTools. iPhones, Android mid-range phones, tablets. We ran through every user journey end-to-end: browse, filter, add to cart, check out, receive confirmation email, admin sees the order.

We also stress-tested the Stripe integration by running dozens of test payments — successful, declined, 3DS-challenged, network-interrupted. Every edge case handled gracefully.

Week 6 — Launch

DNS migrated. Deployment pipeline live. Monitoring set up. The client pressed the button on a Thursday morning.

No downtime. No bugs in production. Checkout conversion was up 34% compared to the legacy site within the first two weeks.

What We Learned

Six weeks is achievable when three things are true: the brief is well-defined before build begins, design and development run in parallel rather than sequentially, and decisions get made quickly without layers of sign-off.

Speed does not require cutting corners. It requires cutting scope creep.

If you have a project that needs to move fast without sacrificing quality, we should talk.