How Green Commerce Handled a 5x Traffic Spike and Boosted Conversions by 22% with Headless Shopify
Written by Adrian K., Founder & Lead Engineer at Codanum
The Context
Green Commerce's marketing was outrunning its technology. Influencer campaigns and organic growth had built real momentum for the sustainable goods retailer, but the monolithic storefront behind it was slow, hard to customise, and prone to falling over exactly when traffic spiked.
The Challenge
The legacy storefront crashed during a major influencer flash sale, costing an estimated $80k in lost revenue in a single hour. The mobile checkout experience was clunky, producing a 68% cart abandonment rate, nearly double the industry average. A complete re-platforming needed to be delivered before Black Friday weekend.
+22%
Conversion
5x
Traffic Spike
The Solution
We re-platformed onto a headless Shopify architecture driven by Next.js, deployed globally on Vercel's edge network. Static site generation (SSG) across the full product catalog reduced bundle sizes significantly and cut Time to First Byte (TTFB) to under 200ms. The checkout flow was redesigned using purpose-built React components optimised for mobile conversion.
The Impact
Mobile conversion rates increased 22%, attributable directly to sub-second page transitions on mobile. The edge-cached infrastructure handled a 5× traffic spike during Black Friday with zero downtime and consistent UX across all devices.
"We went from holding our breath and praying the site wouldn't crash during sales, to watching the live analytics dashboard with absolute confidence. The speed of the new site is our biggest competitive advantage."
