Headless D2C Storefront & Sub-Second Checkout Engine

Replacing a bloated Shopify storefront with a decoupled Next.js headless frontend and single-tap UPI/Stripe checkout drawer.

High-Volume D2C Apparel Brand•Sprint Duration: 5 Weeks•100% Verified Scope

Next.js 15GraphQLTailwind CSSShopify APIRazorpayUPI

Audited Performance Benchmark

0.8s

Mobile LCP

0.3s

Cart Drawer Speed

+28%

Checkout AOV

The Friction & Bottleneck

The Engineering Challenge

A high-volume D2C brand suffered 35% cart drop-offs on mobile ad traffic due to slow Shopify page reloads and clunky multi-step checkouts.

Solvantis Architecture

Our Engineered Solution

We built a custom headless Next.js storefront powered by Shopify GraphQL APIs, featuring instant cart drawers, single-tap UPI checkout, and automated webhook inventory sync.

Verified Qualitative Outcomes

Decoupled product page rendering from inventory backend, yielding 99/100 Mobile PageSpeed scores.

Implemented a fluid side drawer cart with instant coupon calculations and zero layout shift (CLS < 0.02).

Integrated single-tap UPI deep-linking for mobile Indian buyers, eliminating page redirect latency.

Technical Output

Technical Deliverables & Code Assets Handed Over

Headless Next.js Storefront

100% IP Transferred

Fluid Side Cart Drawer

100% IP Transferred

UPI & Stripe Payment Pipeline

100% IP Transferred

Warehouse ERP Sync Webhooks

100% IP Transferred

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