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.

Client: High-Volume D2C Apparel Brand•Duration: 5 Weeks•100% Audited Production Outcome
Stack:Next.js 15GraphQLTailwind CSS
The Friction & Bottleneck

The Engineering & Business 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.

Identified Friction: Inefficient legacy bottlenecks impeding scale
Commercial & Technical Targets

Project Objectives

Eliminate user drop-off across complex multi-step interactions for D2C Ecommerce.
Achieve sub-1.2s Core Web Vitals and zero cumulative layout shifts on high-traffic viewports.
Replace fragile legacy or manual steps with scalable, automated webhook and API architecture.
Milestone Target: Complete Milestone Sign-Off
Solvantis Architecture & Execution

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.

Features & Code Deliverables Handed Over

4 Assets
01
Headless Next.js StorefrontProduction Validated
02
Fluid Side Cart DrawerProduction Validated
03
UPI & Stripe Payment PipelineProduction Validated
04
Warehouse ERP Sync WebhooksProduction Validated
UI/UX Architecture

Visual Design Strategy

Engineered with Solvantis atomic design tokens, high contrast visual hierarchy, and sub-16ms fluid state transitions.

Bespoke HSL Dynamic Palette
Fluid Type Scales
WCAG 2.2 AA Contrast Standards
Micro-Interactions

Full keyboard navigation, semantic headings, and ARIA compliant roles across mobile and desktop.

Engineering Stack

Production Technologies

Selected for reliability under peak load, sub-second latency, and zero vendor lock-in.

Next.js 15GraphQLTailwind CSSShopify APIRazorpayUPI
Ecosystem Integrations

API & Data Pipelines

Connected data pipelines powering synchronized inventory, analytics, and CRM automation.

Next.js 15 App Router Architecture
Edge Runtime & Cloudflare Turnstile Security
CRM & Lead Webhook Handshake (HubSpot / Salesforce)
Payment Gateway Pipeline (Razorpay / Stripe)
Commercial Business Outcomes

Audited Business Impact & Conversion Lift

Engineering focused squarely on business growth: reducing churn, multiplying lead response speed, and cutting unnecessary recurring SaaS seat costs.

0.8s

Mobile LCP

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

0.3s

Cart Drawer Speed

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

+28%

Checkout AOV

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

Production System Architecture & Screens

Verified Interface Deployment Showcase

Cloud Live Stage
LCP Rendering Speed

0.7s - 1.1s

Eliminated client render blocking via Next.js Server Components.

Mobile Responsiveness

360px - 4K

100% fluid layouts with zero horizontal scroll overflow.

Accessibility Score

100 / 100

Passed WCAG 2.2 AA audit for contrast and keyboard focus.

"The technical depth and speed of delivery was extraordinary. Our conversion numbers improved immediately after launch."

Product & Technology Lead•Client Architecture Review•High-Volume D2C Apparel Brand
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