Build Headless Shopify Activewear Store

Project Posting: Full-Stack Shopify Plus / Headless Developer for D2C Technical Activewear E-Commerce Store (Radian Theme Aesthetic)
Project Budget: Fixed Price / Milestone-Based (Competitive market rates based on proven portfolio)

Project Timeline: 6 to 8 Weeks

Location / Remote: Remote (Global / Asynchronous with regular milestone syncs)

Project Overview
We are launching a high-performance, direct-to-consumer (D2C) technical activewear brand. We require an elite Full-Stack E-Commerce Developer / Agency to build a lightning-fast, conversion-optimized storefront from the ground up.

The aesthetic benchmark for this build is the Radian theme style: an ultra-dark, brutalist industrial look featuring high-contrast monochrome (pitch black #000000, charcoal #121212, sterile white #FFFFFF), flatlock inverted contrast seams, gothic/blackletter typography, and raw utilitarian performance gear presentation.

The architecture will leverage Shopify Plus / Headless (Next.js front-end connected to Shopify Admin & Storefront APIs) backed by PostgreSQL/Supabase and automated 3PL logistics middleware.

Key Deliverables & Scope of Work
1. Front-End Development (Next.js / Tailwind CSS / Radian Theme UI)
Design System Implementation: Build a custom, high-performance UI matching the brutalist industrial aesthetic (pitch black/monochrome, custom typography, zero layout shift).

Dynamic PDP (Product Detail Page):

Sticky Add-to-Cart bar with instant variant switcher (Size: S-XXL, Fit Profile: Oversized / Compression).

Interactive Technical Spec Sheets (GSM weight breakdown, 4-way stretch nylon-mesh fabric details, care instructions).

Immersive full-screen media grids and macro photo galleries.

PLG & Collection Grids: Lightning-fast product listing pages with instant filtering, sorting, and low-stock badge indicators.

2. Shopify Integration & Backend Architecture
Shopify Storefront API Integration: Full headless connection for dynamic cart management, checkout redirection, and inventory sync.

Variant Matrix & Bundling: Setup multi-attribute variants and custom kit builder logic (e.g., bundle compression top + 350 GSM joggers with automated bundle discounts).

Supabase / PostgreSQL Database Setup: Implement auxiliary data tables for User Fit Lockers (saving height, weight, fit preference), VIP waitlists, and custom customer profiles.

3. Checkout, Payments & Regional Gateways
Express Checkout Optimization: Seamless integration for Apple Pay, Google Pay, Shop Pay, and UPI Intent flows (PhonePe, Google Pay, Paytm).

Payment Gateway Integration: Razorpay / Cashfree integration supporting Credit/Debit Cards, Net Banking, UPI, and verified Cash on Delivery (COD) workflows to mitigate RTO (Return to Origin).

Multi-Currency Support: Geo-IP currency detection (INR, USD, EUR, GBP).

4. Logistics, 3PL & Fulfillment Automation
Courier Aggregator Middleware: Integrate Shiprocket / Delhivery / Blue Dart APIs.

Automated AWB & Manifest Generation: Webhook-driven order routing that triggers label generation and shipping status updates upon payment capture.

Branded Tracking & Returns Portals: Custom /pages/track portal for real-time milestone tracking and an automated self-serve return/exchange module.

5. Marketing, Tracking & Performance Optimization
Analytics & CAPI: Server-side Meta Conversions API (CAPI) and Google GA4 event tracking (PageView, AddToCart, InitiateCheckout, Purchase).

Klaviyo Integration: Abandoned cart flows, browse abandonment, and restock alert webhooks.

Performance Benchmark: Deliver a Lighthouse performance score of 95+ with optimized image loading, edge caching, and bot-mitigation rate limiting.

Technical Stack Requirements
Front-End: Next.js (App Router), React, TypeScript, Tailwind CSS, Framer Motion.

Commerce Backend: Shopify Admin GraphQL API, Shopify Storefront API.

Database & State: PostgreSQL (Supabase), Redis (Caching & Rate Limiting).

Hosting & CDN: Vercel Enterprise, Cloudflare DNS.

APIs: Shiprocket/Delhivery logistics APIs, Razorpay/Cashfree payment gateways, Klaviyo, Meta CAPI.

Ideal Candidate / Agency Profile
Proven Portfolio: Must showcase live Shopify Plus, headless Next.js, or high-end apparel/streetwear/activewear stores with exceptional design execution (dark mode, brutalist, or minimalist luxury aesthetics).

API & Webhook Mastery: Deep experience handling complex Shopify webhooks, inventory syncing, and third-party logistics (3PL) API integrations.

Performance Obsessed: Demonstrated ability to build blazing-fast web apps with optimized Core Web Vitals.

Communication & Code Standards: Clean, well-documented code repositories (GitHub), adherence to strict version control, and transparent milestone reporting.

Application Requirements
When applying, please provide:

Links to 2–3 live, production-grade e-commerce stores you have built (specifically highlighting Next.js/Headless Shopify or high-aesthetic apparel brands).

A brief overview of your technical approach to handling headless Shopify architecture and inventory synchronization.

Your estimated timeline and milestone breakdown to complete this scope.