Senior Shopify Developer - Custom Theme Build (Subscriptions, Performance) - 4-Month Project

We're a Shopify agency building a premium DTC store for a client, and we need a senior Shopify developer to own the build end-to-end. This is a custom theme from scratch against detailed Figma designs, not a template tweak. ~4 months, ~34 hours/week, async-first with daily sync calls. If you've only modified existing themes or worked through page builders, this isn't for you. If you've built custom OS 2.0 themes with real commerce logic and can hit a strict performance budget, read on. What you'll build: Custom Shopify theme (Dawn fork, OS 2.0 sections, fully theme-editor configurable) Native Shopify Subscriptions (Selling Plans API) + Customer Account UI Extensions Discount-stacking prevention (cart-level JS + Shopify Functions) Server-side tracking with deduplication (GA4, Meta CAPI, Google Ads, TikTok) Custom Klaviyo event pipeline using variant-level metafield data Server-rendered Schema.org JSON-LD (Product, Article) Affiliate platform integration A content/editorial section, structurally partitioned from commerce Motion (GSAP, loaded per-template) Must-haves: 3+ years senior Shopify development - real custom theme work, not light tweaks Deep Liquid + OS 2.0 sections built from scratch Strong vanilla JavaScript - AJAX cart, IntersectionObserver, no framework dependency on the storefront Shopify metafields/metaobjects - fluent in variant-level vs product-level scope Storefront API + Admin API Server-rendered Schema.org / JSON-LD validated against Rich Results Test Proven Lighthouse 90+ track record on production stores; Core Web Vitals knowledge Klaviyo Shopify integration (events API, custom payloads) Git + CI/CD Strong written English, comfortable async Big plus: Native Shopify Subscriptions + Customer Account UI Extensions (Preact, Polaris) GSAP, Shopify Functions, server-side tracking apps (WeltPixel/Elevar/similar) Affiliate integrations To apply, send: 2–3 live Shopify stores you built, say which were custom from scratch vs fork/modification Your Lighthouse / Core Web Vitals scores on those stores One example of a complex custom section or commerce integration you wrote (subscriptions, custom cart logic, or tracking) Applications without store examples and performance numbers won't be considered.