Jean Manzo
Full-stack developer with 10+ years of experience, specializing in Shopify apps and themes that boost sales, automate operations, and keep merchants happy.
Currently working with Vaangroup — a Shopify Plus agency.
Selected work
All →- Zone Details form for Nuflorist — Phase-driven, AI-assisted build of a complex delivery-zone form inside an existing Remix-based Shopify app — covering ZIP validation, draft/publish states, duplication, and pricing overrides.2025
- Modern Shopify Theme App Extension (Preact + Volt + TypeScript) — Migrated Nuflorist's cart widget from Liquid + vanilla JS to a Preact + Volt + TypeScript theme app extension — ~80% smaller bundle, sub-500ms hot reloads, and better Lighthouse scores.2025
- A/B testing with videos without killing performance — Implementation patterns for video-based A/B tests on Shopify storefronts — lazy loading via IntersectionObserver, multi-format sources, and muted autoplay strategies that protect Core Web Vitals.2024
- Reworked 'Complete Your Set' for a Shopify CRO experiment — Rebuilt a Shopify product-recommendation feature using web components and a custom metafield-driven upsell list — A/B tested against the original and lifted average order value.2024