Personal details
Nazmul H.
About
Senior Full-Stack & Shopify Engineer | 6+ Years Experience
Dedicated Shopify & Shopify Plus Developer specializing in custom theme development, Shopify App architecture, headless/API integrations, and frontend performance optimization.
Key Technical Highlights:
- Shipped 4 Public Shopify Apps through Shopify's App Store review process (handling OAuth, GDPR compliance, webhooks, App Bridge, Polaris, React, Node.js/Remix, and PostgreSQL).
- Shopify Plus & Extensibility: Experienced with Shopify Functions (discounts, shipping, payment logic), Checkout Extensibility, Flow automations, and B2B/Markets implementations.
- Performance Engineering: Core Web Vitals optimization (Lighthouse 38 → 92 overhauls), liquid cleanups, JS bundle reduction, and cutting backend API response times (e.g., OMS API 4s → 400ms).
- Custom Storefronts & Integrations: Modern Liquid / OS 2.0 themes built pixel-perfect from Figma, REST/GraphQL API integrations (ERP, CRM, OMS), and zero-downtime migrations (WooCommerce/Wix to Shopify).
Core Tech Stack: JavaScript, TypeScript, React, Remix, Node.js, GraphQL, Liquid, Tailwind CSS, PostgreSQL, Shopify Admin/Storefront APIs.
Work Experience
Freelance Shopify developer with 6+ years of focused, dedicated experience across the platform — no other CMS or e-commerce framework. Top Rated on Upwork with a 100% Job Success Score.
Shipped 4 apps through Shopify's App Store review process (OAuth, billing, GDPR compliance, App Bridge) — a level of technical depth most Shopify freelancers never reach. Core work spans custom app development, Shopify Plus theme development, speed optimization, landing pages, and CRO.
Selected results:
Took a client's mobile Lighthouse score from 38 to 92 through a full performance overhaul Cut an external OMS API response time from 4 seconds to 400ms
Built a full print-on-demand platform from scratch, competing with Printful/Printify
Migrated and fixed a broken Shopify Markets setup with zero downtime, recovering £3,253 in sales on cutover day
Clients range from DTC startups to established brands with 30+ years in their industry, spanning nutrition, fitness, fashion, and CBD/wellness verticals.