Thang Viet To

Headless Shopify storefronts for a 300,000+ product publishing catalogue across two regions.

• Built the storefront on the Shopify Storefront API with Next.js, replacing theme-bound rendering.
• Ran catalogue and inventory operations through the Admin API at 300k-product scale.
• Kept Shopify checkout via the Buy Button SDK and made hand-off failures diagnosable.
• Instrumented the funnel with GA4, GTM and a Shopify Custom Pixel.
• Covered revenue-critical paths with Cypress E2E in CI.

Shopify · Storefront API · Admin API · Next.js · Cypress · GA4

Performance, reliability and integration work on a store peaking at 20–30 orders per minute.

• Profiled and relieved the order-write contention that limited peak throughput.
• Introduced Redis caching and session handling on the hottest paths.
• Built continuous, idempotent warehouse stock reconciliation.
• Shipped Luigi's Box AI search and event-driven marketing automation.

WooCommerce · PHP · Redis · MySQL · Cypress

Shipping-protection app with subscription billing, shipped natively to Shopify, Magento and BigCommerce.

• Designed a platform-agnostic core with thin per-platform adapters.
• Built the Shopify app properly: OAuth, session tokens, webhooks, embedded surfaces.
• Made webhook processing idempotent to eliminate duplicate-charge bugs.
• Handled subscription billing and per-order premium reconciliation.

Shopify App · Node.js · React · PostgreSQL · Payments

Affiliate platform with cross-domain attribution and an idempotent event-processing pipeline.

• Rebuilt attribution to work without third-party cookies.
• Achieved exactly-once accounting on an at-least-once event pipeline.
• Deployed containerised services to AWS ECS with Redis-backed hot lookups.

Node.js · Next.js · AWS ECS · Redis · Docker

Live streaming platform on AWS MediaLive and CloudFront with Redis-backed live state.

• Delivered adaptive-bitrate live video through MediaLive and CloudFront.
• Absorbed start-of-stream traffic spikes through CDN and cached state.

Next.js · Node.js · AWS MediaLive · CloudFront · Redis

Commerce and web application work across the JavaScript and PHP ecosystems — the foundation the Shopify specialisation was built on.

• Shipped production commerce features across multiple platforms and teams.
• Moved from general full stack work into deep commerce-platform specialisation.

JavaScript · React · Node.js · PHP · MySQL

Affitor — Distributed event processing · Affiliate platform

Exactly-once payout accounting on an at-least-once event pipeline, after third-party cookies died.

Order Protection — Multi-tenant SaaS · Subscription billing

A multi-tenant shipping-protection SaaS with subscription billing, installed natively across three commerce platforms from one core.

Simon & Schuster — Headless commerce · Publishing

A 300,000-product headless bookstore cut over live, across two regions, on one commerce backend.

Cost Price Supplements — Performance & reliability · High-traffic retail

Found the real bottleneck in the order-write path — not the catalogue cache everyone assumed.

ShowdownTV — Live video · AWS media services

Absorbing a start-of-stream traffic step, where viewer scale is a CDN problem rather than an origin one.