Nguyen T.

I’m a Senior Full-Stack JavaScript developer with 8+ years of experience building Shopify apps, SaaS products, and AI-powered web applications. My core stack includes TypeScript, React, Next.js, Node.js, Shopify APIs, GraphQL, MongoDB, and MySQL. I’ve worked on real-world Shopify products across the full lifecycle from architecture and feature development to billing, data workflows, debugging, and production maintenance. Some areas I specialize in include: - Shopify app development and Shopify Admin API - Shopify Billing API, subscriptions, and usage-based billing - Migrating apps from Stripe to Shopify Billing - AI-powered product and content generation - Data-heavy applications, scraping, and automation - Legacy codebases and production troubleshooting - SaaS architecture and long-term maintainability I also have hands-on experience dealing with Shopify policy and compliance issues. This means I don’t just implement billing or app features. I consider how the implementation affects merchants, revenue, app approval, and the long-term sustainability of the product. I look beyond individual tickets and consider the bigger picture: architecture, business requirements, billing logic, merchant experience, and maintainability. I’m particularly comfortable working with: - Complex or legacy codebases - Early-stage SaaS products - Shopify apps with non-trivial billing and data workflows - Founders who need both implementation and technical direction If you need a senior developer who can take ownership of a product rather than simply complete assigned tasks, I can help.