Service Ops
Live on the Shopify App StoreTurns Shopify into a full service-management system: tickets from intake through delivery, deposits taken through Shopify checkout, and a shareable status link so customers stop phoning to ask.
Full-Stack Engineer · Can Tho, Vietnam
Khoi
Nguyen
I build production systems end to end: AI agents and automations, APIs and data models, cloud infrastructure, and the React interfaces that bring them together.
Full-stack, in production
AI agents & automation
Services & APIs
Data & infrastructure
Product interfaces
01 — Experience
Five years of shipping products end to end.
Backend services, AI agents, data models, React interfaces, and production releases. From PHP-to-Node migrations and medical platforms to three apps built on Cloudflare at my own studio.
Built and shipped three Shopify apps, including a production AI agent with the Vercel AI SDK.
- Founded and run a technical studio solo, taking Service Ops, Team Up and Thynk from product idea to live on the Shopify App Store. Own the architecture, React interfaces, Shopify integrations, billing, deployment, and support.
- Built Thynk's multi-provider agent with Vercel AI SDK tool calling, MCP and Composio connectors, store-specific context, semantic memory, and scheduled or event-driven automations.
- Designed checkpointed agent execution in Durable Objects, streaming chat across the web, Slack and Telegram, model failover, context-window budgets, and usage tracking.
- Built business workflows for service tickets, deposits, customer status pages, and group ordering. Use Workers, D1/Drizzle, R2, Queues and Cron Triggers for the backend and data layer.
- Added automated tests and agent evaluation scenarios for tool selection, context handling, failure recovery, and tenant isolation; maintain CI/CD and production troubleshooting.
TypeScriptReactVercel AI SDKCloudflare WorkersDurable ObjectsD1React RouterShopify APIsMCPQueuesScentiment
Shopify DeveloperFour storefronts, one engineer, 99/100 on PageSpeed.
- Own theme development, Shopify Plus configuration, custom apps, and production fixes across four stores, balancing daily merchandising changes with longer-term engineering work.
- Rebuilt the theme architecture and took Google PageSpeed to 99/100, retaining that performance through subsequent feature releases.
- Build and maintain custom Shopify apps with Remix and React, server-side application routes, third-party integrations, and PostgreSQL-backed data flows.
- Upgrade the legacy codebase incrementally while stores remain active, keeping storefront changes and application maintenance moving in parallel.
Shopify PlusLiquidRemixReactTypeScriptPostgreSQLCustom AppsMeowCart
Led the migration that moved the product off PHP.
- Led an incremental migration of the Shopify app platform from PHP to Node.js without downtime, preserving existing merchant workflows during the transition.
- Built full-stack Shopify app features with TypeScript, React, Node.js and Express, connecting interfaces to backend services and GraphQL integrations.
- Maintained MongoDB and Firebase data flows and refactored legacy modules to make the new backend easier to extend and troubleshoot.
TypeScriptNodeExpressReactGraphQLMongoDBFirebaseMigrated a portfolio of Shopify apps off Liquid and PHP onto Remix, concurrently with MeowCart.
- Migrated multiple Shopify apps from Liquid and PHP to Remix, replacing legacy rendering with React interfaces and Node.js-backed routes.
- Delivered the migrations one app at a time while preserving existing merchant functionality; handled interface changes and backend work together.
- Worked remotely across several concurrent app migrations for the same client, alongside the MeowCart engagement.
RemixTypeScriptReactNodeLiquidPHPShopifyb13.ai
Delivered Android, iOS and web features from a single Bubble.io application.
- Built cross-platform features on a shared no-code application, keeping web and mobile behaviour in the same codebase.
- Refactored the core bottleneck module to make the application easier to maintain and extend.
Ausgezeichnet.org — NFQ
Built a Symfony and MongoDB review platform, with Google Reviews integration and automated delivery.
- Built and maintained a ratings and review platform with PHP/Symfony, Doctrine-backed MongoDB models, and Google Reviews integration.
- Worked directly with the Product Owner to turn business ideas into features, clarify technical constraints, and make scope and implementation decisions.
- Redesigned the site with Twig and Bootstrap and refactored accumulated technical debt alongside ongoing product development.
- Introduced Docker and automated GitHub Actions CI/CD to make builds and production releases repeatable.
PHPSymfonyMongoDBDoctrineTwigBootstrapDockerGitHub ActionsReal-estate platform
Owned a Laravel application for property listings and news articles, from interface to deployment.
- Built the listing and editorial features across frontend views, Laravel backend logic, and MariaDB data models through Eloquent.
- Handled the application deployment as part of the same engagement rather than handing off an unfinished codebase.
Physiotherapy medical SPA
Built a medical-records SPA for patients undergoing physiotherapy and restorative treatment.
- Connected React screens to Node.js and Express services backed by MongoDB for medical-record tracking.
- Redesigned the interface with Tailwind CSS around the clinical workflow, making record state and treatment progress easier to follow.
Medical tracking platform
Built a stroke-patient platform for doctors and patients across the frontend, backend, and delivery pipeline.
- Translated the client's product concept into technical solutions and advised on scope and implementation choices.
- Built Node.js/Express services, GraphQL APIs with Apollo, MongoDB data models, and React/Redux interfaces.
- Redesigned the site and set up Jenkins CI/CD to automate application delivery.
Education
Engineering degree
Storefront performance
99/100
02 — My startup
vzlab — engineering products that solve real problems.
A technical studio building commerce software and AI-powered operations tools. I look for the manual workflow — the spreadsheet, the group chat, the sticky note on the counter — and replace it with something reliable and polished on modern cloud infrastructure.
Team Up
Live on the Shopify App StoreGroup ordering for decorated-apparel businesses. The organiser shares one link, each participant picks their own size and design, and the shop gets a single consolidated invoice plus production sheets generated for them.
Thynk
Live on the Shopify App StoreAn AI operations manager for Shopify. Ask it about live store data, hand it a task, or schedule a workflow — and reach it from the Shopify admin, Slack, or Telegram.
TypeScriptReactCloudflare WorkersDurable ObjectsD1R2Shopify Admin APIVercel AI SDKMCPQueues / Cron
03 — Selected work
Six builds, and what each one actually solved.
Commerce workflows, AI operations, and clinical software — with the services, data, interfaces, and delivery decisions that make them work.
04 — Stack
From the database to the interface.
AI systems
Vercel AI SDKAI agentsTool callingStructured outputsMCPPrompt designContext managementAI evaluation
Backend & APIs
TypeScriptNode.jsExpressPHPSymfonyLaravelGraphQL / ApolloShopify Admin & Storefront APIsREST APIs
Databases & modelling
MongoDBMySQL / MariaDBSQLite / D1DrizzleDoctrine
Cloud & delivery
Cloudflare WorkersDurable ObjectsR2Workers AIQueues / Cron TriggersDockerLinuxGitHub ActionsJenkins
Frontend
ReactReact Router / RemixNext.jsReduxTailwind CSSSCSSShopify Liquid
Engineering practice
TestingAgent evalsObservabilityOOP & design patternsProduction debuggingLegacy migrationsScrum / Kanban / Jira
05 — Contact
Open to work worth doing.
Five years building across the stack: AI agents with the Vercel AI SDK, Node.js and PHP services, GraphQL integrations, SQL and MongoDB data models, and React interfaces. I’ve migrated live app platforms, set up CI/CD pipelines, and founded vzlab to ship three Shopify apps on Cloudflare. I own the work from product decisions and backend architecture through deployment, testing, and the user experience.
- GitHub
- khoinguyen12200
- Based in
- Can Tho, Vietnam