Hi, I'm Yin.

A few technologies I have been working with recently.

• TypeScript

  Daily across Next.js, NestJS, and Apollo. Strict typing for shared models, generics for AI-pipeline abstractions, no `any` in shipped code.

• Next.js

  Production frontends with SSR / SSG / CSR trade-offs, deployed to Cloudflare Workers via OpenNext. Apollo Client + Zustand for state.

• NestJS

  Primary backend framework — modular DI, GraphQL code-first with Apollo Server, REST adapters, async queues, idempotent webhooks.

• React

  Component architecture, Apollo cache + Zustand state, design-system instincts, performance and accessibility-conscious UI.

• AI / LLM APIs

  Production integrations with OpenAI, Gemini (incl. Vision), Claude, and Perplexity Sonar. Structured outputs via JSON schema, prompt-injection defence, output sanitisation across locales.

• GraphQL / Apollo

  Apollo Server (NestJS code-first) + Apollo Client. GraphQL subscriptions for streaming AI pipeline status to the UI in real time.

• PostgreSQL / Prisma

  Schema modelling, migrations, query optimisation, indexing. Atomic `$transaction` for credit accounting and idempotent state changes.

• Google Cloud Platform

  Cloud Run for autoscaling containers, Cloud SQL for managed Postgres, Cloud Tasks for tier-aware async queues.

• Shopify Ecosystem

  Custom Shopify Apps end-to-end: Liquid theme work, App Bridge admin, Billing API for subscriptions, Admin API for catalog and middleware integrations.