Hi, I'm johnsxiongs 👋

📍 Shenzhen, China | 🐍 Python | 🤖 Agentic AI | 🌐 Full-Stack (Web + iOS)

I build AI-native, production-ready products: FastAPI + LangGraph/LangChain on the backend, Vue 3 on the frontend, and SwiftUI on iOS—shipped with Docker/Compose and Traefik.

Current Focus / 当前关注

• 🤖 Agentic AI: LangGraph workflows, tool calling, tracing & evaluation (LangSmith)
• 🧱 Backend: FastAPI, SQLModel/SQLAlchemy, PostgreSQL / TimescaleDB, Redis (streams)
• 🖥️ Frontend: Vue 3 + TypeScript + Vite, Pinia, Naive UI, Tailwind CSS
• 📱 iOS: Swift + SwiftUI, MVVM, RevenueCat
• 🚀 Delivery: Docker Compose, Traefik, TLS-ready reverse proxy setup

Tech Stack (Snapshot)

Backend

• Python, FastAPI, Uvicorn/Gunicorn
• SQLAlchemy 2 / SQLModel, Pydantic v2
• PostgreSQL / TimescaleDB, Redis (cache + streams)
• Supabase Auth (JWT), bcrypt

Agent Stack

• LangGraph, LangChain, LangSmith (tracing/eval)
• OpenAI / Anthropic / OpenRouter (and other providers)
• Durable checkpointing (PostgreSQL) + worker queue (Redis Streams)

Frontend

• Vue 3, TypeScript (strict), Vite
• Pinia, Vue Router, Vue I18n
• Naive UI, Tailwind CSS

iOS

• Swift, SwiftUI, MVVM
• RevenueCat (subscriptions)

Infra

• Docker / Compose, Traefik (reverse proxy + TLS)
• Nginx (optional), Cloudflare (DNS/TLS automation setups)

What I Ship / 我擅长交付

• AI Agent Platform — LangGraph/LangChain workflows, queue-based execution, SSE streaming output, tracing/eval
• Data Pipelines — real-time ingestion (REST/WS) → stream processing → time-series storage
• Product & Growth Infra — auth + billing + subscriptions (Supabase/Stripe/RevenueCat), iOS + Web clients kept in sync
• Product Engineering — typed models, structured logging, testable services, dockerized delivery

GitHub

• Profile: https://github.com/johnsxiongs

Connect

More

• 💬 Ask me about FastAPI, LangGraph/LangChain, PostgreSQL/TimescaleDB, Redis, Vue 3, SwiftUI
• 🧪 I care about reliability: typed models, structured logging, and testable services