Chris Song

Chris Song

AI-Powered MVP Builder for Startups | Web & Mobile: React · Next.js · React Native · FastAPI · LangChain | Ex-Pactera & DHC

Dalian, China

Contact info
💼 Self-Employed
🎓 Dalian University of Technology

About

I build AI-powered products for startups — web apps, mobile apps (React Native), or both. You bring the idea, I deliver the full cross-platform product.

DHC Software and Pactera — shipping production systems for enterprise clients since 2016. Now I apply that reliability to startups — fast delivery, production-quality code.

RECENT WORK

  • AI writing SaaS: Next.js + FastAPI + OpenAI API + Stripe. Wireframe to paying users in 5 weeks.
  • Cross-platform fitness app: React Native (iOS + Android), AI workout recommendations. Both app stores, 6 weeks.
  • RAG knowledge base: Document upload, hybrid search, React chat UI. Pinecone + LangChain. Support team 3x faster.
  • Crypto portfolio tracker: React Native + Solidity smart contracts + real-time feeds.
  • Workflow automation: LangChain agents replacing 20hrs/week of manual data entry.

WHAT I BUILD

  • AI SaaS MVPs — idea to deployed product with auth, billing, analytics
  • Cross-platform mobile — React Native (iOS + Android), one codebase
  • RAG systems — chatbots, knowledge bases, document Q&A
  • Web + Mobile bundles — launch both together, shared backend
  • AI automation — LangChain agents for workflow automation

STACK

React · Next.js · React Native · Expo · TypeScript · FastAPI · Node.js · PostgreSQL · Pinecone · LangChain · OpenAI API · Claude API · Stripe · Solidity · Rust/WASM · Docker

985 university (DUT). Async-first workflow — I deliver on schedule regardless of where your team is located.

Have a startup idea that needs building? Send me a message — I'll tell you what it takes to ship it.

Top skills: React Native · LangChain · FastAPI · Next.js · OpenAI API

Experience

💼

Full-Stack AI Developer & MVP Builder

Self-Employed · Freelance

Jul 2023 – Present · 2 yrs

  • AI writing SaaS — live in 5 weeks
  • Cross-platform fitness app — 6 weeks
  • RAG knowledge base — support 3x faster
  • Workflow automation — saved ~20 hrs/week
  • Crypto portfolio tracker — React Native + Solidity
🏢

Full-Stack Developer & Blockchain Engineer

Pactera (文思海辉) · Contract

Jul 2019 – Jun 2023 · 4 yrs

  • React + Next.js, FastAPI, Node.js, PostgreSQL
  • Solidity smart contracts + Chainlink oracles
  • Rust/WASM — processing 5s → <1s
  • Docker + Kubernetes microservices
🏢

Full-Stack Developer

DHC Software (华信) · Full-time

Jul 2016 – Jun 2019 · 3 yrs

  • Web apps for Japan/US clients
  • E-commerce, dashboards, reporting
🎓

B.Eng. Software Engineering

Dalian University of Technology · 985/211

2012 – 2016

Featured Projects

AI Writing Assistant

AI Writing Assistant SaaS

Next.js + FastAPI + OpenAI API + Stripe. Wireframe to paying users in 5 weeks.

Next.jsFastAPIOpenAIStripe
RAG Knowledge Base

RAG Knowledge Base

Hybrid search, Pinecone + LangChain. Support team 3x faster.

LangChainPineconeFastAPIReact
Fitness App

Cross-Platform Fitness App

React Native + Expo. Both app stores, 6 weeks.

React NativeExpoFastAPI
Admin Dashboard

Admin Dashboard & Analytics

RBAC, Stripe revenue tracking, automated reports.

Next.jsFastAPIStripe
Crypto Tracker

Crypto Portfolio Tracker

React Native + Solidity + WebSocket real-time.

React NativeSolidityWebSocket
AI Support Bot

AI Customer Support Bot

RAG + auto-answers + human handoff + analytics.

LangChainPineconeWebSocket

Skills

AI / ML

LangChainLangGraphCrewAIOpenAI APIClaude APIRAGPinecone

Frontend

ReactNext.jsTypeScriptTailwind CSSVue.js

Mobile

React NativeExpoiOS + Android

Backend

FastAPINode.jsExpress.jsDjangoPython

Blockchain

SolidityHardhatEthers.jsChainlinkRust/WASM

Infrastructure

DockerKubernetesPostgreSQLRedisMongoDBCI/CD

Profile language

Public profile & URL

qingyusong94.github.io

Overview

Experience10 yrs
AI Focus3 yrs