Lee portrait

Hello! I'm Lee, a full-stack engineer who loves crafting software solutions that make a difference. I enjoy building intelligent, data-driven systems that elevate human experience and empower people to achieve more.

RAG-based chatbot powered by Groq, Llama, HuggingFace, Pinecone, Python, FastAPI, LangChain + LangSmith

Recent Projects

Project I worked on

Drove Measurable Gains in User Activation at Stash

Led the technical implementation of DAG-based onboarding experiments, partnering across product and design to achieve the largest percentage gains in activation to date.

  • PostgreSQL
  • GoLang
  • Node.js
  • Directed Acyclic Graph
  • A/B Test
  • TypeScript
  • React
  • Vite
  • Playwright
  • Figma
  • Mixpanel
Project I worked on

RAG-based chat app

I engineered a personalized AI assistant that enables recruiters to explore my qualifications. Go ahead and try it out in the footer👇

  • Python
  • FastAPI
  • RAG
  • Llama4
  • Groq Cloud
  • Pinecone
  • LangChain
  • LangSmith
  • Hugging Face transformers
Project I worked on

Sci-Guard: Saving science one word at a time with GenAI

I developed this free AI tool that scans grant proposals for banned words and rewrites sentences using OpenAI's GPT-4.1-mini.

  • Python
  • FastAPI
  • ntlk
  • spaCy
  • GPT-4.1-mini
  • OpenAI
  • Hugging Face
  • Docker
  • AWS
  • React
Project I worked on

Stash AI Money Coach

Brought award-winning AI-powered Money Coach to life on web. Fine-tuned GPT agents help consumers build healthy financial habits.

  • OpenAI
  • Python
  • FastAPI
  • HTTP Streaming
  • React
  • Vite
  • TypeScript
  • A/B Test
Project I worked on

Versatile Event Hubs

Developed a unified BFF API and UI to support event hubs for 25+ sports.

  • Node.js
  • Nest.js
  • BFF
  • SSR
  • A/B Test
  • Server Driven UI
  • Storybook
  • TypeScript
  • Jest
  • Cypress
Project I worked on

Athlete Profiles

Built full stack pipeline for ingesting & displaying sport data on expertly crafted athlete profiles.

  • TypeScript
  • SEO
  • Node.js
  • Nest.js
  • Firestore
  • NoSQL
  • Storybook
  • SSR
  • Redis
  • CDN
  • A/B Test
  • Jest
Project I worked on

Flight Tracker

Developed Flight Tracker, the most feature and data rich application for globally tracking and managing private jets.

  • Geological Mapping
  • MapBox
  • Geometry
  • Typescript
  • SaaS
  • Data Feeds
  • Map Projection

My skills

My experience

My articles

Contact me