Ming Jer Lee

About Me

My experiences span various domains, including applying LLMs to improve data/ML pipeline reliability, applying first-principle physics constraints to planning petrochemical plant construction, developing hedging strategies for insurance products for a publicly traded company, and debugging data quality issues within hundreds of billions of records for a hedge fund.

Currently focused on orchestrating AI agents to build a production SaaS platform.

Quick Facts

🏢 Staff Software Engineer at Grassroots Analytics
🎓 Ph.D in Physics, University of Maryland
📍 Based in Washington DC
🌐 Available for remote collaboration

View full experience on LinkedIn

Projects

Featured Project

Math Math Math

Practice Everyday Math In a Fun Way

A platform with hundreds of everyday mental-math games across arithmetic, finance, sports, everyday scenarios, and more. Features real-time multiplayer challenges and solo modes for skill-building, with both exact-answer and estimation-based games. All typed input, no multiple choice, not LLM-cheatable.

Mental MathEveryday MathMultiplayerReal-timeNext.js

Visit mathmathmath.net

Math Math Math tip calculator game in Expert mode

Data Tools

clgraph

Column Lineage Graph for SQL

A Python library that extracts column-level lineage from SQL queries through static analysis. Understands which source columns feed into each output column — without executing queries or connecting to databases.

PythonSQLData LineageStatic AnalysisOpen Source

Visit clgraph.dev

Data Engineering

Modern Data Platform

End-to-end streaming & batch data pipeline

A production-style data platform demonstrating modern data engineering practices. Combines real-time streaming and batch processing to ingest, transform, and analyze data from multiple SaaS sources (Shopify, Stripe, HubSpot) with cross-source entity resolution across a multi-layer pipeline (Raw → Staging → Semantic → Analytics → Marts).

Apache IcebergFlinkSparkRedpandaTrinoClickHouseAirflowGrafana

View on GitHub

Modern data platform architecture diagram

Fun Project

Brick Text Builder

3D LEGO-style text generator

An interactive 3D brick text builder using Three.js. Type any text and watch it come to life as colorful interlocking bricks with realistic construction sequence. Try it out live — type your name and see it built brick by brick!

ReactThree.js3D GraphicsInteractive

Try It Out

Brick Text Builder showing MINGJER in colorful 3D bricks

Fun Project

Brick Text Builder TUI

Terminal brick text with animations

A Rust terminal app that transforms text into ASCII art using brick-like blocks with Unicode box-drawing characters, featuring brick-drop physics and marquee scrolling.

RustRatatuiTerminal UIAnimation

View on GitHub

Brick Text Builder TUI build animation in terminal

Blog

I write about SQL best practices, data engineering, and column lineage on the clgraph blog.

Visit the Blog

Let's Connect

I'm always interested in discussing new opportunities, collaborating on projects, or just chatting about data engineering. Feel free to reach out!

info@mingjerlee.com LinkedIn GitHub