Hao Yan

Currently

• Founding Engineer @ TraceRoot.AI ( YC S25) — building infrastructure that lets AI agents debug and fix themselves

  Sep 2026 – NowSan Francisco, CA

  prev. Software Engineer Intern

  May – Aug 2026

• Co-Founder @ ML³ Labs — when late means wrong

  Nov 2025 – Now

• Embedded Systems & Controls Software Lead @ McMaster Exoskeleton — 500 Hz IMU acquisition and a distributed CAN network for a powered exoskeleton

  Sep 2026 – NowHamilton, ON

  prev. Embedded Systems Software Engineer

  Oct 2025 – Sep 2026

• AI/ML @ McMaster EcoCAR — model-based controls, diagnostics and perception for an autonomous EV

  Nov 2025 – Now

• Software Engineering @ McMaster University

  2025 – 2029

Previously

• Autonomous & Mechanical Engineer @ VEX Robotics Team 3388N — 6th of 200 teams at Canada's largest VEX tournament; built the full autonomous nav stack in C/C++

  2022 – 2025Calgary, AB

• Robotics Coach @ Western Mechatronics

• Diploma Programme @ International Baccalaureate

  2022 – 2025

Projects

• Preview · Drew onDiagrams

  A preview of Lumen's Drew on line, still being built. For one reply, Claude Code had 41 items in its context, 22,310 tokens in all, drawn as a map of tiles as wide as their tokens: its instructions on how to work, its tools, CLAUDE.md, your 4 earlier messages and this one, and its own work, the files it read, the commands it ran and its replies. You asked: why does the retry test time out? backoff should be in seconds. It opened src/retry.ts and ran pnpm test, then replied: As you said, backoff should be in seconds. backoff() returns milliseconds, so each retry waits 1000× too long. Under the reply, Lumen shows what it drew on: Opened retry.ts, Ran pnpm test, Quotes your message. It drew on 3 items and didn't draw on the other 38, which the map hatches.

  Had 0 items · 0 tokens · drew on 3 · didn't draw on 38

  How to work≈7.0kBash, Read and 14 more≈5.0kIts replies and 12 results≈5.6k4 earlier messages≈1.5kYour message≈30Your messageQuotesCLAUDE.md≈1.2kretry.ts≈1.2kretry.tsOpenedpnpm test≈0.8kpnpm testRan

  › why does the retry test time out? backoff should be in seconds

  As you said, backoff should be in seconds. backoff() returns milliseconds, so each retry waits 1000× too long.

  Drew on Opened retry.ts · Ran pnpm test · Quotes your message

  LumenSee what your agent sees

  Agents answer from context you never get to see. Lumen shows it, reply by reply: the files, commands and messages each answer drew on, and what got cut when the context ran out. So when an agent goes wrong, you can see why. It works with local models, your own API keys, Claude Code and Codex.

  GitHub: dark-sorceror/Lumen
• Winner · Hack the North 20261 / 9GoosetrieverVoice-controlled assistive robot that fetches dropped itemsGitHub: dark-sorceror/Goosetriever
• 1 / 6NeurineseGrammarly and Copilot for handwritten ChineseGitHub: dark-sorceror/Neurinese