Notebook · p. 1 · 2026field notes, not a demo

Yupeng Lu

Diamond Bar, California (PT)

F = ma→dS = μS dt + σS dW→agent systems

AI agent & backend engineer — I build agent workflows and the backend systems that run them.

Contact

Open to part-time / contract · ~20 h/week · no sponsorship needed

Fig. 1 — a double pendulum and a pale twin that starts Δθ₂ away. Drag a bob to set the release. Reset clears both trails; Re-run replays the twin experiment from the marked release. Fig. 1 — double pendulum drag a bob
0.015
Plate № 01 Beijing — Endless Second Ring Watch

Plate № 01 · 48 s loopmy hometown, imagined

Beijing — Endless Second Ring

Watch the film
§1 · Lab entries

Selected Work

each one measured, not just demoed

01 AI execution · 02 Infra platforms · 03 Ops reliability

  1. Exp. 01 · live system · 2026AWS

    Live trading execution

    One host, one writer — fill-dedupe keys, startup reconcile, bracket orders, an after-close watchdog. The technical sheet prints the order path and one measured regression, with its method.

    Open the live dashboard ↗ Read technical sheet № 01 →

  2. Exp. 02 · WebGL filmThree.js · CI gates

    Beijing — Endless Second Ring

    48 s deterministic drive · 12 passages · performance gates

    Watch the film →

  3. Exp. 03 · open research · monthly10 models · 8 labs

    Agent Stack Index

    What AI coding models pick when they start a project from scratch · 29 categories · 2,670 answers · open data

    Read the index ↗ data & code ↗

  4. Exp. 04 · public skill · MITCookiy AI

    user-research-skill

    1.5k+ GitHub stars · the open-source skill that gives Claude, Codex, Cursor and OpenClaw end-to-end user research

    user-research-skill on GitHub ↗ cookiy-cli ↗

  5. Exp. 05 · AI usage yearbookpublic data · auto-published

    The Compute Ledger

    Daily tokens, cache reuse, estimated costs, model history and source freshness — a durable multi-machine record of how I use AI coding tools.

    Open the ledger ↗ source & methodology ↗

  6. Exp. 06 · private · Baidu MeDonot public

    Agent platform & revenue backend

    █,███,███ ledger entries reconciled in the overseas billing migration

    Details in the resume →

Also: full programme → · resume (PDF)

§2 · Derivation

About

I build agent workflows and backend systems in TypeScript, Python, and Java. My work spans tool use, streaming execution, real-time voice, billing, and production troubleshooting. I also co-develop a live trading system on AWS.

  • NowSoftware engineer · Baidu (MeDo)
  • BeforeAI agent engineer · Cookiy AI
  • EducationBU M.S. Mathematical Finance (Jan 2023) · Ohio State B.A. Physics
  • BasedDiamond Bar, California (PT) · US permanent resident

dS = μS dt + σS dW

Fig. 2 — the finance floor, made to move

μ · drift, the slow tilt σ · volatility, the size of the luck dW · the dice, drawn fresh every step

① noiseevery step, the bell hands each future its own draw

② the pricetakes that draw as one step — up or down

③ nine futuresthe red line is what the model expects, the band is how unsure it is

④ the same futures, one ruleout at −15%, and out for the year — the pale stretches are the days you sit out

⑤ the difference999 futures, both ways through them

the rule can’t predict tomorrow — it chooses how to live through it

§3 · Contact

Exp. 07 — your project

I work on agent tool use, streaming and real-time backends, billing systems, and the tests and operational checks that keep them reliable.

Email me yplmicro@gmail.com

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