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EddieSun
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© 2026 Eddie

About.

Currently leading signal evaluation at a fintech.

Fields I find fascinating are decision theory, epistemology, and cosmology. My favourite authors are Deutsch, Isaacson, and Feynman (cliché).

I studied Systems Design EngineeringSystems Design EngineeringA co-op program combining software, mechanical and electrical engineering with design and human factors.x∗=argx∈Fmin​E[C(x,ξ)]x* equals argmin over x in F of the expected value of C of x and xi.Coursework ranged from modelling and optimization to statistics, pattern recognition and scheduling.See an example class profile at uWaterloo.

01Writing

All writing
  1. FEB 12 2025

    Stablecoins

    An interactive essay on stablecoins, payment rails, monetary history, market structure, and the risks of dollar-denominated crypto money.

  2. OCT 20 2024

    Direct Atomics: A Post-Mortem

    Direct Atomics built an equivariant GNN to accelerate DFT, reducing simulation time from months to minutes. Challenges included niche markets, resistance to drag-and-drop tools, and in-house/open-source competition.

02Built

  1. Direct AtomicsDirect AtomicsWe trained a 13.8M parameter equivariant eSCN model on Alexandria's DFT data to estimate energies and forces from atomic structures.Screening materials faster wasn't enough. Semiconductor customers had billions invested in making their existing materials work. Read the post-mortem here.Comparison chart: traditional DFT scales O(n^3) and costs HPC hours-to-months for hundreds-to-thousands of atoms, while the neural network surrogate scales O(n) and runs in sub-second GPU time on a single GPU
    Neural networks for atomic energies and forces
    Post-mortem
  2. Modern RelayModern RelayAn agent works out how to find something in the company's data. Save that query so the next agent doesn't have to work it out again. Agents can propose changes to the data model too. New facts go onto branches for review, so mistakes can be discarded before they reach the shared graph. The company owns the data and its definition.
    Reusable queries and reviewed changes to company data
    Raised $3M
  3. λ eignλ eignWe tracked what chatbots said about brands, then worked on making their sites easier to read and cite.Wound it down as tracking tools became interchangeable and Cloudflare moved into markdown for agents.Domain rank distribution chart for thenetworkstate.com showing how often the domain is cited across GPT, Perplexity, and Claude responses, alongside example AI-cited sources
    Helping websites show up in chatbot answers
    Wound down

03Worked

  1. CloudflareCloudflareBERT-based clustering for high-volume internal support tickets.Pivoted from topic clustering to finding similar historical tickets for technical support engineers.Result: 95% of tickets had useful similarities; about 50% of tickets were resolved 80% faster.BERTUMAPHDBSCANc-TF-IDFMMREmbedClusterLabel
    Finding similar past tickets for support engineers
    Early 2022
  2. Protocol LabsA legal assistant that answers questions from PDFs. Extract the text, split it into chunks, embed them, then retrieve passages for the model to use.Explored GPT-4 and local models.
    Answering questions from legal PDFs
    Early 2023
  3. Internships
    Product/design/swe
    • BlackBerry QNX with AWS
    • Wind River Studio for cloud-native embedded systems
    • Mount Sinai cytopathology

04Believe

  1. Mouth closed, don't get fed.
  2. Desperation never served anybody. Suffering is a choice.
  3. Life is too short to play zero-sum games (e.g. status).
  4. Kindness isn't niceness. Signaling virtue is a vice.
  5. Character is grace when the chips are down.
  6. Grit is a superpower, but so is quitting.
  7. Be a hyperrealisthyperrealistAppreciate every reality, even the harsh ones. Despise impractical idealism.Dreams matter, but the people who build great things aren't idle dreamers. They're grounded in reality, understand cause and effect, and use principles to get what they want.. Dreams + Reality + Determination = A Successful Life.

This is the latest snapshot of my personality archetype.

  • Writing
  • Built
  • Worked
  • Believe