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ashbybrewer/README.md

William Brewer · Nashville, TN

I build interactive data instruments and production-grade data systems — from a real-time 3D satellite tracker to a maritime-intelligence platform to an ETL pipeline that underwrites real estate. Economics background, real-world operator, self-directed engineer. I care about two things: shipping something that actually runs, and never blurring the line between what's sourced and what's modeled.

🛠 Production & systems work — the "can you ship?" pile

Project What it is Live
Orbital Viz Real-time 3D satellite & orbital-debris tracker — SGP4 propagation, Three.js/WebGL point cloud, live TLE ingestion. Runs with zero install. ▶ launch
Poseidon Maritime Maritime-intelligence platform — live AIS vessel tracking, spatial analytics, LLM-driven anomaly detection (dark ships, route deviation). ▶ launch
RealtyETL Production ETL + BI for property profitability — DuckDB warehouse, Prefect orchestration, Streamlit dashboard, 38-test suite. Real-world underwriting tool. repo
Ghost Signals A receive-only WebSDR console for shortwave audio archaeology — world receiver map, tuning console, recording, bookmarks. repo

🗺 Interactive history at scale — the "design + data rigor" pile

Project What it is Live
The War Room Atlas Eighteen self-contained interactive instruments for reading power — empires, wars, migrations, cities — each a scrubbable century. One build pipeline, one design language. ▶ dispatch board
Nashville Time Machine A historical atlas of Nashville 1900–2026 — decade slider, ghost-street overlays, demographic dot-density, opportunity forecasting. ▶ launch
The Peopling of America Every U.S. census 1790–2020 as a county dot-atlas — three thousand counties, one dot at a time. ▶ launch
The Great Migration Six million northbound, 1910–1970, as a living dot field drawn from state-level census series. ▶ launch

🤖 Machine learning, from the metal up

Project What it is
minigpt A decoder-only Transformer in ~300 readable lines of raw PyTorch — every moving part visible, zero borrowed weights.
cumberland A local-LLM lab: from-scratch BPE tokenizer, pretraining loop, SFT persona shaping, and an agent harness.
Recidivism, revisited NIJ Recidivism Forecasting Challenge model + a 2026 re-analysis showing re-offending concentrates in a persistent cohort.

How I work: Most of these ship as a single self-contained index.html — React and data inlined, no servers, no keys, open it anywhere and it runs forever. Every figure on the board is labeled SOURCED (archival/census-derived) or MODELED (constructed/interpolated/forecast). The line is never blurred.

Designed and directed by me; built in collaboration with AI. The research direction, architecture, historical judgment, error-catching, and product decisions are the human contribution — and the framing always says so, because that honesty is the point.

📍 Nashville, TN · 📧 ashbybrewer@gmail.com

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  1. nashville-time-machine nashville-time-machine Public

    Interactive Nashville neighborhood intelligence map with historical shifts, future scenarios, opportunity rankings, and address-level research nodes.

    HTML 1

  2. credit-risk-classification credit-risk-classification Public

    Logistic regression on imbalanced lending data — why recall on the risky class is the metric that matters

    Jupyter Notebook

  3. cumberland cumberland Public

    A local-LLM lab: from-scratch BPE tokenizer, pretraining, SFT persona shaping, and an agent harness — built to run on an aging iMac.

    Python

  4. Home_Sales Home_Sales Public

    Home sales analytics in SparkSQL — temp views, caching, and parquet partition benchmarking

    Jupyter Notebook

  5. minigpt minigpt Public

    A language model from scratch in ~300 readable lines — decoder-only Transformer, raw PyTorch, every moving part visible.

    Python 1

  6. the-great-inversion the-great-inversion Public

    How air conditioning picked up the American population and moved it south, 1900–2025. Interactive single-file visualization.

    HTML