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joshuadefreitas/README.md
Two time rails showing observations, delayed availability, corrections, and an information cutoff

Joshua de Freitas

Developer tools, simulations, research systems, and whatever else seemed like a good idea at the time. 😈

Focus: Developer tools, Autonomous systems, Simulation, Quantitative research, Systems & security

What I build

Developer tools
Tools for seeing what coding agents and npm scripts are really up to.
Autonomous systems
Agents that do real work, plus a record of how they did it.
Simulation & GPU
Simulation and GPU compute that gives the same numbers every time.
Quantitative research
Point-in-time data, careful evaluation, and the occasional null result.
Research infrastructure
Claims written down before the data shows up, so a study can't quietly change its mind.
Systems & security
Seeing what install scripts actually do, and keeping local tooling locked down.

Current work

Some of the more interesting stuff is private, so you get what it does, not the code.

agentctl, private, v1, Python
Keeps tabs on coding agents: what ran, what finished, what got interrupted, and where to pick it back up.
71 tests · 22 live acceptance checks · 4 review rounds
parity, private, v0, Rust · wgpu
Checks that the same computation gives the same answer on different hardware. Harder than it sounds.
2 fixtures · equivalence criteria locked in before any backend evidence
trace-npm, public, alpha, npm · Linux
Shows what npm install scripts actually touch, spawn, and call. Good to know before you run one.
Published on npm · strace-based runtime trace
Sekiya, public, institute, Python · JavaScript
My independent institute. Empirical research on how autonomous agents behave, and technology for understanding difficult systems.
7 public studies

More public work

  • neural-field-study JavaScript — A deterministic neural-field model you can replay live in the browser.
  • deep-lob Python — A synthetic order-book study of when overlapping windows make a model look smarter than it is.
  • release-equivalence Python — When is a new model release actually the same one? Identity, equivalence, rollback.
  • clock-dataset Python — Point-in-time vs latest data, and how much hindsight sneaks into historical decisions.
  • time-series-experiments Python — Forecasting experiments across volatility, regimes, structural breaks and chaos.

Tools

Tools: Python, Rust, TypeScript, Node.js, WebGPU, Vulkan, Linux, GitHub Actions

Website · LinkedIn · Sekiya · npm

Popular repositories Loading

  1. joshuadefreitas.github.io joshuadefreitas.github.io Public

    Personal site for Joshua de Freitas, a data engineer at EY.

    HTML 1

  2. neural-field-study neural-field-study Public

    A deterministic computational neuroscience field study.

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  3. Forecasting-Remittances Forecasting-Remittances Public archive

    This repository showcases my work on forecasting remittances

  4. time-series-experiments time-series-experiments Public

    Reproducible forecasting experiments across volatility, regimes, structural breaks, chaos, and multivariate dynamics.

    Python

  5. dbx-core dbx-core Public archive

    A minimal, notebook-free Databricks project built around Python packages, local development, and remote execution.

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  6. joshuadefreitas joshuadefreitas Public

    GitHub profile for Joshua de Freitas

    JavaScript