Juan Castro

Field notes / current state

Now

A working view of what has my attention.

A snapshot of what I'm building, learning, and exploring right now.

Employed · Full-Time

01 / Recent project activity

Recently active

Projects ordered by their latest GitHub activity. Private repositories may contribute recency without exposing repository details.

  1. Harpoon

    Oct 15, 2026

    A Docker-compatible macOS runtime that runs Linux workloads without requiring Docker Desktop.

    Public repository ↗

  2. Conduit

    Oct 14, 2026

    A small provider-neutral AI driver layer for TypeScript, Python, and Rust applications.

    Public repository ↗

  3. Binder

    Oct 14, 2026

    A local-first desktop control surface for understanding a collection of development projects.

  4. Loom

    Oct 13, 2026

    A local-first long-form writing environment where the manuscript remains sovereign while structure and context gather around it.

  5. AP — AI Proxy

    Oct 12, 2026

    A public AI traffic plane that gives private applications ordinary HTTPS channels, protected access, and bounded service discovery.

02 / Practice

Currently learning

  • Local-first architectures
  • Provider-neutral AI interfaces
  • Native virtualization on macOS
  • Bounded AI and editorial workflows

03 / Materials

Tools in active rotation

  • TypeScript
  • React
  • Tauri
  • Rust
  • Node.js
  • Python
  • Swift
  • Next.js
  • Docker
  • Postgres
  • SQLite
  • Redis

04 / Bearings

How I try to work

  • Keep the source of truth explicit
  • Prefer small, replaceable boundaries
  • Keep optional intelligence bounded
  • Preserve familiar interfaces
  • Publish only what the evidence supports