juan.dev

Juan Martinez

Software Developer

Specializing in modern web development and full-stack solutions

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Things I've Built

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BG Cut: Local Background Removal for the Browser, CLI, and Node

2026LIVE

A background remover that runs on your own machine. It uses WebGPU and ONNX Runtime across a hosted web app, a local app, a batch CLI, and a Node API, and source images never leave the device.

Solid 2

Reactive UI for the hosted and local apps

TypeScript

Typed Node API, CLI, and browser runtime

WebGPU

GPU inference and image compositing in the browser

ONNX Runtime

BiRefNet Lite inference on WebGPU, WebAssembly, and native CPU

Cloudflare

Workers Static Assets plus R2 for model and runtime files

Live Site Git Repo NPM Package Read more

GPUix Solid: Solid 2 Bindings for Native GPU Interfaces

2026

An independently implemented Solid 2 renderer for GPUIX and GPUI. It connects Solid’s universal runtime and fine-grained reactivity to Zed’s GPU-accelerated UI stack.

Solid 2

Universal renderer and fine-grained reactivity

TypeScript

Typed renderer, component, and automation APIs

GPUIX

Public native mutation and element contract

GPUI

Zed’s GPU-accelerated UI framework

Rust / N-API

Native retained-tree bridge through @gpuix/native

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Mesurer Solid: UI Measurement for Humans and Coding Agents

2026

A framework-agnostic browser inspection and visual context layer built with Solid 2 for measuring interfaces, annotating intent, and giving coding agents exact rendered evidence.

Solid 2

Isolated renderer and reactive UI runtime

TypeScript

Typed measurement, plugin, and agent contracts

Browser DOM

Framework-independent rendered UI inspection

Manifest V3

Extension delivery for arbitrary Chromium pages

Web APIs

Geometry, styles, screenshots, and interaction state

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MACROS: Local-First Calorie and Macro Tracker

2026LIVE

A native iPhone calorie and macro tracker with SwiftUI, SwiftData, widgets, barcode and nutrition-label scanning, optional sharing, and supporting Cloudflare/Convex services.

SwiftUI

Native iPhone UI framework

SwiftData

Local-first persistence for food and log data

WidgetKit

Home Screen and Lock Screen macro widgets

StoreKit

Full Unlock purchase and restore flow

Convex

Optional invite-based sharing backend

Cloudflare Workers

Auth, invite redirects, and food-search API workers

Astro

Product, privacy, waitlist, and support site

Bun

Tooling for web, worker, and backend packages

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A Model-Independent Control Platform for a Browser DAW

2025LIVE

A versioned control contract for browser and desktop DAW operations, with typed SDK clients, MCP and CLI adapters, bounded JSONL transport, and packaged Electron acceptance.

Control contracts

Versioned V1/V2 requests, snapshots, approvals, commits, and recovery records

Control core

Pure planning, projection, MIDI resolution, deletion, and recovery semantics

Control SDK

Typed transport-neutral clients for cloud and desktop targets

MCP + JSONL

Thin model and process adapters over the canonical operation catalog

Electron

Authenticated packaged desktop host and native control transport

VST3

Desktop host discovery, parameters, editors, playback, and recovery