BX

Software Engineer

Breno
Xavier

Building tools at the intersection of AI systems, native applications, and platform infrastructure.

Based in Brazil / Available for remote work

The Notably macOS window: a sidebar listing four recordings beside a transcript of a client presentation, each line stamped with the second it was spoken.

Featured Project

Notably

A case study in local-first design

34K
lines of code
1,672
commits
4
months solo

Rust core with Tauri shell. Local-first Whisper transcription with Metal acceleration. Real-time audio processing via Core Audio FFI. No cloud, no subscriptions — your data stays yours.

Explore the project

Other Work

02
Cover art for gemini-mcp: two line-drawn robotic hands on black, one red and one blue, reaching toward a small glowing spark between their fingertips.

gemini-mcp

Bridge Claude to Gemini CLI

AI Tooling

MCP server enabling Claude Code to delegate tasks to Gemini for large context processing. Open source.

TypeScript ·MCP ·Gemini API
Random Picker on iPad: a sidebar of Lists, Dice, Wheel and Teams next to the Wheel screen, where a colour wheel of eight names has landed on Grace, announced above it, with a Spin button below.

RandomPicker

Decision making made fun

App Store

iOS/macOS app for random selection with customizable wheels and lists. Published on App Store.

Swift ·SwiftUI

Infrastructure & Tooling

03

  • Claude Code Tooling

    AI-assisted development infrastructure

    3 custom MCP servers, 18+ slash commands, 8+ skills, event-driven hooks. Meta-programming capabilities including skills that generate skills. Powers 5-10x velocity gains.

    TypeScript ·MCP SDK ·Bun ·Prompt Engineering

  • Self-Hosted CI/CD

    GitHub Actions infrastructure

    Mac Mini + MacBook Pro runners with shared sccache on Cloudflare R2. Power-aware scheduling via Hammerspoon. Supports Rust, Swift, and multi-platform builds.

    GitHub Actions ·sccache ·Cloudflare R2 ·Lua

Experience

04

A decade of shipping products across mobile, web, and systems programming.

  • 2025– Remote

    Binary Gap

    Independent / Contract

    Own products (Notably, RandomPicker) plus contract engineering. Most recently ten weeks as sole iOS engineer on a venture-backed agent-native team chat product.

    Swift ·SwiftUI ·UIKit ·Rust ·TypeScript
    Read the case study
  • 2021–2025 San Francisco, CA (Remote)

    unspun

    iOS Lead

    FitOS 3D body scanning with LiDAR. Built AI-powered garment measurement extractor (pgvector, 90% accuracy). 11+ Cloud Functions, Shopify/Stripe integrations.

    Swift ·LiDAR ·Python ·GCP ·pgvector
  • 2018–2021 Toronto, CA

    Pitstop

    iOS/Android Lead

    Fleet diagnostics platform with OBD-II and Bluetooth integration

    Swift ·Kotlin ·Node.js ·AWS