Software for Apple platforms, built close to the metal.

Digital Foundry LLC is the one-engineer software studio of Roberto Gutierrez: more than twelve years of staff-level iOS and tvOS work, now focused on the newest layer of the stack, AI that runs entirely on the device in your user's hand.

What we do

Three things, done with a compiler watching.

Apple-platform engineering. Swift and SwiftUI applications for iPhone, iPad, and Apple TV, from architecture to App Store.
On-device AI. Apple Foundation Models, MLX, and local inference infrastructure: features that ship with no API bill and no data leaving the device.
Books and tools for developers. Technical writing where every code snippet is compiler-verified and every benchmark is reproducible.

Current release

What's on the bench right now.

Book · 12 chapters + code

On-Device Intelligence: The Apple Developer's Guide to Shipping Private, Local AI

An engineer-to-engineer guide to Foundation Models and MLX: guided generation, tool calling, memory budgets, App Review, and regression evals that run on your own hardware. Ships with a companion Swift package of runnable tools.

Read about the book

Contact

One inbox, read by the person who writes the code.

Questions about the book, licensing for teams, or Apple-platform consulting: send an email or find me on LinkedIn. Replies come from an engineer, not a funnel.