Santa Clara, California
MattMarks.
Senior Software Engineer at Apple
I build the tools behind the tools: developer infrastructure at Apple scale by day, always cooking up something by night.
The short version
I'm a senior engineer at Apple, where I've spent the last several years building developer tools. I prototyped what became Xcode's intelligence features and was a lead engineer on Device Hub, which started as an internal Apple tool and now ships with Xcode to developers everywhere.
Outside of work, I'm always cooking up something. My iOS apps have been downloaded more than three million times, and these days my side projects orbit AI agents and developer tooling. I studied computer science and physics, and it shows: I like systems that are both correct and elegant.
- Now
- Apple · developer tools
- Based in
- Santa Clara, California
- Currently into
- AI agents & developer tooling
- Studied
- CS + Physics, University of Maryland
App Store downloads across my apps
years building developer tools at Apple
promoted in three years at Apple
B.S. degrees in Computer Science & Physics
Where I've been
Apple
Senior Software Engineer
- Catalyzed Xcode's new intelligence features: proposed the vision, secured leadership buy-in, and built the initial prototypes that proved feasibility, prompting formation of a dedicated team that carried the work through to launch.
- Lead engineer on Device Hub, the home for working with devices and simulators in Xcode. It began as an internal Apple tool and now ships publicly alongside Xcode; I introduced it at WWDC.
- Promoted twice in three years.
Apple
Test & Automation Engineer
- Owned quality for Xcode's debugging stack, leading a from-scratch build of a hardware testbed, automation pipelines, and an analysis & visualization front end.
- Orchestrated, graded, and presented results for thousands of simulated debugging tasks across varied configurations.
Nanotube
Creator of Popular iOS Applications
- Designed, developed, and marketed popular iOS apps as a one-person studio.
- Carbon (MTG Utility): 350,000+ downloads, 3,500+ reviews, 4.9-star average.
- Chooser!: 3,300,000+ downloads, 66,000+ reviews, 4.6-star average.
Delwiche Labs
Bioinformatics Researcher & Developer
- Built Python ML pipelines to analyze 10 TB of gene-expression data; developed custom clustering methods that surfaced 400+ novel gene candidates.
- Created an AR analysis app with ARKit and Swift rendering 80,000 data points in 3D at 60fps for interactive spatial exploration.
Shipped & loved
Device Hub
Ships with Xcode · WWDC 2026
A developer tool I helped build at Apple as one of its lead engineers: a single home for working with devices and simulators, with live screens, hardware controls, app and profile management, and built-in diagnostics. It started as an internal Apple tool and now ships to every developer alongside Xcode. I introduced it at WWDC.
Carbon
MTG Utility
The life counter Magic players keep coming back to: fast, precise, and designed for the table, not the screen.
View in App Storedownloads
rating
reviews
Chooser!
Tap to decide
Everyone puts a finger down, the app picks one. The fairest way to settle who goes first. Three million people agree.
View in App Storedownloads
rating
reviews
Projects & passions
What I reach for
Applied AI
Code-gen evals, rubrics & rewards, anti-cheat, prompt & tooling design, A/B telemetry
CI Systems & Automation
Hermetic builds, parallel shards, artifact & telemetry capture
Mathematics
Linear algebra, quantum mechanics, number theory
Foundations
B.S. Computer Science
B.S. Physics
University of Maryland, College Park
Graduated May 2020 with dual degrees: one for building systems, one for understanding why they work.
National Physics Honor SocietyHave something worth building? I read everything that lands in my inbox.