Hi, I’m

Mat.

An iOS engineer from Austin with a passion for Swift, prototyping, and design.

Support Assistant

The generative AI assistant in the Apple Support app: streaming conversation, interactive task tiles and an App Clip that picks up where the web left off.

Cosmetic Assessment

Part of AppleCare One. Guides a user through photographing an Apple device, using a second iPhone or iPad, so its condition can be checked during coverage enrollment.

Apple Support

Apple's support app, in 32 languages across 174 regions. Release captain or lead on six-plus releases since the 2022 home redesign.

Deep Score

A sleep score of my own, built on Apple Watch data. It weights deep sleep the way I want and keeps Apple's Sleep Score alongside for comparison.

Personal · 2026 · Swift · SwiftUI · HealthKit · Swift Charts · App Intents

View case study →

Waves

A podcast client I have been building and rebuilding since 2020, with full CarPlay support, an App Clip, and a shared Swift package underneath it.

Outdoor Voices

Four years at a direct-to-consumer apparel brand, across the storefront, the consumer iOS app, and the internal tools the team used to run events and retail.

Dribe

Car subscription app for the Danish market. End-to-end mobile product covering vehicle browsing, booking, physical pickup with PIN-based unlock, and return. Membership tiers, co-drivers, loyalty rewards, and Stripe payments.

BSX Insight

Hardware-paired app for endurance athletes. Guides a lactate-threshold field test using a wearable muscle-oxygenation sensor and turns the result into personalized training zones.

Yuby

Kids banking app for Union Bank. A Webby Award nominee that turned saving money into something kids actually wanted to do: chores, wish lists, and the occasional money rain.

Mat Mullen is an iOS engineer based in Austin, Texas. He currently works on iOS at Apple, and previously iOS for Outdoor Voices. Outside of code, Mat is a rower, volunteer, gardener, husband and dad of two, one of them a black lab.

Mat and family on the coast