Dave DeLong is a software craftsman with fifteen years of building iOS and macOS apps that ship on billions of devices - and, he likes to point out, some that run in outer space. A seven-year Apple veteran who worked on Siri, UIKit, Apple Maps, and Developer Evangelism, he led the WWDC app from 2013 to 2015 and helped ship the first releases of Swift, WatchKit, HomeKit, and HealthKit. He is among the top contributors of all time on Stack Overflow, a fixture of the Swift Evolution process, and the author of widely cited open-source libraries on calendrical math. He blogs at davedelong.com, speaks at conferences worldwide, and is currently building a stealth startup.
Dilawar Mahmood is a machine learning engineer at ZeroEntropy (YC W25) in San Francisco, best known for four years at Apple where he optimized on-device models for Siri and Spotlight - work he once presented directly to Tim Cook at the Steve Jobs Theater. A Norwegian-educated engineer who left a comfortable career track to attend the Recurse Center and rediscover what programming actually feels like, he builds distributed ML frameworks in his spare time and is on record hating vibe coding.