Nathan Racklyeft
Software Engineer at Apple
San Francisco, California, United States
Summary
🤩
Rockstar🎓
Top SchoolNathan Racklyeft is a seasoned software engineer with 16 years of experience building mobile and backend systems, currently focused on Health engineering at Apple in San Francisco. He has deep iOS expertise—shipping UI, data integration, and device pairing work for diabetes-related open-source projects like Loop and LoopKit, and RileyLink frameworks that integrate BLE devices with insulin delivery workflows. His background spans startups and big tech, from co-founding Brewmance to roles at Chairish and Google, giving him a pragmatic product sensibility alongside strong implementation skills. Notably, he has contributed needle-moving fixes across Swift charting, HealthKit integration, and Medtronic pump data parsing—signals of both clinical-domain fluency and low-level protocol experience. He pairs a biomedical engineering education with a developer’s obsession for shipping reliable, user-focused software.
16 years of coding experience
14 years of employment as a software developer
Bachelor’s Degree, Biomedical Engineering, Bachelor’s Degree, Biomedical Engineering at University of Michigan
Github Skills (27)
healthkit10
objective-c10
ios10
mobile-development10
python10
charts10
user-interface10
bluetooth-le10
data-parsing10
ui-design10
graphical-user-interface10
charting10
human-interface10
mobile-application10
btle10
Programming languages (7)
Github contributions (5)
LoopKit/Loop
Sep 2015 - Oct 2016
An automated insulin delivery app for iOS, built on LoopKit
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:22 releases, 589 commits, 245 PRs in 1 year 1 month
Contributions summary:Nathan was responsible for adding new features to the automated insulin delivery app for iOS, built on LoopKit. Their contributions focused on the implementation of several view controllers related to settings, carb entry, and bolus control. They implemented the UI interface and some of the underlying data-driven control. Additionally, the user worked on the logic behind the app's user interface.
iosdiabetesdiabetes-appdiabetes-prediction
LoopKit/LoopKit
Aug 2015 - Oct 2016
A set of iOS tools for building closed-loop insulin delivery apps
Role in this project:iOS Mobile Developer
iOS Mobile DeveloperContributions:16 releases, 256 commits, 117 PRs in 1 year 1 month
Contributions summary:Nathan contributed significantly to the development of an iOS application, LoopKit, focusing on building closed-loop insulin delivery apps. Their work primarily involved implementing and modifying UI components using Swift and related frameworks for a CarbKit component, including a table view controller for displaying and editing carb entries. The user also worked on integrating and testing the application's integration with HealthKit to manage and display the history and impact of carbohydrates.
ios
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