Daniel Duan
Summary
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RockstarDaniel Duan is a Senior Software Engineer with 16 years of experience focused on Swift and iOS, currently working on SwiftUI at Apple in Sunnyvale. He is an active open-source contributor — notably to swift-corelibs-foundation — where he implemented Swift evolution changes, fixed low-level string and inout behavior, and ensured cross-platform Foundation consistency. He also created and maintained Just, a Swift HTTP client, demonstrating strong back-end and networking skills within the Swift ecosystem. Previously at Lyft and drchrono he helped build design systems and production iOS applications, bridging polished UI work with systems engineering. A programmer since age 12 with early research into encryption energy efficiency, he brings both curiosity for low-level correctness and a pragmatic focus on shipping standards-aligned, reliable code.
16 years of coding experience
Github Skills (14)
text-manipulation10
http10
swift10
strings10
foundation-sites10
api-design10
foundation-site10
foundation10
computer-engineering9
api9
apim9
refactoring8
refactorings8
testing7
Programming languages (17)
Github contributions (5)
dduan/Just
Apr 2015 - Jun 2019
Swift HTTP for Humans
Role in this project:
Back-end Developer
Back-end DeveloperContributions:21 releases, 322 commits, 56 PRs in 4 years 3 months
Contributions summary:Daniel primarily focused on the development of the `Requests.swift` module, implementing core functionalities for handling HTTP requests and responses within the Swift environment. They introduced fundamental classes and methods for HTTP result processing, including features like JSON parsing, status code retrieval, and header management. Moreover, they added features such as basic authentication and cookie management. The user demonstrated skills in building a Swift HTTP client library.
for-humansswiftrequests
swiftlang/swift-corelibs-foundation
Dec 2015 - Dec 2017
The Foundation Project, providing core utilities, internationalization, and OS independence
Role in this project:Back-end Developer & Systems Engineer
Back-end Developer & Systems EngineerContributions:8 commits, 2 PRs, 26 comments in 2 years
Contributions summary:Daniel primarily contributed to the Swift-corelibs-foundation project by addressing code inconsistencies and updating the codebase to align with new Swift language features and standards. Their work involved fixing logic errors, optimizing code, and integrating changes related to inout adjustments (SE-0031) and other Swift evolution proposals. They also made improvements in string handling and corrected behavior to match expected results.
tvostranslationinternationalizationfoundationindependence
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