James Rantanen
Principal IOS Engineer at Stitch Fix
Missouri, United States
Summary
👤
Senior🎓
Top SchoolJames Rantanen is a Principal iOS Engineer with 13 years focused on building polished iOS and Apple platform experiences since 2009, currently leading design system and accessibility work at Stitch Fix. He drives cross-platform UX consistency by implementing design systems that support both SwiftUI and UIKit, and has retrofitted large apps with Dynamic Type, custom SF Symbols, and other accessibility patterns. Known for rescuing legacy codebases, he improves reliability, test suites, and CI performance while mentoring engineers and advising product teams. His background spans consumer-facing apps featured by Apple, solo indie work (Serenitea, an App of the Day), and open-source libraries for safer Objective-C eventing. Comfortable across the stack from Core Animation to Xcode build tuning, he blends deep platform craftsmanship with pragmatic product thinking. Based in Missouri, he brings a mix of hands-on engineering, developer-experience improvements, and long-standing commitment to accessible design.
13 years of coding experience
12 years of employment as a software developer
Bachelor’s Degree Computer Science Digital Media, Bachelor’s Degree Computer Science Digital Media at Greenville University
swift, objective-c
Github Skills (49)
objective-c10
ios10
parallax10
rxswift-extensions10
obj10
swift10
macos10
swiftui10
reactive9
reactiveswift9
rxswift9
authentication9
networking9
frp9
sdk9
Programming languages (2)
Github contributions (5)
RxSugar/RxSugar
Feb 2016 - May 2020
Simple RxSwift extensions for interacting with Apple APIs
Contributions:3 releases, 85 commits, 4 PRs in 4 years 4 months
rxswiftrxswift-extensionsextensionsswiftfrp
JARinteractive/ESCObservable
May 2013 - Jun 2015
Contributions:8 commits, 1 tag, 2 comments in 2 years 1 month
eventingswiftios
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