Tim Johnsen
IOS Engineer at Retro
Walnut Creek, California, United States
Summary
🤩
Rockstar🎓
Top SchoolTim Johnsen is a senior iOS engineer with 14 years of experience building polished mobile interfaces and performant apps, currently at Retro and running indie projects under tijo, inc. He specializes in Objective-C, Swift, and UIKit, and has shipped features at high-scale consumer products including Instagram, Pinterest, Patreon, and Flipboard. A long-time contributor to FLAnimatedImage, he has hands-on experience optimizing GIF rendering and caching for iOS, reflecting a focus on performance and reliability in multimedia UI. Based in Walnut Creek, CA, he pairs product-facing engineering with a history of mentoring and teaching iOS students at Arizona State University. Known for pragmatic implementation and side projects, he brings both startup agility and large-platform experience to mobile engineering challenges.
14 years of coding experience
12 years of employment as a software developer
B.S. Computer Science Software Engineering and Development Mobile Software, B.S. Computer Science Software Engineering and Development Mobile Software at Arizona State UniversityMonarch High School
Stackoverflow
1,471reputation
127kreached
73answers
12questions
Github Skills (12)
objective-c10
image-rendering10
ios10
caching9
xcode6
uitableview6
uiwebview6
iphone6
xor6
endianness6
nsdata6
ui-design5
Programming languages (11)
Github contributions (5)
Flipboard/FLAnimatedImage
Jun 2015 - Jan 2016
Performant animated GIF engine for iOS
Role in this project:
Mobile Developer (iOS)
Mobile Developer (iOS)Contributions:4 releases, 8 commits, 40 PRs in 6 months
Contributions summary:Tim primarily contributed to the improvement and maintenance of the FLAnimatedImage library, focusing on enhancing the performance and reliability of animated GIF rendering on iOS. Their work involved fixing issues related to delay times, merging code changes from feature branches, and refining the frame cache mechanism. The user also implemented caching of remotely loaded animated GIFs in the demo project and updated logging.
imageanimatedgifanimated-gifswift
timonus/OpenerManifest
Jul 2015 - Oct 2022
Set of rules powering Opener for iOS
Contributions:1 review, 20 PRs, 930 pushes in 7 years 3 months
openerdeep-linkingdeep-linkdeeplinkswift
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