Kolin Krewinkel
Senior Staff Software Engineer at Facebook
Livermore, California, United States
Summary
🤩
Rockstar🎓
Top SchoolKolin Krewinkel is a Senior Staff Software Engineer with 14 years of experience building high-impact mobile experiences at scale from his base in Livermore, California. At Facebook he drives product direction, architects cross-platform solutions for iOS and Android, and mentors engineers while leading a ~30-person effort to improve core navigation for over a billion users. He combines hands-on engineering—shipping startup-time and UI personalization improvements, binary layout tooling, and feature "prewarming"—with product intuition and data-driven problem discovery. An active open-source contributor, Kolin has improved widely used projects like Facebook’s Chisel and Litho and created Polychromatic, an Xcode semantic-highlighting plugin, reflecting deep expertise in developer tooling and mobile debugging. Colleagues describe him as a pragmatic technical leader who balances execution, long-term strategy, and growing engineering talent.
14 years of coding experience
11 years of employment as a software developer
Granada High School
Stackoverflow
1,376reputation
280kreached
19answers
2questions
uiview
top-5%
Github Skills (39)
debugging10
objective-c10
debug10
xcode-plugin10
ios10
layout10
highlight10
syntax-highlighter10
user-interface10
ui-design10
android-recyclerview10
layoutmanager10
lldb10
java10
javas10
Programming languages (7)
Github contributions (5)
kolinkrewinkel/Polychromatic
Mar 2014 - Mar 2016
Semantic highlighting for Xcode.
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:6 releases, 157 commits, 18 PRs in 2 years
Contributions summary:Kolin made several commits related to modifying the Xcode plugin `polychromatic`. Their contributions include adding and refining the syntax highlighting features, particularly by implementing variable colorization based on analyzing the code's structure. The user demonstrated expertise by swizzling methods, implementing the preferences view, and fixing layout issues, all of which helped in the creation and improvements of the plugin. They also added basic support for theme installation.
swifthighlightingsemantic-highlightingxcodesemantic
facebook/chisel
Jul 2014 - Aug 2020
Chisel is a collection of LLDB commands to assist debugging iOS apps.
Role in this project:Mobile Developer (iOS)
Mobile Developer (iOS)Contributions:2 releases, 4 reviews, 8 commits in 6 years 2 months
Contributions summary:Kolin primarily contributed to the `chisel` project, a collection of LLDB commands for debugging iOS apps. They implemented commands to assist with debugging view hierarchies and view controllers, including printing descriptions, showing/hiding views, and drawing borders. The user also added commands to support view flickering and view walking, improving the debugging experience. Furthermore, they updated architecture detection for macOS.
objective-clldb-commandslldbloggingassist
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