Dan Zimmerman
Software Engineer at Meta
Chicago, Illinois, United States
Summary
🤩
Rockstar🎓
Top SchoolDan Zimmerman is a software engineer with 15 years of experience specializing in low-level infrastructure and performance, currently working on AI software platform engineering at Meta. He brings deep expertise in the interaction between code generation and runtimes, with hands-on experience in LLVM and Android bytecode optimizers such as Redex, ProGuard and R8. His contributions to high-profile open-source projects like React Native and Redex reflect a pragmatic focus on refactoring, testability, and removing fragile experimental features to improve platform reliability. Dan’s background spans mobile performance at Spotify and system-level compiler work at Facebook, giving him a rare cross-platform view from iOS clang/LLVM work to on-device Android compilation. He also holds advanced studies in mathematics, which he leverages for rigorous performance analysis and tooling improvements.
15 years of coding experience
10 years of employment as a software developer
Masters Mathematics, Masters Mathematics at Loyola University ChicagoHighschool Mathematics & Physics, Highschool Mathematics & Physics at GCHS
English
Stackoverflow
2,558reputation
344kreached
80answers
20questions
Github Skills (25)
objective-c10
code-optimization10
c-language10
ios10
react-native10
mobile-development10
javascriptcore10
bytecode10
android10
cprogramming-language10
optimization10
javascript9
unit-testing9
java9
javas9
Programming languages (14)
Github contributions (5)
facebook/redex
Nov 2018 - Dec 2019
A bytecode optimizer for Android apps
Role in this project:
Back-end Developer
Back-end DeveloperContributions:70 commits, 7 PRs, 19 comments in 1 year 1 month
Contributions summary:Dan primarily contributed to the `facebook/redex` repository, a bytecode optimizer for Android apps. They focused on refactoring code to improve unit testability and introduced changes related to debug information stripping. The user's work included modifying the `StripDebugInfo` pass, enhancing the IRAssembler to support parent positions, and addressing issues with debug positions when inlining return code. These changes suggest a focus on optimizing the bytecode and improving its handling of debug information during the optimization process.
android-appandroid-appsbytecode
react/react-native
Oct 2017 - May 2018
A framework for building native applications using React
Role in this project:Mobile Developer (Android/iOS)
Mobile Developer (Android/iOS)Contributions:8 commits in 7 months
Contributions summary:Dan's commits primarily involve refactoring and removing experimental features within the React Native framework. They removed experimental features like whitelisted modules, `shouldBridgeInitializeNativeModulesSynchronously`, and `shouldBridgeLoadJavaScriptSynchronously`. Additionally, the user introduced a macro to disable poisoning of JavaScriptCore symbols and updated linkage for `FBJSContextStartGCTimers`. These changes suggest the user focuses on cleaning up the codebase and adapting it for iOS-specific implementations within the React Native framework.
reactandroidapp-frameworkiosmobile
Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.