Arnold Schwaighofer
Compiler Engineer at Apple
Cupertino, California, United States
Summary
🤩
Rockstar🎓
Top SchoolArnold Schwaighofer is a seasoned compiler engineer with 13 years of experience building and hardening low-level tooling at Apple, Qualcomm, and in academic research. He specializes in Swift and LLVM ecosystems, contributing to high-profile projects like swift, swift-llvm, clang and the Swift Package Manager with a focus on code generation, calling conventions, sanitizers, and test/CI stability. Arnold combines deep compiler theory (SIMD vectorization, register allocation, polyhedral optimizations) from his Rice University work with pragmatic engineering—frequently stabilizing brittle test suites and fixing real-world CI failures. Based in Seacliff, California, he’s comfortable navigating both backend runtime bugs and infrastructure-level test automation, and his unusual mix of research-grade passes and hands-on test hardening helps keep large open-source compiler stacks shipping reliably.
13 years of coding experience
11 years of employment as a software developer
Bachelor, Computer Science, Bachelor, Computer Science at Johannes Kepler Universität Linz
Github Skills (40)
debugging10
objective-c10
debug10
c-language10
python10
foundation10
llvm10
testing10
internals10
foundation-sites10
vectorization10
addresssanitizer10
lldb10
xctest10
compiler-design10
Programming languages (8)
Github contributions (5)
swiftlang/swift
Mar 2020 - Jan 2023
The Swift Programming Language
Role in this project:
Back-end Developer
Back-end DeveloperContributions:403 reviews, 130 commits, 2339 PRs in 2 years 10 months
Contributions summary:Arnold contributed to the Swift programming language project by addressing compiler and runtime issues. Their work involved bug fixes and improvements in areas such as the interpreter, frontend, IRGen, and the compiler's handling of code generation and resilience. The contributions demonstrate a deep understanding of low-level compiler design and its interaction with the Swift runtime. They also show a focus on optimizing code generation.
swift-programmingswift-programming-languageprogramming-languageswift
swiftlang/swift-corelibs-foundation
May 2014 - Dec 2020
The Foundation Project, providing core utilities, internationalization, and OS independence
Role in this project:Back-end Developer
Back-end DeveloperContributions:23 commits, 8 PRs, 5 pushes in 6 years 7 months
Contributions summary:Arnold primarily focused on modifying the Swift standard library and Foundation framework code. Their contributions include differentiating between assertion types, annotating bridgeTo/FromObjectiveC methods for compiler optimization, and removing deprecated features related to non-Objective-C base classes. They also updated various files to use the swift calling convention for swift functions and made some improvements in NSIndexSet and NSDictionary to avoid a potential memory leak. Further, the user has been involved in codesigning test/stdlib, and addressing failing tests.
tvostranslationinternationalizationfoundationindependence
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