Daniel Grumberg
Senior Software Engineer at Apple
London, England, United Kingdom
Summary
🤩
Rockstar🎓
Top SchoolDaniel Grumberg is a Senior Software Engineer based in London with 11 years of experience specializing in developer tooling—particularly documentation tooling, compilers, and IDE integrations. He has significant open-source impact on high-profile projects like Swift's DocC and the LLVM toolchain, improving symbol graph generation, API serialization, and cross-framework inheritance handling. At Apple he has driven documentation and compiler features used by Xcode and Swift OSS, mentored contributors (including GSoC mentees), and now works on distributed cloud-native systems powering Apple releases. His background combines deep compiler expertise from production compiler contributions with practical tooling instincts that reduce friction for library authors and IDEs. Less obvious: he has a track record of fixing subtle serialization and indexing bugs that improve tooling interoperability across language and framework boundaries.
10 years of coding experience
5 years of employment as a software developer
Master of Engineering - MEng Computer Science, Master of Engineering - MEng Computer Science at Imperial College London
English, French, German, Hebrew
Stackoverflow
31reputation
619reached
3answers
2questions
Github Skills (18)
json10
modular-system10
c-language10
api-design10
llvm10
compiler-construction10
swift10
cprogramming-language10
documentation10
testing9
serialization9
apidoc9
data-serialization9
api9
xcode8
Programming languages (8)
Github contributions (5)
llvm/llvm-project
Jan 2019 - Mar 2025
The LLVM Project is a collection of modular and reusable compiler and toolchain technologies.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:27 reviews, 46 PRs, 79 pushes in 6 years 2 months
Contributions summary:Daniel primarily worked on enhancing the ExtractAPI component of the LLVM project, focusing on the serialization and handling of API information. Their commits involved modifying the `SymbolGraphSerializer.cpp` and related header files to correctly represent features like availability attributes, anonymous record types, and template parameters within the symbol graph. They also contributed to declaration fragment generation and fixed issues related to nested structures and macros to provide more accurate API representations.
compilerstechnologiesclangsubmittoolchain
swiftlang/swift-docc
Mar 2022 - Nov 2022
Documentation compiler that produces rich API reference documentation and interactive tutorials for your Swift framework or package.
Role in this project:Backend Developer
Backend DeveloperContributions:194 reviews, 10 commits, 29 PRs in 8 months
Contributions summary:Daniel primarily focused on enhancing the SwiftDocC documentation compiler. Their contributions included implementing features related to inheritance relationships within the documentation, specifically handling cases where the superclass resides in a different framework. They also worked on improving the RenderIndex JSON specification, adding properties like `external` and `beta` nodes, and ensuring the correct encoding/decoding of these features. Additionally, the user addressed a bug in the NavigatorIndex concerning deprecated nodes.
apiswiftpmcompilerinteractive-tutorialsswift
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