Daniel Micay - Founder at GrapheneOS

Daniel Micay

Founder at GrapheneOS

Old Toronto, Ontario, Canada

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Summary

🤩

Rockstar

Daniel Micay is a seasoned security engineer and founder with 14 years of experience focused on mobile privacy and hardened system software. As the founder of GrapheneOS, he blends hands-on Android application work with deep low-level contributions to libc, memory allocators, and hardened malloc designs that improve platform resilience. His open-source footprint spans high-impact projects—from Android Bionic and jemalloc to Rust tooling and terminal emulators—demonstrating expertise across C/C++, Rust, and Android internals. He routinely tackles subtle, security-critical issues (guard pages for signal stacks, fortified libc functions, CSPRNG caches) that are easy to miss but crucial for real-world robustness. Based in Toronto, he pairs entrepreneurial leadership with day-to-day engineering, shipping privacy-first mobile apps like a permissions-free PDF viewer and camera with advanced QR handling.

14 years of coding experience

Stackoverflow

Stats

13reputation

42reached

0answers

1question

Github Skills (48)

kotlin10

algorithms10

libc10

memory-allocation10

c-language10

webview10

malloc10

system-programming10

memory-management10

c1110

ui-design10

camerax10

pdf-viewer10

security10

c1710

Programming languages (18)

SmaliJavaC++CSSCRustMakefileGo

Github contributions (5)

GrapheneOS/PdfViewer

Jun 2019 - Jan 2023

Simple Android PDF viewer based on pdf.js and content providers. The app doesn't require any permissions. The PDF stream is fed into the sandboxed WebView without giving it access to content or files. CSP is used to enforce that the JavaScript and styling properties within the WebView are entirely static.

Role in this project:

Mobile Developer (Android)

Contributions:19 releases, 8 reviews, 167 commits in 3 years 7 months

Contributions summary:Daniel primarily contributed to the development of the GrapheneOS PDF viewer application. Their work focused on enhancing the user interface and core functionality. This involved implementing features such as saving and restoring document orientation, adding padding for full-screen mode, and refactoring existing code for improved efficiency. The user also updated dependencies and fixed minor style issues within the application.

android-pdfviewerjavascriptpdfpdfjswebview

rust-random/rand

May 2013 - Mar 2014

A Rust library for random number generation.

Role in this project:

Back-end Developer

Contributions:15 commits in 10 months

Contributions summary:Daniel primarily contributed to the `rand` Rust library by refactoring code and updating the API. They removed obsolete keywords, replaced `for` loops with `foreach` or `do`, and renamed modules, such as `std::iterator` to `std::iter`, to simplify the code. They also refactored the code to use element counts in slices rather than byte sizes and removed the `float` type.

rust

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