Josh Stone
Principal Software Engineer at Red Hat
Oregon, United States
Summary
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RockstarJosh Stone is a Principal Software Engineer at Red Hat with 26 years of systems and compiler experience, currently contributing to the Rust compiler as a Compiler Engineer and representative on the Compiler's Council. He combines low-level systems expertise—improving LLVM integration, memory/error handling, and binary-instrumentation tooling—with performance-driven backend work across high-profile Rust projects like rust-lang/rust, hashbrown, and cargo. Josh has a strong track record of algorithmic optimization and numeric library modernization (num, num-bigint), plus pragmatic build and release improvements that broaden platform support (rustup Docker and s390x). Known for refactors that reduce allocations and speed critical paths, he pairs deep technical rigor with long-term maintainability, mentoring and shaping toolchain quality from the trenches.
26 years of coding experience
Github Skills (68)
dependency-management10
cargo10
float3210
compiler-development10
testing10
fuse10
clippy10
bash10
deserialization10
numerics10
build-automation10
hashtable10
floating-point10
linting10
system-programming10
Programming languages (26)
Github contributions (5)
rust-num/num-traits
Dec 2017 - Jul 2022
Numeric traits for generic mathematics in Rust
Role in this project:
Back-end Developer
Back-end DeveloperContributions:38 reviews, 130 commits, 77 PRs in 4 years 7 months
Contributions summary:Josh primarily focused on refactoring and improving the `num-traits` library. Their contributions included restructuring the repository, updating dependencies, and optimizing code. They also added new features and enhanced existing ones, such as adding integer decoding and rounding methods. Additionally, the user worked on improving the documentation and testing the library's functionality.
mathematicsrustnum-traits
rust-num/num-bigint
Dec 2017 - Jul 2022
Big integer types for Rust
Role in this project:Back-end Developer
Back-end DeveloperContributions:27 reviews, 260 commits, 116 PRs in 4 years 7 months
Contributions summary:Josh's contributions primarily focused on refactoring and optimizing the `num-bigint` library, a big integer implementation in Rust. They improved the efficiency of core algorithms, such as modular exponentiation, division, and greatest common divisor (GCD) calculations by incorporating specialized methods for specific cases like single-digit divisors and addressing allocations in shift operations. Furthermore, the user added support for various Rust versions in the CI testing suite and performed code modernization tasks, including migration from deprecated features and upgrading dependencies.
bigintegerrustnum-bigint
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