Jeff Hiner
Software Engineer at Cloudflare Inc
Summary
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RockstarJeff Hiner is a software engineer with seven years of experience specializing in Rust for embedded and scaled systems, focusing on back-end and security-sensitive components. He contributes to notable open-source projects—improving core DNS functionality in hickory-dns and hardening cryptographic primitives and protocol implementations in Cloudflare’s popular userspace WireGuard implementation, boringtun. Jeff is skilled at refactoring unsafe or custom crypto into vetted RustCrypto and x25519_dalek primitives, reducing technical debt while improving performance and safety. He has a strong attention to protocol correctness and resilience, shown by fixes across DNS parsing, server request handling, and noise/AEAD integrations. Comfortable working deep in systems code, he brings practical, security-first engineering to networking and embedded stacks. An often-unspoken strength is his tendency to replace bespoke implementations with well-audited crates, trading clever hacks for long-term maintainability.
7 years of coding experience
Github Skills (12)
x2551910
rust10
nameserver10
dns10
cryptography10
server10
wireguard10
dns-resolver10
ring9
io7
dockers3
docker3
Programming languages (9)
Github contributions (5)
cloudflare/boringtun
Jun 2021 - Jan 2023
Userspace WireGuard® Implementation in Rust
Role in this project:
Back-end Developer & Security Engineer
Back-end Developer & Security EngineerContributions:40 reviews, 20 commits, 39 PRs in 1 year 6 months
Contributions summary:Jeff primarily focused on improving the cryptographic aspects of the project. They addressed clippy warnings, removed deprecated or unsafe code, and replaced a custom X25519 implementation with the x25519_dalek crate, significantly improving key generation performance. The user also refactored noise protocol components, replacing macros with functions and incorporating the ring crate for AEAD operations and replaced custom Blake2s implementation with a RustCrypto crate implementation.
userspacecloudflarerustvpnwireguard
hickory-dns/hickory-dns
Apr 2022 - Dec 2022
A Rust based DNS client, server, and resolver
Role in this project:Back-end Developer
Back-end DeveloperContributions:12 reviews, 14 commits, 9 PRs in 8 months
Contributions summary:Jeff focused on improving the `hickory-dns` project, contributing to the core DNS functionality. They addressed parsing issues within the `svcb.rs` file and made improvements related to handling of SvcParamKey::Unknown in `crates/client/src/serialize/txt/rdata_parsers/svcb.rs`. Additionally, the user fixed issues in the server-side handling of requests by refining the structure of `crates/server/src/server/https_handler.rs` and `crates/server/src/server/quic_handler.rs`, and `crates/server/src/server/server_future.rs`. The contributions involved significant code adjustments and refactoring within the core of the DNS server and resolver components.
mdnsresolvedns-clientdnsresolver
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