Ian Lynagh
Staff Software Engineer at GitHub
Greater Oxford Area United Kingdom
Summary
🤩
Rockstar🎓
Top SchoolIan Lynagh is a Staff Software Engineer with 23 years of experience specialising in functional programming, Haskell, and robust tooling for Linux/Debian environments. He champions strong static guarantees and warning-free, maintainable code, and has applied that philosophy across core open-source projects including GHC, Cabal, bytestring and the widely used CodeQL security libraries at GitHub. His work spans compiler internals, performance-sensitive libraries, and concurrent microsimulation fixes—often addressing portability, build systems, and subtle race conditions. A longtime Debian maintainer and former GHC engineer, he blends academic rigour from a DPhil at Oxford with practical production experience, repeatedly modernising legacy codebases for long-term reliability.
23 years of coding experience
14 years of employment as a software developer
DPhil (PhD) Computer Science, DPhil (PhD) Computer Science at University of Oxford
Github Skills (41)
kotlin10
dependency-management10
algorithms10
c-language10
simulation-modeling10
lib10
quickcheck10
testing10
test-framework10
analyse10
code-library10
cab10
build-system10
data-structure10
bytestring10
Programming languages (11)
Github contributions (5)
ghc/ghc
Dec 2002 - Aug 2013
Mirror of the Glasgow Haskell Compiler. Please submit issues and patches to GHC's Gitlab instance (https://gitlab.haskell.org/ghc/ghc). First time contributors are encouraged to get started with the newcomers info (https://gitlab.haskell.org/ghc/ghc/wikis/contributing).
Role in this project:
Back-end Developer & Core Contributor
Back-end Developer & Core ContributorContributions:7310 commits in 10 years 9 months
Contributions summary:Ian's primary contributions to the Glasgow Haskell Compiler (GHC) repository focused on improving and optimizing the compiler's code generation process. They addressed portability issues by making StgHalfWord and StgWord portable types, introduced changes to various CMM and core code generation routines, and implemented fixes for Windows-specific compilation, including handling dynamic libraries and file paths. Their work involved refining build processes, adding essential constants for platform compatibility, and updating legacy code to align with modern coding standards.
ghcget-startednewcomershaskellcabal
github/codeql
Oct 2019 - Jan 2023
CodeQL: the libraries and queries that power security researchers around the world, as well as code scanning in GitHub Advanced Security
Role in this project:Back-end Developer
Back-end DeveloperContributions:307 reviews, 900 commits, 625 PRs in 3 years 3 months
Contributions summary:Ian has contributed to the `github/codeql` repository, which involves the development of libraries and queries for security research. The commits primarily involve implementing features and fixing bugs within the Kotlin code used for the CodeQL project. The contributions demonstrate a focus on building and maintaining the code used for extracting and processing data related to software analysis.
github-advanced-securitysecurity-toolsgithub-security-labsecurity-researcherssecurity
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