Owen Mansel-chan
CodeQL Software Engineer at GitHub
England, United Kingdom
Summary
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RockstarOwen Mansel-chan is a CodeQL Software Engineer at GitHub with six years of professional experience building security-focused tooling and scalable back-end systems. He specializes in CodeQL for Go, contributing to the flagship github/codeql repository by refactoring internal data-flow implementations, adding ContentSet abstractions, and improving Go code-scanning accuracy. Prior to GitHub he worked at Diffblue, gaining strong foundations in automated analysis and developer tooling. Based in England, he blends practical engineering with security research, shipping changes that directly improve code-scanning for millions of repositories. Owen’s work is notable for tackling subtle data-flow bugs and evolving core libraries rather than only surface-level query development. He brings a pragmatic approach to complex static analysis problems, balancing long-term maintainability with immediate scanning effectiveness.
6 years of coding experience
3 years of employment as a software developer
Github Skills (6)
analyse10
go10
dataflow10
codeql10
data-analysis10
github-advanced-security9
Programming languages (6)
Github contributions (5)
github/codeql
May 2020 - 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:1147 reviews, 600 commits, 498 PRs in 2 years 8 months
Contributions summary:Owen updated data flow libraries, refactoring and introducing functionality for Go code scanning within the CodeQL project. They made several changes to the internal data flow implementation, including the addition of ContentSet and the refactoring of the SummarizedCallable. The user introduced several changes to existing data-flow related implementations and fixed bugs.
github-advanced-securitysecurity-toolsgithub-security-labsecurity-researcherssecurity
owen-mc/codeql-go
May 2020 - May 2022
The CodeQL extractor and libraries for Go.
Contributions:1 PR, 274 pushes, 189 branches in 2 years
golangcodeql
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