Cornelius Riemenschneider
Staff Software Engineer at GitHub
Copenhagen, Capital Region of Denmark
Summary
🤩
Rockstar🎓
Top SchoolCornelius Riemenschneider is a Staff Software Engineer with 16 years of experience building developer-focused systems, currently improving GitHub Copilot to turn LLMs into practical, high-impact tools. He combines deep back-end and build-system expertise—evidenced by significant contributions to Bazel’s remote caching and download subsystems and long-term stewardship of the CodeQL build tracer—with a strong security sensibility from work on CodeQL and its tracing features. At GitHub he has driven performance wins (speeding CI and builds by multiple factors), automated complex workflows with Airflow, and scaled testing infrastructures that run across tens of thousands of projects. Based in Copenhagen, he pairs rigorous academic training (MSc from University of Copenhagen, BS from KIT) with a practical knack for shaving seconds off developer feedback loops—an engineer who optimizes both tools and processes to make large-scale developer productivity tangible.
16 years of coding experience
6 years of employment as a software developer
Abitur, Abitur at Mönchsee-Gymnasium HeilbronnMaster of Science - MS Computer Science, Master of Science - MS Computer Science at Københavns Universitet - University of CopenhagenBachelor of Science - BS Computer Science, Bachelor of Science - BS Computer Science at Karlsruhe Institute of Technology (KIT)
German, English, French, Danish
Github Skills (31)
github-advanced-security10
caching10
http10
typescript10
build-system10
feature-flags10
java10
codeql10
javas10
lua10
go10
bazel10
typescript-types10
dotnet-core10
typescripts10
Programming languages (18)
Github contributions (5)
github/codeql-action
May 2022 - Nov 2022
Actions for running CodeQL analysis
Role in this project:
Back-end Developer
Back-end DeveloperContributions:10 reviews, 47 commits, 20 PRs in 6 months
Contributions summary:Cornelius primarily contributed to the codebase by introducing and modifying feature flags for Lua-based tracing within the CodeQL action. This involved changes to the runner and codeql files to enable and disable this tracing feature, and add tests for this feature flag. They also updated the version requirements for the Lua tracer and ensured it was correctly integrated within the analyze-action step. These changes appear to be focused on enhancing CodeQL's tracing capabilities.
code-scanningsemmle-qladvanced-securitycodeqlci
github/codeql
Sep 2019 - Sep 2022
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 & Security Engineer
Back-end Developer & Security EngineerContributions:324 reviews, 187 commits, 228 PRs in 3 years
Contributions summary:Cornelius primarily focused on updating Lua tracing configurations within the CodeQL repository. They modified the configuration files for C#, Swift, and Go, implementing proper handling for dotnet build processes and escaping patterns. Their work included improvements for security by incorporating changes to handle potential vulnerabilities. The user demonstrated expertise in understanding and adapting tracing configurations for various programming languages and build tools.
github-advanced-securitysecurity-toolsgithub-security-labsecurity-researcherssecurity
Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.