Arnaud Roger
Consulting Software Engineer at Rapid7
Belfast, Northern Ireland, United Kingdom
Summary
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SeniorArnaud Roger is a Consulting Software Engineer based in Belfast with 11 years of professional experience focused on evidence-based, accountable software design and development. He specializes in Java, refactoring, performance and developer productivity, and has a track record of leading backend architecture for large financial systems including CME Group and electronic markets at Citi. At Rapid7 he progressed from Principal to Consulting Software Engineer, blending hands-on optimization with technical leadership across security and risk domains. An active contributor to notable open-source work—refactoring and optimizing the well-known RE2J Java regex engine—he brings practical low-level improvements that measurably reduce complexity and improve runtime behavior. Colleagues rely on him for pragmatic design, measurable performance gains, and steady delivery in high-stakes environments.
11 years of coding experience
20 years of employment as a software developer
French, English
Stackoverflow
1reputation
0reached
1answer
0questions
Github Skills (8)
javas10
performance-optimization10
java10
data-structure9
algorithm9
data-structures9
algorithms9
sharpsvn6
Programming languages (2)
Github contributions (5)
google/re2j
Oct 2017 - Oct 2017
linear time regular expression matching in Java
Role in this project:
Back-end Developer
Back-end DeveloperContributions:10 commits, 2 PRs, 15 comments in 2 days
Contributions summary:Arnaud primarily focused on refactoring and optimizing the internal workings of the regular expression engine. They removed code related to `progBuilder`, and further optimized the `Machine` class, reducing queue complexity and reusing arrays. The changes also included modifying the `Prog` class, replacing an `ArrayList` with an array, and consolidating functionality.
regular-expressionsmatchinglinear-timeregular-expressionregular
arnaudroger/mapping-benchmark
Sep 2015 - May 2019
Contributions:47 commits, 1 PR, 68 pushes in 3 years 9 months
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