Guillaume Galy
Senior Backend Developer at Gatling
Paris, Ile-de-France
Summary
🤩
Rockstar🎓
Top SchoolGuillaume Galy is a Senior Backend Developer based in Paris with 11 years of experience building resilient, high-performance server-side systems for enterprise clients and SaaS. He has a strong Scala/Java background and has led backend efforts across finance, e‑commerce and public sector projects, designing multi-tenant architectures, integrating Kafka-based data pipelines, and mentoring junior engineers. At Gatling he contributes to modern load-testing tooling and has upstream open-source contributions to Mill—improving build performance, dependency resolution and version parsing—which speaks to a deep interest in developer tooling and build systems. Equally comfortable with cloud-native stacks and legacy integration (ESBs, JMS), he combines pragmatic production delivery with attention to developer experience and automation.
11 years of coding experience
Ecole Nationale Supérieure des Ingénieurs en Arts Chimiques et Technologiquestitre professionnel Concepteur Développeur Informatique, titre professionnel Concepteur Développeur Informatique at AFPA
French, English, Italian
Github Skills (18)
kotlin10
mill10
loadtest10
build-system10
java10
cicd10
performance-testing10
scala10
javas10
automation10
build-tools10
automations10
gatling10
load-testing10
dependency-resolution10
Programming languages (10)
Github contributions (5)
com-lihaoyi/mill
May 2018 - May 2019
Mill is a fast JVM build tool that supports Java, Scala, Kotlin and many other languages. 2-4x faster than Gradle and 4-10x faster than Maven for common workflows, Mill aims to make your project’s build process performant, maintainable, and flexible
Role in this project:
Backend Developer
Backend DeveloperContributions:5 commits, 5 PRs, 23 comments in 1 year
Contributions summary:Guillaume primarily contributed to the development of the Mill build tool. Their work included fixing test modules and improving the build process by adding a "clean" task, which involved refactoring and improving path resolution within the clean task. Furthermore, they implemented dependency updates, including basic resolution and version checking, and ported sbt-updates functionality to Mill. They also refactored version parsing using fastparse.
zincshinymilljvmscala
gatling/gatling
Nov 2021 - Jul 2022
Modern Load Testing as Code
Role in this project:Back-end Developer & Automation Engineer
Back-end Developer & Automation EngineerContributions:1 review, 17 commits, 2 PRs in 8 months
Contributions summary:Guillaume contributed to documentation review and suggestions within the Gatling core, enhancing code samples across Java, Kotlin, and Scala for scenarios related to pause and pace configurations. They also fixed issues in the Gatling bundle scripts, notably addressing error handling and cleanup procedures in the enterprise package and deploy scripts, which included adjustments to batch files and shell scripts. Further contributions included adding a folder for user-provided libraries and implementing the ability to wait for run end on Enterprise.
gatlingload-testingloadtestingtestingscala
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