Xavier Léauté
Principal Engineer at Confluent
San Francisco, California, United States
Summary
🤩
Rockstar🎓
Top School
Top expert inData Engineering and Analytics Technologies
Xavier Léauté is a Principal Engineer based in San Francisco with 14 years building high-performance distributed systems and real-time analytics. A founding committer and active PMC member for Apache Druid, he has driven core query, storage (S3) and timezone features that power large-scale analytics workloads. At Confluent he has contributed backend and REST infrastructure improvements across Kafka and KSQL—adding WebSocket query endpoints, server metadata, and robustness fixes—while also shaping deployment and DevOps docs for containerized platforms. His background spans quantitative roles at BlackRock and Barclays, giving him a strong foundation in numerical methods and production-grade data engineering. Comfortable across JVM, Python, and build tooling, he blends deep algorithmic instincts with pragmatic release and compatibility work (including Java/JVM targeting and packaging). Colleagues rely on him for thoughtful design in latency-sensitive systems and for bridging open-source projects into enterprise-ready deployments.
14 years of coding experience
6 years of employment as a software developer
Master, Engineering, Applied Mathematics, Master, Engineering, Applied Mathematics at Ecole Centrale ParisMaster of Engineering, Operations Research, Master of Engineering, Operations Research at Cornell University
French, German, English
Github Skills (53)
api-rest10
gzip10
docker10
python10
package-management10
back-end-development10
api-design10
compress10
restful-api10
css10
gunzip10
kafka10
sbt10
websocket10
apache-druid10
Programming languages (12)
Github contributions (5)
druid-io/druid-io.github.io
Apr 2013 - Sep 2016
Druid Project Website
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:285 commits, 77 PRs, 58 pushes in 3 years 5 months
Contributions summary:Xavier primarily contributed to the website's front-end by implementing the initial layout structure and making subsequent adjustments. The contributions include modifications to the header, footer, and content sections, and fixing broken links. Further contributions included adding Google Analytics and a Disqus comment section to the website.
project-websitedruid
apache/druid
Oct 2012 - Oct 2022
Apache Druid: a high performance real-time analytics database.
Role in this project:Back-end Developer
Back-end DeveloperContributions:6 releases, 290 reviews, 1301 commits in 10 years
Contributions summary:Xavier primarily contributed to the development of the Apache Druid database, specifically enhancing its analytical capabilities. Their contributions involved adding and optimizing functionalities related to query processing, including improvements for approximate histogram aggregators and the handling of data segments in the S3 storage layer. Additionally, the user worked on improvements related to Java, specifically for features related to timezone support.
apache-druiddatabasedruid
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.