Clément Mathieu
Senior Staff Engineer at Enphase Energy
Valbonne, Provence-Alpes-Côte d'Azur, France
Summary
👤
Senior🎓
Top SchoolClément Mathieu is a Senior Staff Engineer with 14+ years building resilient backend systems, internal developer platforms and observability-driven architectures, currently shaping Enphase Energy’s Home Energy Management SaaS. He has deep JVM and Java expertise, a track record of redesigning large multi-tenant IoT platforms and migrating complex services across cloud providers to improve scalability and reliability. Known for preferring simple, robust designs born from decades of incident response, he routinely drives improvements in CI/CD, testing and developer experience while mentoring teams and advising executives. A long-time open-source maintainer, he contributed performance-critical work to stream-lib (HyperLogLog/CountMinSketch optimizations), reflecting practical interest in streaming algorithms and cardinality estimation. Based in Valbonne, France, he blends hands-on technical craft with systems-level thinking and a pianist’s precision—qwerty on GitHub hints at a playful side beyond code.
14 years of coding experience
14 years of employment as a software developer
bachelor, Computer Science, bachelor, Computer Science at Université Côte d'AzurMaster's degree, computer science: Networks & distributed systems, Master's degree, computer science: Networks & distributed systems at Université de Nice-Sophia Antipolisassociate, Mathematics, associate, Mathematics at Université de Reims Champagne-Ardenne
Stackoverflow
3,070reputation
142kreached
46answers
21questions
apache
top-5%
java
top-5%
hadoop
top-5%
serialization
top-5%
Github Skills (20)
algorithm10
algorithms10
data-structure10
java10
javas10
performance-optimization10
hyperloglog10
data-structures10
hadoop9
apache9
testing9
serialization9
avro-tools6
deserialization6
equals6
Programming languages (15)
Github contributions (5)
addthis/stream-lib
May 2013 - Jul 2013
Stream summarizer and cardinality estimator.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:15 commits, 1 comment in 2 months
Contributions summary:Clément primarily contributed to the `stream-lib` repository, focusing on performance improvements and feature enhancements related to cardinality estimation algorithms, specifically HyperLogLog and CountMinSketch. Their work involved optimizing existing code, adding new functionalities like the `addAll` method and faster `merge` operations, and addressing potential performance bottlenecks. These changes aimed to improve the efficiency of cardinality estimations. The user also fixed a Java 6 regression issue.
pythoncardinalitymachine-learningsummarizerstream
cykl/infoqscraper
May 2012 - Apr 2017
Download presentations from InfoQ
Contributions:166 commits, 2 PRs, 28 pushes in 4 years 11 months
infoq
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