Ameziane Hamlat
Staff Performance-focused Engineer at Consensys
Paris, Ile-de-France
Summary
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Rockstar🎓
Top SchoolAmeziane Hamlat is a Staff performance-focused engineer based in Paris with 15+ years of JVM and Java performance expertise, currently leading performance initiatives at Consensys. He has a strong track record in financial services and blockchain, having optimized RocksDB, tuned memory and caches, and introduced LZ4 compression for the Hyperledger Besu Ethereum client to boost throughput and reliability. Known for bridging hands-on low-level optimization with system-level observability, he combines APM consulting experience at Société Générale and MAIF with formal training in Java performance, ELK, and MongoDB. Comfortable both as a technical leader and individual contributor, he brings practical improvements that show up in production performance and resilience. An uncommon strength is his ability to translate JVM internals into actionable configuration changes that unlock high-end hardware performance.
4 years of coding experience
2 years of employment as a software developer
Formation MongoDB, Formation MongoDB at MongoDB UniversityFormation KANBAN, Formation KANBAN at Société GénéraleFormation Certifiante Java Performance Tuning Java Performance, Formation Certifiante Java Performance Tuning Java Performance at XEBIAFormation ELK (ElasticSearch Logstash Kibana), Formation ELK (ElasticSearch Logstash Kibana) at ZENIKADiplôme d'ingénieur Computer sciences / Software, Diplôme d'ingénieur Computer sciences / Software at Polytech Nantes
Stackoverflow
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Github Skills (9)
rocksdb10
javas10
back-end-development10
ethereum10
blockchain10
java10
database-optimization10
compress9
lz49
Programming languages (8)
Github contributions (5)
hyperledger/besu
Jun 2022 - Jan 2023
An enterprise-grade Java-based, Apache 2.0 licensed Ethereum client https://wiki.hyperledger.org/display/besu
Role in this project:
Back-end Developer
Back-end DeveloperContributions:216 reviews, 16 commits, 122 PRs in 6 months
Contributions summary:Ameziane primarily contributed to the optimization and enhancement of the RocksDB storage component within the Besu Ethereum client. Their work included applying memory usage suggestions, updating cache sizes, and integrating LZ4 compression for improved performance. They also addressed a critical issue related to StacklessClosedChannelException, improving the reliability of the Engine API requests. Furthermore, the user added a high-spec flag to RocksDB configurations, enabling enhanced performance on high-end hardware.
besuhyperledgerlicensedethereump2p
ahamlat/besu
Mar 2022 - Apr 2025
An enterprise-grade Java-based, Apache 2.0 licensed Ethereum client https://wiki.hyperledger.org/display/besu
Contributions:2 PRs, 572 pushes, 102 branches in 3 years 1 month
besuhyperledgerlicensedethereumenterprise-grade
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