Benjamin Lerer
Principal Software Engineer at Elastic
Pully, Vaud, Switzerland
Summary
🤩
Rockstar🎓
Top SchoolBenjamin Lerer is a Principal Software Engineer based in Pully, Switzerland with 12 years of experience building high-performance, production-grade distributed systems. He has deep expertise in Apache Cassandra—rising from committer to PMC member—and led engineering teams at DataStax and IMC where he delivered dramatic improvements in storage efficiency and real-time throughput. At IMC he designed a bespoke binary market-data format that was 10x smaller and decoded 4x faster, and more recently contributed memory-measurement tooling enhancements to notable Java tooling like jamm. Now at Elastic, he combines hands-on systems engineering with technical leadership, driving reliability and scalability across large data platforms. His background in earth observation science and physics gives him a methodical, measurement-driven approach to system design and performance optimization. Colleagues describe him as a pragmatic engineer who balances deep protocol-level knowledge with practical delivery and open-source stewardship.
12 years of coding experience
18 years of employment as a software developer
Maîtrise Physique, Maîtrise Physique at Université Côte d'AzurMaster of Science (M.Sc.) Earth Observation Science, Master of Science (M.Sc.) Earth Observation Science at University of Leicester
English, French
Stackoverflow
59reputation
3kreached
4answers
0questions
Github Skills (14)
javas10
memory-management10
java10
testing10
annotate9
annotations9
debug8
debugging8
trigger6
cqlsh6
math6
cassandra6
jquery6
whereclause6
Programming languages (3)
Github contributions (5)
jbellis/jamm
Nov 2014 - Nov 2018
Java Agent for Memory Measurements
Role in this project:
Backend Developer
Backend DeveloperContributions:97 reviews, 10 commits, 15 PRs in 4 years 1 month
Contributions summary:Benjamin primarily contributed to the `jamm` repository by implementing new features and fixing bugs related to memory measurement in Java. Their work included adding an `Unmetered` annotation to exclude specific fields from size calculations, allowing control over the classes tree being printed for debugging, and also fixing edge cases in the existing tests. These changes enhanced the functionality and debugging capabilities of the Java agent.
memoryagentjava-agentmeasurementsmemory-measurements
blerer/horizondb
Jan 2014 - Oct 2015
Contributions:86 commits, 18 pushes in 1 year 9 months
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