Lennart Koopmann
Houston, TX / Hamburg, GER, United States
Summary
🤩
RockstarLennart Koopmann is a founder and seasoned software engineer with 16 years building scalable, distributed systems and open-source tooling, best known as the creator and long-time lead of Graylog, a widely used open log management platform. He brings deep systems expertise—UNIX and socket programming, MongoDB mastery, search with Elasticsearch, and backend stacks in Java, Ruby, and PHP—paired with hands-on experience shipping production integrations like PayPal and RabbitMQ. Based in Houston, he now focuses on nzyme and Close Access Denial projects, continuing to blend product leadership with low-level engineering. A frequent conference speaker and prolific contributor to documentation and core codebases, he combines developer advocacy with pragmatic architecture work that spans ops, observability, and security.
16 years of coding experience
Github Skills (18)
markdown10
back-end-development10
graylog10
rs10
java10
javas10
markdown-it10
logging10
documentation10
rest-api9
elasticsearch8
elasticsearch-api8
elasticsearchquery8
aws-elasticsearch8
json8
Programming languages (13)
Github contributions (5)
Graylog2/documentation
Jan 2015 - Nov 2020
Archived Graylog documentation. See https://docs.graylog.org/ for the new documentation.
Role in this project:
Technical Writer
Technical WriterContributions:1 review, 139 commits, 7 PRs in 5 years 10 months
Contributions summary:Lennart focused on creating and improving documentation for the Graylog platform. The contributions primarily involved writing and editing installation guides, architecture explanations, and user documentation for features such as dashboards, extractors, and the Graylog collector. The work resulted in significant improvements to the documentation's structure and content, as seen in the added table of contents and clear explanations of key concepts.
graylog
Graylog2/graylog2-server
May 2010 - Dec 2022
Free and open log management
Role in this project:Back-end Developer
Back-end DeveloperContributions:3495 commits, 25 PRs, 41 pushes in 12 years 9 months
Contributions summary:Lennart's commits primarily focused on modifying Java code within the `graylog2-server` repository. The changes included alterations to date formats within dashboard widgets, the integration of a full GELF processing pipeline, improvements to the user interface for stream rule creation, and the implementation of functionality to allow email alerts to be sent. The user also contributed to the addition of configuration options and general enhancements to the system.
log-viewerloggingloggersecure-loggingsyslog
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