Jonhnathan Cesar
Senior Security Research Engineer at Elastic
São Paulo, Brazil
Summary
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Rockstar🎓
Top SchoolJonhnathan Cesar is a Senior Security Research Engineer based in São Paulo with eight years of hands-on experience building detection logic, threat intelligence, and protection features for Elastic Security. Self-taught and promoted through multiple roles at Elastic, he combines research, detection engineering, and QA/test automation—contributing to the well-known elastic/detection-rules repo by strengthening its test suite and ensuring rule accuracy. His background spans endpoint/SIEM detection, threat hunting, MDR development, and automation of validation processes, giving him a practical operator’s view of detection lifecycles. At 26 he brings rapid learning, a bias for automation, and a knack for turning detection hypotheses into reliable, testable rules that scale across cloud and endpoint environments.
8 years of coding experience
2 years of employment as a software developer
Self-taught
Portuguese, English
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (11)
pytest10
threat-hunting10
python10
intrusion-detection10
malware-detection10
test-automation10
amazon-elasticsearch9
elasticsearch-api9
aws-elasticsearch9
elasticsearchquery9
elasticsearch9
Programming languages (7)
Github contributions (5)
elastic/detection-rules
Sep 2021 - Jan 2023
Role in this project:
QA Engineer / Test Automation Engineer
QA Engineer / Test Automation EngineerContributions:1262 reviews, 741 commits, 820 PRs in 1 year 4 months
Contributions summary:Jonhnathan's contributions primarily center on enhancing the test suite for the `elastic/detection-rules` repository. Their work includes adding new tests, modifying existing ones, and ensuring the accuracy of rule definitions by checking for missing integrations, risk score mismatches, and proper handling of Osquery plugin notes and tag consistency. They also updated test-related code files.
security-toolselasticsecurityengine-detectionrules
w0rk3r/w0rk3r
Jan 2021 - May 2024
Contributions:9 pushes, 1 branch in 3 years 4 months
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