Sergey Polzunov
Founder at Elastic
Amsterdam, North Holland, Netherlands
Summary
🤩
Rockstar🎓
Top SchoolSergey Polzunov is a founder and senior software engineer with 15 years of experience building security-focused engineering teams and products from Amsterdam. He combines deep hands-on development (Java and modern security data engineering) with entrepreneurial drive, founding BlackStork.io to automate security reporting and free teams to focus on high-impact work. At Elastic he advances threat research and detection engineering, after leading XDR hunting and R&D efforts at EclecticIQ and contributing to security engineering at Fox-IT and RIPE NCC. Sergey’s background spans startups and established vendors, giving him a practical sense for shipping reliable, production-grade cyber security tooling and data services. He holds an MEng in Computer Software Engineering and quietly pairs product-minded leadership with an emphasis on improving communication and collaboration to accelerate threat response.
15 years of coding experience
18 years of employment as a software developer
Igor Sikorsky Kyiv Polytechnic Institute
English, Ukrainian, Russian
Stackoverflow
339reputation
23kreached
9answers
0questions
Github Skills (186)
python10
http10
security10
graph-visualization10
cyber-threat-intelligence10
ohm10
jupyter-widget10
js10
threat-hunting10
graph10
python-requests10
phishing10
elastic10
scanner9
splunk9
Programming languages (15)
Github contributions (5)
eclecticiq/cabby
Dec 2014 - Jun 2020
TAXII client implementation from EclecticIQ
Contributions:2 reviews, 261 commits, 21 PRs in 5 years 7 months
javataxii-clienttaxiistixcti
blackstork-io/blackstork-cli
Feb 2024 - Jul 2025
A source-available command-line tool for cybersecurity reporting
Contributions:99 reviews, 102 PRs, 198 pushes in 1 year 4 months
command-line-toolcybersecurityctireportingsecops
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