Peter Fejér
Freelance Security Expert Founder at RedCocoon
Amsterdam, North Holland, Netherlands
Summary
👤
Senior🎓
Top SchoolPeter Fejér is a Freelance Security Expert and founder with over a decade of hands-on experience in offensive security, specializing in Red Team operations, malware development, and threat hunting. He has led and executed end-to-end engagements at global firms like Deloitte, developing custom C#/C++ tooling, researching EDR bypasses and Microsoft cloud (Entra/Azure) attack vectors, and mentoring technical teams. His consultancy, RedCocoon, focuses on strengthening resilience across enterprise networks, identity management, Active Directory, and web/cloud stacks through pragmatic security engineering, phishing simulations, and training. Peter pairs a developer’s rigor with operator instincts—regularly building bespoke tooling and automation to turn research into operational capability—and maintains industry-leading certifications while running client engagements from project work to longer contracts.
11 years of coding experience
5 years of employment as a software developer
Bachelor of Science (BSc), Computer Engineering, Bachelor of Science (BSc), Computer Engineering at Budapest University of Technology and Economics
English
Github Skills (47)
ctf9
agile9
flask9
dpapi9
kanban8
security8
attack-defense8
project-management8
web-application8
csharp8
burp7
tcp7
nextjs7
project-planning7
crud6
Programming languages (8)
Github contributions (5)
ptr0x1/mattermost-plugin-readonly-channel
Mar 2020 - Mar 2023
Simple server plugin to create read-only channels
Contributions:1 PR, 4 pushes in 3 years
ptr0x1/kanboard-plugin-zulip
Feb 2019 - Jul 2021
Kanboard plugin to integrate with Zulip
Contributions:3 releases, 10 commits, 2 PRs in 2 years 5 months
zulip
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