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.
10 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 (56)
ctf9
security9
agile9
flask9
attack-defense9
dpapi8
kanban8
integrate8
project-management8
web-application8
csharp7
payload7
tcp7
correlation7
redirect7
Programming languages (7)
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
integratekanboardkanboard-pluginzulip
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