Cezar Lungu
Penetration Tester
Poland
Summary
🤩
RockstarCezar Lungu is a penetration tester and cyber security specialist with seven years of hands-on experience assessing web and mobile applications for Global 500 and government clients. He combines deep technical skills—reverse engineering React Native apps, evaluating JavaScript obfuscation, and developing custom exploit scripts—with practical DevOps experience contributing to widely used VPN installers like OpenVPN and WireGuard. As a bug bounty hunter he’s responsibly disclosed critical flaws in major open-source git-hosting projects, helping protect tens of thousands of users. He also teaches secure coding through live, hands-on training and consults on secure architecture and vulnerability remediation. Based in Poland, Cezar blends offensive research with automation and infrastructure hardening, often surfacing issues that only emerge when static and dynamic analyses are combined.
7 years of coding experience
Github Skills (20)
scripting10
linux10
bash10
unbound10
openvpn10
networking10
iptables10
wireguard10
centos9
debian9
fedora8
system-administration8
encryption8
firewalld8
archlinux8
Programming languages (4)
Github contributions (5)
angristan/openvpn-install
Sep 2018 - Dec 2021
Set up your own OpenVPN server on Debian, Ubuntu, Fedora, CentOS, Arch Linux and more
Role in this project:
DevOps Engineer
DevOps EngineerContributions:6 reviews, 21 commits, 29 PRs in 3 years 3 months
Contributions summary:Cezar primarily contributed to the automation and improvement of the OpenVPN installation script. Their work includes adding a self-hosted DNS resolver (Unbound) with OS-specific configurations for Debian, CentOS, Fedora, and Arch Linux. They updated the easy-rsa version, incorporated SELinux policy management on CentOS, and added support for client-configuration-dir, enhancing the overall functionality and manageability of the OpenVPN setup. Additionally, the user made modifications to address issues related to DNS and TLS configurations.
nginxcensorshiparchlinuxon-servervpn
angristan/wireguard-install
Apr 2020 - Nov 2020
WireGuard VPN installer for Linux servers
Role in this project:DevOps Engineer
DevOps EngineerContributions:8 reviews, 6 commits, 15 PRs in 7 months
Contributions summary:Cezar primarily contributed to improving and maintaining the WireGuard VPN installer. Their work included refactoring the installation script, adding input validations, and enhancing error handling. They also addressed specific issues related to the client's configuration, updated the README to reflect changes, and improved the uninstallation process. The user's changes focused on improving the overall reliability and usability of the installer.
privacyvpnlinuxinstallerwireguard
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