Robert Ressl
Associate Director Of Offensive Security On Global
Zurich, Zurich, Switzerland
Summary
👤
Senior🎓
Top SchoolRobert Ressl is an Associate Director of Global Offensive Security based in Zurich with 11 years of experience blending deep DevOps engineering and hands-on red teaming for regulated enterprises. He leads international offensive programs—penetration tests, red team exercises and security audits—while translating findings into practical, auditable remediation and architecture improvements. A former DevOps lead and principal architect, he has built automation backends in Go, led Linux departments, and driven large migrations and PCI-DSS remediations that materially reduced operational risk. Robert is an active open-source contributor (notably enhancing the widely used chef/ohai project to improve Hyper-V detection) and brings a developer-hacker mindset with strong Ruby/Go skills. His academic background in information security (MAS and multiple CAS certifications) complements his ability to bridge technical execution and management for complex, highly regulated environments. Colleagues describe him as a little bit crazy in the best way—curious, relentless in reverse engineering, and effective at turning messy estates into secure, automated platforms.
11 years of coding experience
19 years of employment as a software developer
Certificate of Advanced Studies - CAS, Business Process Engineering, Certificate of Advanced Studies - CAS, Business Process Engineering at Lucerne University of Applied Sciences and Arts
German, English
Github Skills (7)
ruby10
oai10
testing10
chef-solo9
configuration-management9
chef-client9
linux8
Programming languages (7)
Github contributions (5)
chef/ohai
Nov 2018 - Nov 2018
Ohai profiles your system and emits JSON
Role in this project:
Backend Developer
Backend DeveloperContributions:11 commits, 1 PR, 1 comment in 1 day
Contributions summary:Robert primarily focused on enhancing the `ohai` project by adding functionality to detect Hyper-V guest hostnames. Their work involved modifying Ruby code within the `virtualization.rb` plugin to read data from specific files on a Hyper-V guest machine. Additionally, the user implemented unit tests for the new functionality, ensuring the accurate detection of the Hyper-V guest and its hostname, also made some chefstyle offenses.
configurationconfiguration-managementohaiemitsruby
safematix/macos_install
Dec 2017 - Jul 2019
Scripts for customized macOS machine setup and configuration.
Contributions:2 releases, 34 commits, 5 PRs in 1 year 7 months
macos
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