Jeroen Willemsen
Principal Security Architect at Undisclosed
Netherlands
Summary
🤩
Rockstar🎓
Top School
Top expert inComprehensive Cybersecurity and DevSecOps Practices
Jeroen Willemsen is a Principal Security Architect with 11 years of experience combining hands-on full‑stack development and deep security research, currently focused on software security automation, threat modeling, and modern platform hardening (Docker, AWS, Kubernetes). As an OWASP lead and project lead on WrongSecrets, he contributes to industry standards and practical tooling for mobile and application security. He has a strong track record integrating security into CI/CD, automating documentation and build processes for well-known OWASP projects like MASVS/MASTG, and improving reproducible PDF/tooling pipelines. Skilled at building and coaching security teams, he bridges business- and software‑architecture concerns to turn risk assessments into actionable engineering changes. Notably, his background includes mobile device hacking and authoring technical documentation, which gives him both offensive insights and a knack for clear, usable security guidance. Based in the Netherlands with an MSc in Computer Science, he blends research curiosity with pragmatic delivery across consulting and principal roles.
12 years of coding experience
13 years of employment as a software developer
Master Computer Science, Master Computer Science at Vrije Universiteit Amsterdam (VU Amsterdam)GreijdanusBachelor (Bc / B ICT) Business Informatics, Bachelor (Bc / B ICT) Business Informatics at WindesheimGH
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (22)
markdown10
git10
scripting10
automation10
script10
markdown-it10
automation-testing10
pdf-generation10
sh10
automations10
shell10
documentation10
ios9
cicd9
python9
Programming languages (18)
Github contributions (5)
OWASP/masvs
Sep 2016 - Aug 2020
The OWASP MASVS (Mobile Application Security Verification Standard) is the industry standard for mobile app security.
Role in this project:
Back-end Developer & DevOps Engineer
Back-end Developer & DevOps EngineerContributions:5 releases, 1070 commits, 269 PRs in 3 years 11 months
Contributions summary:Jeroen primarily contributed to the automation of PDF generation, indicating involvement in build processes and tooling. They wrote JavaScript code to support PDF creation using markdownpdf, integrating the changelog and other markdown files. The commits also include edits to Python scripts for exporting MASVS requirements and updates to shell scripts for document generation, demonstrating skills in scripting and automation. Furthermore, changes were made to the tools and configurations, showing their impact on the project's documentation and build process.
mobile-applicationowaspsecuritymasvsverification
OWASP/mastg
Oct 2016 - Aug 2020
The OWASP Mobile Application Security Testing Guide (MASTG) is a comprehensive manual for mobile app security testing and reverse engineering. It describes technical processes for verifying the OWASP Mobile Security Weakness Enumeration (MASWE) weaknesses, which are in alignment with the OWASP MASVS.
Role in this project:Technical Writer
Technical WriterContributions:13 releases, 1111 commits, 463 PRs in 3 years 10 months
Contributions summary:Jeroen primarily contributed to the documentation of the OWASP Mobile Security Testing Guide (MASTG). Their commits focused on updating the table of contents, incorporating changes from other branches, and refining the document generation process. The user also made adjustments to the documentation's formatting and structure to improve its clarity and presentation. Additionally, the user included updates to tools used for documentation generation like pandoc and image replacement scripts.
mobile-applicationmobile-securityowaspreverse-engineeringsecurity-testing
Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.