Sebastien Deleersnyder
Co-founder & CTO at Tall Solutions
Ghent Metropolitan Area Belgium
Summary
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Rockstar🎓
Top SchoolSebastien Deleersnyder is a seasoned application security leader, co-founder and CTO of Toreon with over a decade of experience turning secure development principles into practical, organization-wide capabilities. He blends a developer background with deep AppSec expertise—leading OWASP SAMM as a project co-leader, founding the OWASP Belgium chapter, and helping adapt security models for DevOps and threat modeling. A sought-after trainer and speaker, he has delivered threat modeling workshops at Black Hat, O'Reilly and OWASP events and trains developers to build security into the lifecycle. Beyond consultancy and product work, he helped modernize the OWASP SAMM website and content, showing he contributes both to standards and the hands-on tools that make them accessible. Based in Ghent, he also chairs the Belgian Cyber Security Coalition AppSec focus group and runs training initiatives at the Data Protection Institute, reflecting a rare mix of community leadership, technical depth and practical teaching.
11 years of coding experience
24 years of employment as a software developer
Middle Management Programme, Middle Management Programme at Vlerick Leuven Gent Management SchoolMaster Computer Science Applied Informatics, Master Computer Science Applied Informatics at Ghent University
Dutch, English, French
Github Skills (5)
html10
css10
website-design9
javascript8
security8
Programming languages (5)
Github contributions (5)
OWASP/samm
Mar 2015 - Sep 2021
SAMM stands for Software Assurance Maturity Model.
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:2 releases, 36 reviews, 382 commits in 6 years 6 months
Contributions summary:Sebastien primarily contributed to the website aspects of the project. They made initial updates to the homepage, modified the header, and altered sponsor-related pages. Additionally, the user updated blog layouts and incorporated changes related to threat modeling, reflecting involvement across various website components and potentially content updates.
maturity-modelowasp-sammmaturity-modelssecuritysaml2
Toreon/threat-model-playbook
Sep 2020 - Jul 2021
Contributions:1 review, 7 commits, 3 PRs in 10 months
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