Johan Sydseter

Johan Sydseter

Johan (Uncle Joe) Sydseter - The guy with the long hair, not the beard

Johan Sydseter is an Application Security Engineer at Admincontrol AS, a subsidiary of Euronext, and one of the leaders of OWASP Cornucopia and the co-creator of OWASP Cornucopia Mobile App Edition and Companion Edition. He is a living AppSec Pokemon, application security engineer, developer, architect and DevOps practitioner. He has worked on building and designing secure backend and frontend solutions for a lifetime. He is also a contributor to OWASP ASVS, -MASTG, .DevGuide, Cheat Sheets and Threat Dragon. He has given several presentations on application security at various international conferences.

Join us in Amsterdam!

November 19, 2026

Hang out, learn something awesome and make new friends.

Get Tickets