Network and Application Security Specialist

I'm seeking a cyber security expert experienced in application and network security. I have a task in which you have to draw an attack tree by choosing some organization and ellaborate about that. I will share the complete document as well.
Experience with specific security tools, industry, or managing certain network size hasn't been specified but do bring forth any you deem relevant to this role. Less is more, so please keep your information relevant and concise.