According to these tasks, what should my headline be?

yzT

My contract doesn't have any job title specified, it just says "Category: Engineer".

The idea of my employer was that I was going to be another sysadmin, however in less than a week I started to be the solely responsible for security tasks. No one tell me what to do nor I tell someone to do anything, it's like I'm the alone wolf within the sysadmins team. I choose what to implement and if there are available resources, I have permission from management to do so.

My daily duties are:

- Implementation and configuration of SIEM, HIDS, NIDS, firewall.
- Servers hardening.
- Deal with server compromises.
- Manage accounts privileges.

So regarding to those tasks, what should I type as my headline?

Verities

I've had friends in similar situations (one doing IT work at a university and they gave him the title of "Assistant Professor", he just put "Network Administrator" on his resume for that position). I would go with: Security Analyst, System Security Analyst, or Information Assurance Analyst. If you are actually doing design work as well then you should Security Engineer, since design work falls under that category.