Oskar Krizanec
Senior Technical Support Professional | z/OS
Salary / Daily rate
Zagreb, Croatia
Freelance
Can come onsite
Skills
About me
Intro
Senior z/OS mainframe specialist with 16+ years of expertise in enterprise systems and security solutions. Led security and infrastructure departments managing critical tools including CyberArk, IBM Guardium, and Rapid7, while maintaining deep technical proficiency in WebSphere, DB2, and mainframe environments. Deliver robust enterprise solutions combining mainframe architecture knowledge with modern security practices for mission-critical systems.
Work experience
Senior Technical Support Professional for z/OS
IBM
Jan 2022 - Present
4 years 10 months
Zagreb, Croatia
APIS IT d.o.o.
Nov 2008 - Jan 2022
13 years 3 months
Zagreb, Croatia
Head of Security Solutions Management & Central System (mainframe) Department
Jun 2018 - Jan 2022
3 years 8 months
Zagreb, Croatia
z/OS RACF, CICS, CTG, IMS, WebSphere DB2, MQ, REXX BMC Control-M CyberArk Rapid7 Nexpose InsightVM Cisco Email Security Appliance Cisco Advanced Phishing Protection Symantec ProxySG IBM Security Guardium ...
Head of Infrastructure Management and Monitoring Department
Jan 2017 - Jul 2018
1 year 7 months
Zagreb, Croatia
Head of Application Support Department
Jul 2015 - Jan 2017
1 year 7 months
Zagreb, Croatia
System Engineer
Nov 2008 - Jul 2015
6 years 9 months
Middleware on z/OS, Websphere Application server, Business Process Management, WebSphere MQ, Broker.
Software developer
Lemax d.o.o.
May 2008 - Aug 2008
4 months
web developer - ASP.NET, MS SQL Server
Food Team Member
Valleyfair Family Amusement Park
Jun 2007 - Oct 2007
5 months
Shakopee, MN, USA
Education
Faculty of Electrical Engineering and Computing, University of Zagreb
univ. spec. secur. inf. - university specialist of security information, Computer and Information Systems Security/Information Assurance
2012 - 2014
3 years
Faculty of Electrical Engineering and Computing, University of Zagreb
dipl.ing. (Master), Computing
2002 - 2008
7 years
Licenses & certifications
CyberArk Certified Trustee
Issued: Dec 2025