We are currently supporting a key client on a strategic initiative and are looking for an experienced Mainframe System Engineer (Medior to Senior level) to join a dedicated mission within a critical z/OS environment.
Assignment Overview:
This is a dedicated freelance assignment (or CDI via portage) with an initial duration of 6 to 12 months, with strong potential for extension depending on client needs and project evolution.
The role is focused on Mainframe transformation, migration, and upgrade projects, including infrastructure modernization and system enhancements.
Location: On-site presence is mandatory
Conditions:
Availability for weekend work (overtime may be required)
High-demand environment requiring strong stress management capabilities
Key responsibilities
Actively contribute to Mainframe LPAR migrations, specifically from z16 to z17
Manage and optimize z/OS environments
Work closely with IBM teams on Hardware configuration and setup
Lead or support migration of Mainframe tools, particularly from Broadcom solutions to IBM or BMC software
Participate in operating system upgrades and ongoing maintenance activities
Contribute to upgrades of third-party software (DB2, CICS, Cobol, IBM MQ, IWS, etc.)
Ensure stability, performance, and reliability of critical systems
Operate within structured IT processes aligned with ITIL standards
Required skills & experience
Proven experience as a Mainframe System Engineer (Medior or Senior level)
Deep expertise in z/OS (mandatory)
Demonstrated experience with Mainframe LPAR migration (z16 to z17)
Strong background in Hardware configuration in collaboration with IBM
Experience with Mainframe tool migration (Broadcom to IBM or BMC environments)
Strong involvement in OS and software upgrade projects
Solid knowledge of Mainframe ecosystems and third-party tools
ITIL knowledge is mandatory
Fluency in English is mandatory (written and spoken)
Soft skills
Excellent communication skills, both written and verbal
Ability to work under pressure in highly critical environments
Strong sense of ownership and accountability
Proactive, autonomous, and solution-oriented mindset
Team player with strong collaboration skills