Mainframe Night Operator

Prisma is the trusted industry platform powering the future of advertising. We connect media, technology, and data to enable marketers and agencies to plan, buy, and measure across all channels—
with precision, automation, and intelligence
. Our AI-driven solutions optimize workflows, unlock insights, and deliver measurable outcomes for the world’s leading brands and agencies.

As a Mainframe Night Operator, you’ll play a critical role in ensuring the smooth operation of Mediaocean’s mainframe systems during overnight hours. You’ll monitor system performance, run production processes for both EU and US systems, and serve as the first line of defense in identifying and diagnosing technical issues. Ideal candidates are technically proficient, calm under pressure, and confident communicators who can collaborate effectively with senior and on-call support staff to resolve incidents and maintain operational excellence.

Responsibilities will include:

• Operate z/OS JES3 operating system
• Have sufficient technical expertise to monitor/maintain required customer response at all times
• First level of error detection and diagnosis of all response time issues
• Run daytime & nighttime production for EU & US systems
• First level of error detection and diagnosis in all daily processes
• Highlight and report on any failures, problem areas and incidents via Ops tickets
• Maintain and monitor Ops ticket database and assign all tickets
• Understand z/OS JCL and be able to perform initial problem diagnosis on failures
• Produce clear incident reports and work logs via the ops ticket system
• Communicate clearly and concisely with senior staff and on-call support staff during the problem resolution process

• Have sufficient technical expertise of z/OS, JES2 or JES3 operating systems, and related operating programs and facilities to effectively operate the Mediaocean mainframe system (TSO, ISPF, Ejes/SDSF, JCL, Beta
  92)
• Work with self-initiative
• Problem solving abilities
• Knowledge of BMC AMIOPS, MAINVIEW and Control-M Tape would be an advantage
• Knowledge of Jes3 DJC networking would be an advantage

• Flexible Working (Hybrid)
• 27 days annual leave plus bank holidays
• Private Medical Health Insurance
• Pensions Scheme & Life Insurance
• Budget for professional development costs
• Season Ticket Loan Scheme
• Cycle to work scheme
• Give as you earn
• Eye test & occupational glasses reimbursement
• Classpass
• Nursery Scheme
• Employee Assistance Programme
• Professional development opportunities within our Learning & Development programs
• Belong@Mediaocean affinity based groups of colleagues to create community
• All of these benefits/perks are effective on the date of hire

This position follows a rotating overnight schedule consisting of 12-hour shifts from 8:00 PM – 8:00 AM, working 7 consecutive days (Thursday–Wednesday) followed by 7 consecutive days off. The middle shift of the rotation (Saturday) is a compulsory overtime day.

We would hate to miss out on your application because you do not meet every requirement – transferrable skills and education will also be considered, so please do not hesitate to apply!

Mediaocean recognizes our true strength and value shine when all our team members feel there is space in the conversation for their voices, thoughts, ideas, perspectives, and concerns. Mediaocean is committed to being an equal opportunity employer, and we consider all applicants regardless of their age, race, color, gender, sexual orientation, ethnicity, religion, national origin, disability, or veteran status.