Job Description

Work Schedule

Other

Environmental Conditions

Office

As part of the Thermo Fisher Scientific team, you'll discover meaningful work that makes a positive impact on a global scale. Join our colleagues in bringing our Mission to life every single day to enable our customers to make the world healthier, cleaner and safer. We provide our global teams with the resources needed to achieve individual career goals while helping to take science a step beyond by developing solutions for some of the world's toughest challenges, like protecting the environment, making sure our food is safe or helping find cures for cancer.

Job Summary

The Senior Mainframe Operator provides advanced operational support for mission-critical mainframe environments, ensuring high availability, performance, and reliability of enterprise systems. This role acts as a technical escalation point within operations, mentors junior operators, and collaborates closely with system programmers, application teams, and infrastructure support groups to maintain stable production processing.

Key Responsibilities

Lead day-to-day operation and monitoring of

IBM z/OS mainframe systems

in a 24x7 production environment Serve as the

primary escalation point

for complex operational incidents and system abnormalities Monitor and manage

batch processing

, online regions, and system resources to meet SLAs Analyze console messages, job failures, abends, and performance alerts; take corrective action or escalate appropriately Execute and oversee

IPL procedures, system restarts, and recovery activities

following approved runbooks Coordinate closely with

system programmers

during maintenance windows, upgrades, and incident resolution Manage and optimize workload scheduling using tools such as CA7 and CSAR. Ensure successful execution of

backup, recovery, and disaster recovery

processes Maintain and improve operational documentation, runbooks, and shift handover procedures Mentor and guide junior operators; provide on-the-job training and operational best practices Enforce adherence to

change management, security, audit, and compliance requirements

Participate in problem management, root cause analysis, and continuous improvement initiatives

Required Skills & Qualifications

Bachelor's degree in Information Technology, Computer Science, or equivalent professional experience

5+ years

of hands-on experience in mainframe operations Strong working knowledge of: + IBM

z/OS

+

JCL

, JES2/JES3
+

TSO/ISPF

+ Batch scheduling and automation tools
Proven ability to troubleshoot production issues under pressure Strong understanding of operational controls, SLAs, and incident escalation processes Excellent written and verbal communication skills

Preferred Qualifications

Experience supporting

large-scale, high-availability mainframe environments

Working knowledge of mainframe storage (DASD, tape, SMS concepts) Familiarity with mainframe security tools such as

RACF, and ACF2.

Experience with

ITIL-based operations

, incident/problem/change management Exposure to automation scripting or workload optimization initiatives

Work Environment

24x7 shift-based operations, including on-call responsibilities High-impact role supporting business-critical applications * Requires strong decision-making skills during incidents and outages