DB2 z/OS DBA

Our client is a leader in their industry and this is a long-term, multi-year assignment. We are seeking an experienced Senior DB2 z/OS Database Administrator to support and optimize critical enterprise database environments. This role serves as a primary DBA partner for application teams, providing technical guidance, performance tuning, and operational support for high‑availability production systems. The ideal candidate brings deep expertise in DB2 for z/OS, strong performance and tuning skills, and experience supporting complex environments with 24x7 availability requirements. Key Responsibilities Partner with application teams to understand requirements and recommend high‑level database design and implementation approaches Act as the primary DBA contact for application onboarding, upgrades, and major enhancements Monitor and optimize DB2 subsystem performance, including CPU, I/O, buffer pools, locking, and query execution Analyze and resolve performance issues using tools such as Omegamon, EXPLAIN, RMF, SMF, and native DB2 utilities Perform SQL performance tuning and index optimization in collaboration with development teams Plan and execute DB2 maintenance activities including PTFs, service packs, and version upgrades Monitor database health, performance metrics, and security events using built‑in and third‑party tools Configure alerts and proactively identify risks, bottlenecks, and improvement opportunities Ensure high availability, reliability, and compliance for critical production systems Required Qualifications 5-10 years of hands‑on experience as a DB2 for z/OS DBA in large enterprise environments Strong experience supporting mission‑critical, 24x7 production systems Deep knowledge of DB2 z/OS architecture, subsystems, utilities, logging, and recovery Proven expertise in SQL tuning, execution plan analysis, and performance optimization Experience with DB2 monitoring tools such as Omegamon and mainframe performance metrics Strong understanding of z/OS concepts, including datasets, JCL, batch processing, and scheduling Experience coordinating across cross‑functional teams on large‑scale initiatives Solid understanding of SOX audit requirements and database security best practices Preferred Qualifications Experience in manufacturing or highly regulated enterprise environments Strong communication skills with the ability to explain technical concepts to non‑DBA stakeholders Proactive mindset with a focus on stability, performance, and continuous improvement Technology Doesn't Change the World, People Do. ® Robert Half is the world's first and largest specialized talent solutions firm that connects highly qualified job seekers to opportunities at great companies. We offer contract, temporary and permanent placement solutions for finance and accounting, technology, marketing and creative, legal, and administrative and customer support roles. Robert Half works to put you in the best position to succeed. We provide access to top jobs, competitive compensation and benefits, and free online training. Stay on top of every opportunity - whenever you choose - even on the go. Download the Robert Half app and get 1-tap apply, notifications of AI-matched jobs, and much more. All applicants applying for U.S. job openings must be legally authorized to work in the United States. Benefits are available to contract/temporary professionals, including medical, vision, dental, and life and disability insurance. Hired contract/temporary professionals are also eligible to enroll in our company 401(k) plan. Visit roberthalf.gobenefits.net for more information. © 2025 Robert Half. An Equal Opportunity Employer. M/F/Disability/Veterans. By clicking "Apply Now," you're agreeing to Robert Half's Terms of Use and Privacy Notice .