Title: DB2 Mainframe Z/OS Expert Location: 100% Remote work Duration : Long Term Contract Job Requirements: · Must have experience with V13 and can speak in more detail on DSNZPARM recommendations and software deployment and backout considerations. · Must be a very seasoned, highly skilled resource with preferably experience migrating to DB2 V13 or at least setting it up for migration. · 10+ years of hands-on Db2 for z/OS engineering, administration, architecture, performance tuning, recovery, and production support experience in large enterprise Sysplex and data sharing environments · Expert knowledge of Db2 for z/OS subsystem internals, including IRLM, DDF, EDM pools, buffer pools, logging, utilities, packages, plans, WLM interactions, and z/OS dependencies · Demonstrated experience configuring, governing, and tuning DSNZPARM settings across development, test, and production environments · Proven experience supporting Db2 data sharing groups, including group buffer pool strategy, coupling facility interactions, member balancing, lock contention analysis, restart/recovery behavior, high availability, and disaster recovery procedures · Strong understanding of Db2 security architecture, including RACF integration, authentication, authorization, trusted contexts, privileged access controls, SECADM/SYSADM separation, audit traces, encryption, certificates, and secure remote connectivity · Experience performing Db2 software lifecycle management, including SMP/E, PTF evaluation, RSU planning, APAR analysis, ++HOLDDATA review, vendor advisory assessment, maintenance windows, fallback planning, and deployment governance · Ability to assess vulnerability findings, CVE applicability, security bulletins, patch exposure, configuration drift, exploitability, compensating controls, remediation complexity, and implementation risk for Db2 for z/OS environments · Experience identifying software risk exposures, attack surface, control gaps, operational weaknesses, and remediation opportunities across Db2, z/OS, RACF, DDF, utilities, middleware interfaces, certificates, and automation tooling