Mainframe Administrator

IPolarity

Mainframe DB2 Systems Administrator responsible for managing DB2 for z/OS subsystems in a mission-critical environment. Role involves installation, tuning, and support of DB2 subsystems with high availability and performance optimization.

Posted 7/16/2026part-timePhoenix • Arizona, Florida, Illinois, New Jersey, North Carolina, Texas, Virginia • 🇺🇸 United StatesSeniorLeadWebsite

Core Competencies

Role fit

Core Competencies

Use this summary to align your resume positioning with the role.

Demonstrates extensive expertise in managing and supporting DB2 for z/OS subsystems, including installation, configuration, and performance optimization. Proficient in troubleshooting system-level issues and ensuring DB2 availability through effective disaster recovery strategies.

Highest-signal resume keywords

DB2 Systems ProgrammingMainframe ExperiencePerformance TuningTroubleshooting SkillsJCL Proficiency

ATS Keywords

Tailor your resume

Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills

DB2 for z/OSZPARMsBuffer PoolsLogsBSDSCatalogSMP/EVersion UpgradesPatch ManagementRoot Cause Analysis

Soft Skills

Problem SolvingAnalytical Thinking

Tools & Technologies

JCLTSO/ISPFSDSFIBM DB2 Replication Products

Industry Keywords

Mission-Critical EnvironmentDisaster RecoveryCapacity PlanningSysplexSystem Maintenance

Tech Stack

Tools & technologies

Distributed Systems

About the role

Key responsibilities & impact

Manage and support DB2 for z/OS subsystems in a mission-critical enterprise environment
Install, configure, and maintain DB2 for z/OS subsystems
Perform version upgrades, patching (PTFs/APARs), and system maintenance
Manage subsystem configuration and initialization parameters
Maintain core DB2 components: ZPARMs (DSNZPARM), Buffer pools, Logs and BSDS, Catalog and directory
Monitor and tune DB2 system-level performance (CPU, memory, I/O)
Optimize: Buffer pools, Locking and concurrency, Thread and connection performance
Support capacity planning and performance analysis using DB2 and system tools
Manage and support DB2 Data Sharing environments (Sysplex)
Ensure DB2 availability and resilience through DR strategies
Analyze and resolve subsystem failures, connectivity issues affecting DB2 operations
Perform root cause analysis and implement preventive actions
Support interaction with: Batch (JCL), CICS, IMS, MQ and distributed systems

Requirements

What you’ll need

7–12+ years of mainframe experience
3–5+ years in DB2 Systems Programming / Administration
Experience with IBM DB2 for z/OS and Replication products (Qrep, SQLrep and CDC) - software installation, version upgrades and maintenance, certification testing, documentation of operational procedures, disaster recovery testing
Deep knowledge of: ZPARMs and subsystem configuration
Buffer pools, logs, BSDS, catalog/directory
Strong troubleshooting skills for: System-level DB2 issues
Performance and connectivity problems
Proficiency in: JCL, TSO/ISPF, SDSF
SMP/E (preferred)

Benefits

Comp & perks

Flexible work from home options