> Markdown version of [/jobs/ext/2251136-mainframe-db2-z-os-dba-systems-administrator](https://www.wearedevelopers.com/jobs/ext/2251136-mainframe-db2-z-os-dba-systems-administrator). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Mainframe DB2 z/OS DBA / Systems Administrator - **Company:** Centillion Infotech - **Location:** Dallas, TX, United States (Remote available) - **Experience:** Expert - **Contract:** Permanent contract - **Skills:** Application Performance Management, Batch Processing, Customer Information Control System (CICS), CLIST, System Configuration, Data Integration, Extract Transform Load (ETL), IBM DB2, Linux, Disaster Recovery, Monitoring of Systems, Job Control Language (JCL), IBM Mainframe, IBM WebSphere MQ, Rexx (Programming Language), Tivoli Management Framework, Job Entry Subsystem 2/3, Linux System Administration, Mainframes, Performance Tuning, IBM Resource Access Control Facility, Release Management, Security Support Provider Interface, SQL Databases, Subsystems, Z/OS, Data Logging, Tso/ispf, Sql Optimization, System Availability, Change Data Capture, Ibm Z/vm, Performance Monitor, Omegamon, Control M - **Published:** August 26, 2026 - **Apply:** https://www.dice.com/job-detail/c002bf16-8e17-42c5-b627-b96bf5dade43 ## About the Role We are seeking a highly experienced Senior Mainframe DB2 z/OS DBA / Systems Administrator with strong hands-on expertise across the IBM Mainframe ecosystem. The ideal candidate will have deep experience with DB2 for z/OS combined with strong z/OS systems and infrastructure skills, including RACF, CICS, IBM MQ, z/VM, z/Linux, SMP/E, system maintenance, performance monitoring, security, storage, and production support. This is a highly technical role. The primary focus is on hands-on Mainframe technical expertise, troubleshooting, administration, performance, availability, and production support. Project management experience is a plus but is secondary to technical capability., Experience with: * REXX * CLIST * JCL * TWS/OPC * Control-M * SA z/OS * NetView * Mainframe automation and operational scripting ## Description * Install, configure, maintain, upgrade, and support DB2 for z/OS subsystems. * Administer production and non-production DB2 environments. * Perform DB2 subsystem maintenance, upgrades, migrations, and configuration changes. * Apply DB2 and related Mainframe maintenance using SMP/E. * Execute and optimize DB2 utilities including: + REORG + RUNSTATS + COPY + RECOVER + LOAD + REBUILD INDEX * Monitor and tune DB2 subsystems, SQL, buffer pools, locking, logging, storage, and application performance. * Perform DB2 performance analysis and SQL optimization. * Support backup, recovery, high availability, and disaster recovery activities. * Participate in disaster recovery testing and recovery validation. * Troubleshoot complex DB2 production issues and perform root-cause analysis. Mainframe / z/OS Systems Administration * Provide hands-on administration and operational support for IBM z/OS / MVS environments. * Monitor system health, availability, CPU, memory, workloads, batch processing, storage, and subsystem performance. * Support IPL/POR, system startup/shutdown, started tasks, JES and batch processing. * Perform z/OS maintenance, upgrades, patching, and system configuration activities. * Work with PARMLIB, PROCLIB, TSO/ISPF, SDSF, JES2/JES3, JCL, and z/OS utilities. * Support SMP/E RECEIVE/APPLY/ACCEPT, PTF maintenance, HOLDDATA review, and USERMOD activities. * Troubleshoot complex system, subsystem, batch, storage, and production incidents. * Support enterprise Mainframe availability and high-availability environments. RACF / Mainframe Security * Provide hands-on RACF administration and security support. * Administer users, groups, profiles, permissions, and protected resources. * Perform access reviews, privilege validation, and security troubleshooting. * Support RACF audits, compliance activities, security hardening, and remediation. * Collaborate with security teams to resolve access-control and authorization issues. CICS / IBM MQ * Support CICS environments and troubleshoot CICS-related production issues. * Collaborate with application and infrastructure teams on CICS availability, performance, and transaction issues. * Support IBM MQ / MQSeries environments and troubleshoot messaging issues. * Monitor and troubleshoot queues, message processing, connectivity, and integration issues. * Work across CICS, DB2, MQ, application, network, and infrastructure teams to resolve complex production incidents. z/VM / z/Linux * Support IBM z/VM environments and related Mainframe infrastructure. * Support Linux on IBM Z / z/Linux environments and integration with the broader Mainframe ecosystem. * Troubleshoot operating-system, connectivity, storage, workload, and infrastructure issues across z/OS, z/VM, and z/Linux environments. * Collaborate with platform, infrastructure, storage, network, and security teams on cross-platform issues. Replication & Data Integration * Support Q Replication, SQL Replication, and Change Data Capture (CDC). * Support DB2 Connect and related DB2 connectivity. * Support Informatica PowerExchange where required. * Troubleshoot data movement, replication, connectivity, and integration issues. Performance & Monitoring Experience with one or more of the following is preferred: * OMEGAMON * IntelliMagic * MXG * BMC MainView * Apptune * Query Monitor * TMON * Strobe * Db2PM * RMF/SMF * SDSF Responsibilities include: * Monitor DB2 and z/OS performance. * Analyze CPU, memory, I/O, storage, workload, locking, and subsystem performance. * Identify performance bottlenecks and recommend corrective actions. * Support capacity planning and performance optimization. Automation & Scheduling, Use automation to improve system monitoring, maintenance, reporting, health checks, and repetitive operational activities. Production Support & ITIL * Provide 24x7 / rotational on-call production support. * Act as a technical escalation point for high-severity incidents. * Perform detailed root-cause analysis and develop permanent corrective actions. * Follow ITIL processes for: + Incident Management + Problem Management + Change Management + Release Management * Support major incidents and production recovery activities. * Maintain SOPs, runbooks, implementation plans, technical documentation, and operational procedures. ## Related Videos - [Docker network without Docker](https://www.wearedevelopers.com/videos/1418-docker-network-without-docker) - [".Net is too slow" was not an option](https://www.wearedevelopers.com/videos/100176-net-is-too-slow-was-not-an-option) - [Docker exec without Docker](https://www.wearedevelopers.com/videos/1094-docker-exec-without-docker) - [Building with IBM Bob](https://www.wearedevelopers.com/videos/100275-building-with-ibm-bob) - [Migrating from COBOL with AI: A Moonshot Demo](https://www.wearedevelopers.com/videos/1531-migrating-from-cobol-with-ai-a-moonshot-demo) - [Discover the open source trio you didn’t expect: .NET and PostgreSQL on Linux](https://www.wearedevelopers.com/videos/2042-discover-the-open-source-trio-you-didn-t-expect-net-and-postgresql-on-linux) ## Related Articles - [How We Built a Worry-Free System That Runs for 10+ Years – And What We’d Do Again](https://www.wearedevelopers.com/magazine/751-how-we-built-a-worry-free-system-that-runs-for-10-years-and-what-we-d-do-again) - [The Best Job Search Websites of 2025](https://www.wearedevelopers.com/magazine/368-the-best-job-search-websites-of-2025) - [Top Big Data Technologies That You Need to Know](https://www.wearedevelopers.com/magazine/108-top-big-data-technologies-that-you-need-to-know) - [Is Software Engineering Over-Saturated?](https://www.wearedevelopers.com/magazine/418-is-software-engineering-over-saturated) - [Data Analyst Salary in Switzerland](https://www.wearedevelopers.com/magazine/276-data-analyst-salary-in-switzerland) - [Highest Paying Tech Companies for Developers](https://www.wearedevelopers.com/magazine/220-highest-paying-tech-companies-for-developers)