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Randstad Logo Randstad · IT - Administration

Senior Technology Architect

Canada, Toronto · Job Posted June 01, 2026
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Job Description

We are seeking an expert Senior Technology Architect specializing in IBM Mainframe Performance and Capacity Management to act as a principal subject matter expert. In this role, you will sustain critical Keep-The-Lights-On (KTLO) operations, drive large-scale post-migration stabilization activities, and architect infrastructure readiness for a newly acquired Disaster Recovery (DR) co-location site. This position requires a highly technical professional capable of analyzing complex platform metrics, executing data-driven optimization strategies, and managing multi-partitioned enterprise environments to identify processing cost savings.

Job Responsibility

  • Capacity Planning & Assessment: Author, review, and maintain comprehensive capacity planning documents for the mainframe platform and IMS/DB2 subsystems. Perform complex 'what-if' impact modeling for CPU upgrades, hardware refreshes, and project workload variations
  • Metric Modeling & Calculations: Execute mathematical conversions and estimations to measure workload impacts in terms of $MIPS$ (Millions of Instructions Per Second) and $MSUs$ (Million Service Units) across complex, multi-partitioned LPAR environments
  • Tooling & Report Configuration: Configure, manage, and extract reporting insights from interactive capacity management utilities, specifically MICS (MVS Information Control System) and RMF (Resource Measurement Facility)
  • Data Logging Analysis: Parse, analyze, and manipulate System Management Facility (SMF) data utilizing SAS Programming frameworks to optimize subsystem throughput and manage zIIP engine utilization
  • Cost Optimization & Software Billing: Proactively identify CPU cost-saving opportunities, implement workload capping or balancing strategies, and reconcile mainframe software consumption billing for Independent Software Vendor (ISV) licenses
  • Disaster Recovery & Hardware Provisioning: Lead architectural installation, validation, and testing tracks for the new mainframe hardware platform at the DR co-location site. Participate in periodic live DR exercises to maintain total systems readiness
  • Incident Architecture & Root-Cause Analysis: Diagnose complex systemic failures, provide tier-3 operational support, and compile precise technical Method of Procedure (MOP) documentation along with root-cause system captures
  • Vendor & Lifecycle Management: Provide migration, modernization, and decommissioning architecture support for mainframe system utilities. Collaborate directly with tier-1 hardware/software vendors and cross-functional IT infrastructure leads

Requirements

  • Minimum of 7 years of dedicated, hands-on experience in Mainframe Performance and Capacity Management roles within massive enterprise environments
  • Firm structural understanding of IBM Mainframe CPU concepts, including Capacity BackUp (CBU) provisioning and Capacity on Demand (CoD) adjustments
  • Proven, advanced capability configuring and reporting via MICS, RMF, and associated ISV performance monitors
  • Deep familiarity parsing SMF records combined with practical SAS programming skills for processing massive performance datasets
  • Sound knowledge of database/transaction subsystem resource footprints, particularly IMS and DB2
  • Well-versed in ITIL-aligned Incident and Problem Management frameworks, with an ability to strictly adhere to enterprise Service Level Agreement (SLA) metrics
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