senior technology architect.

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.

Location: Toronto, ON (Hybrid options available)

Duration: 10-month contract

Advantages
Enterprise Infrastructure Domain: Gain elite exposure managing the capacity lifecycle and business-continuity architecture for a massive public-sector mainframe footprint.

Strategic Financial Influence: Directly drive computational cost-containment initiatives and optimize sub-capacity software licensing models.

Greenfield DR Exposure: Play a vital architectural role establishing operational baselines for a newly acquired, highly secure disaster recovery facility.

Diverse Technical Liaison: Partner dynamically across software engineering squads, hardware fabrication vendors, and top-tier infrastructure directors.

Responsibilities
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.

Qualifications
Core Seniority: Minimum of 7 years of dedicated, hands-on experience in Mainframe Performance and Capacity Management roles within massive enterprise environments.

Platform Architecture Depth: Firm structural understanding of IBM Mainframe CPU concepts, including Capacity BackUp (CBU) provisioning and Capacity on Demand (CoD) adjustments.

Tooling Specialization: Proven, advanced capability configuring and reporting via MICS, RMF, and associated ISV performance monitors.

Data Engine Capabilities: Deep familiarity parsing SMF records combined with practical SAS programming skills for processing massive performance datasets.

Subsystem Literacy: Sound knowledge of database/transaction subsystem resource footprints, particularly IMS and DB2.

Incident Governance: Well-versed in ITIL-aligned Incident and Problem Management frameworks, with an ability to strictly adhere to enterprise Service Level Agreement (SLA) metrics.

Summary
If you're interested in the Senior Technology Architect (Mainframe Performance & Capacity Management) role based in Toronto, we encourage you to apply online at Only qualified candidates will be contacted for the next steps. We look forward to hearing from you!

Randstad Canada is committed to fostering a workforce reflective of all peoples of Canada. As a result, we are committed to developing and implementing strategies to increase the equity, diversity and inclusion within the workplace by examining our internal policies, practices, and systems throughout the entire lifecycle of our workforce, including its recruitment, retention and advancement for all employees. In addition to our deep commitment to respecting human rights, we are dedicated to positive actions to affect change to ensure everyone has full participation in the workforce free from any barriers, systemic or otherwise, especially equity-seeking groups who are usually underrepresented in Canada's workforce, including those who identify as women or non-binary/gender non-conforming; Indigenous or Aboriginal Peoples; persons with disabilities (visible or invisible) and; members of visible minorities, racialized groups and the LGBTQ2+ community.

Randstad Canada is committed to creating and maintaining an inclusive and accessible workplace for all its candidates and employees by supporting their accessibility and accommodation needs throughout the employment lifecycle. We ask that all job applications please identify any accommodation requirements by sending an email to View email address on randstad.com to ensure their ability to fully participate in the interview process.

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