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# Mainframe Implementation Manager

- **Company:** Whitehall Resources Limited
- **Location:** Sheffield, UK
- **Contract:** Permanent contract
- **Skills:** Customer Information Control System (CICS), Data Migration, IBM DB2, RAID, Job Control Language (JCL), Mainframes, Z/OS, Control M
- **Published:** September 24, 2026
- **Apply:** https://www.collegerecruiter.com/job/2902039111-mainframe-implementation-manager

## About the Role

* Proven Implementation/Cutover/Deployment Management on mainframe or large-scale legacy migrations.

 * Strong understanding of z/OS production operations constraints: batch cycles (JCL), scheduling (e.g., Control-M/CA-7), DB2/IMS considerations, CICS regions, interface dependencies, and resilience/DR practices.

 * Experience running dress rehearsals, coordinating cross-team cutovers, and leading go/no-go forums.

 * Working knowledge of ITIL-aligned change, release, and incident management in regulated environments.

## Description

Whitehall Resources currently require an experienced Mainframe Implementation Manager to work with a key client.

**Please note this role falls INSIDE IR35**

Role purpose: Plan, coordinate, and execute the end-to-end implementation of a mainframe product migration into production, ensuring a controlled, compliant, and low-risk cutover. Own the integrated deployment/cutover plan, readiness, and go/no-go governance across technology, operations, business, and third parties.

Key responsibilities

 * Create and maintain the integrated implementation (deployment/cutover) strategy and plan covering scope, approach (big bang/phased), timeline, dependencies, and critical path.

 * Lead cutover planning: detailed runbooks, rehearsal plans, roles/responsibilities, communications, checkpoints, and contingency/rollback.

 * Coordinate release and change management activities (CAB submissions, implementation approvals, change records, stakeholder signoffs).

 * Drive environment and operational readiness: capacity, access, monitoring, scheduling/batch windows, support model, service transition.

 * Manage data migration implementation activities with clear sequencing, validation steps, reconciliation, and operational controls.

 * Orchestrate dress rehearsals / mock cutovers, capture lessons learned and harden runbooks.

 * Lead implementation governance: readiness reviews, RAID management, decision logs, and executive reporting.

 * Coordinate hyper care/post-go-live: incident triage, defect backlog prioritisation, stabilisation metrics, and handover to BAU.

 * Ensure alignment with risk/compliance/audit requirements (evidence packs, approvals, segregation of duties where required).

 * Manage third parties/vendors involved in deployment (e.g., infrastructure, platform, data, app support, schedulers).

Deliverables (typical)

 * Implementation strategy and Integrated Cutover Plan

 * Detailed cutover runbooks (minute-by-minute where needed)

 * Rehearsal plans and rehearsal outcomes/actions log

 * Change/CAB artefacts and approval pack


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