Implementation Manager - Mainframe Product Migration

Req ID: 390892 Competitive salary | UK: hybrid: Sheffield OR London + remote At NTT DATA, we know that with the right people on board, anything is possible. The quality, integrity, and commitment of our employees are key factors in our company’s growth, market presence and our ability to help our clients stay a step ahead of the competition. By hiring the best people and helping them grow both professionally and personally, we ensure a bright future for NTT DATA and for the people who work here. NTT DATA is currently looking for an Implementation Manager - Mainframe Product Migration on a hybrid work model (Sheffield or London + remote) for our growing team in the UK. 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 Readiness criteria, go/no-go checklist, and decision log Hypercare plan, support model, and BAU handover pack Implementation closure report and lessons learned Required experience 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. Key skills & behaviours Excellent planning and dependency management; strong “get it done” execution bias. Clear, calm leadership during high-pressure cutover windows. Strong stakeholder management across technology, operations, business, risk/compliance, and suppliers. Crisp written communication: executive updates, RAID, and runbook clarity. Tools/skills Planning: MS Project/Smartsheet/Jira/Confluence Change/ITSM: ServiceNow (or equivalent) Reporting: Excel Benefits Our people are the most critical component of our long-term success and their health and wellbeing are our priority. You will enjoy a comprehensive, locally competitive benefits package. About NTT DATA NTT DATA is a $30 billion business and technology services leader, serving 75% of the Fortune Global 100. We are committed to accelerating client success and positively impacting society through responsible innovation. We are one of the world's leading AI and digital infrastructure providers, with unmatched capabilities in enterprise-scale AI, cloud, security, connectivity, data centers and application services. our consulting and Industry solutions help organizations and society move confidently and sustainably into the digital future. As a Global Top Employer, we have experts in more than 50 countries. We also offer clients access to a robust ecosystem of innovation centers as well as established and start-up partners. NTT DATA is a part of NTT Group, which invests over $3 billion each year in R&D. Whenever possible, we hire locally to NTT DATA offices or client sites. This ensures we can provide timely and effective support tailored to each client’s needs. While many positions offer remote or hybrid work options, these arrangements are subject to change based on client requirements. For employees near an NTT DATA office or client site, in-office attendance may be required for meetings or events, depending on business needs. At NTT DATA, we are committed to staying flexible and meeting the evolving needs of both our clients and employees. NTT DATA recruiters will never ask for payment or banking information and will only use @nttdata.com, @nttdatafed.com and @talent.nttdataservices.com email addresses. If you are requested to provide payment or disclose banking information, please submit a contact us form, . NTT DATA endeavors to make accessible to any and all users. If you would like to contact us regarding the accessibility of our website or need assistance completing the application process, please contact us at . This contact information is for accommodation requests only and cannot be used to inquire about the status of applications. NTT DATA is an equal opportunity employer. Qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability or protected veteran status. For our EEO Policy Statement, please click here . If you'd like more information on your EEO rights under the law, please click here . For Pay Transparency information, please click here . #LI-NorthAmerica