Director, Mainframe CICS/MVS Performance and Capacity

Job Description Note: Fidelity will not provide immigration sponsorship for this position. The Role As Director, Mainframe CICS/MVS Performance & Capacity, you will provide technical leadership for performance engineering, scalability, resiliency, and capacity management across Fidelity's IBM z/OS platform. This role is responsible for analyzing and optimizing complex online and batch workloads spanning CICS, MQ, WAS, DB2, VSAM, storage, network, and cloud-to-mainframe integration environments. You will lead performance analysis, capacity forecasting, stress-test assessments, modernization measurement, and production readiness reviews to ensure platform stability and business continuity. Partnering across application, infrastructure, architecture, and vendor teams, you will evaluate the impact of technology changes on workload behavior and develop recommendations that balance customer experience, resiliency, operational simplicity, and cost. As a hands-on technical leader, you will guide high-severity incident investigations, performance reviews, and strategic initiatives while translating complex technical findings into meaningful insights and recommendations for senior leadership. The Expertise & Skills You Bring 10+ years of experience in IBM z/OS environments with deep expertise in CICS, MVS/zOS performance engineering, capacity planning, systems programming, middleware, or infrastructure engineering. Strong knowledge of CICS transaction processing, region behaviour, response-time analysis, workload management, transaction attribution, VSAM access patterns, and interactions with DB2, MQ, WAS, and batch processing environments. Deep understanding of IBM z/OS, Parallel Sysplex, WLM, PR/SM, LPAR configuration, GP/zIIP optimization, storage management, JES/batch processing, DASD/FICON, and platform resiliency. Experience using SMF, RMF, CICS performance data, and tools such as IntelliMagic, SYSVIEW, OMEGAMON, Strobe, MXG/SAS, Grafana, Power BI, SQL, Python, R, or equivalent platforms to analyze and optimize system performance. Proven ability to develop capacity forecasts and workload models that align business growth, transaction volumes, modernization initiatives, and infrastructure demand with future platform requirements. Experience leading performance governance, incident management, root-cause analysis, change management, and production support within large-scale, mission-critical environments. Strong analytical and problem-solving skills with the ability to identify root causes across application, middleware, operating system, storage, network, and infrastructure layers. Proven leadership and communication skills with the ability to influence technical and business stakeholders, translate complex findings into executive-level recommendations, and mentor engineering teams. The Team The Mainframe Capacity & Performance team is responsible for performance engineering, capacity planning, forecasting, monitoring, and configuration optimization across Fidelity's enterprise IBM z Systems environment. The team partners closely with Mainframe Hosting, CICS, DBMS, MQ, Storage, Network, Application Development, Architecture, and key technology vendors to ensure the reliability, scalability, and resiliency of critical business applications and infrastructure. Together, we provide the technical expertise, performance insights, and strategic guidance necessary to support business growth, major modernization initiatives, and operational excellence across the enterprise. Fidelity’s Onsite Working Model Fidelity is transitioning to a full-time onsite working model through a phased rollout across regions and roles. Currently, some roles and locations require 100% onsite presence, while others require less. Onsite expectations are likely to evolve as the rollout continues. This transition does not apply to fully remote roles. Certifications Category: Information Technology Legal and Compliance Statement Please be advised that Fidelity’s business is governed by the provisions of the Securities Exchange Act of 1934, the Investment Advisers Act of 1940, the Investment Company Act of 1940, ERISA, numerous state laws governing securities, investment and retirement-related financial activities and the rules and regulations of numerous self-regulatory organizations, including FINRA, among others. Those laws and regulations may restrict Fidelity from hiring and/or associating with individuals with certain Criminal Histories. At Fidelity, we are passionate about making our financial expertise broadly accessible and effective in helping people live the lives they want! We are a privately held company that places a high degree of value in creating and nurturing a work environment that attracts the best talent and reflects our commitment to our associates. We are proud of our diverse and inclusive workplace where we respect and value our associates for their unique perspectives and experiences. For information about working at Fidelity, visit FidelityCareers.com. Equal Opportunity and Accommodation Fidelity Investments is an equal opportunity employer. Fidelity will reasonably accommodate applicants with disabilities who need adjustments to participate in the application or interview process. To initiate a request for an accommodation please contact the following: For roles based in the US: Contact the HR Leave of Absence/Accommodation Team by sending an email to View email address on click.appcast.io, or by calling View phone number on click.appcast.io, prompt 2, option 2. For roles based in Ireland: Contact View email address on click.appcast.io. 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