Senior Director, Mainframe Performance & Capacity (CICS/MVS)

Fidelity Investments; Westlake (TX); On-site; USD 180,000 - 240,000; Full time

Job summary

Fidelity Investments is seeking a Director to lead Mainframe CICS/MVS performance & capacity, delivering technical leadership across performance engineering, scalability, resiliency, and capacity management on the IBM z/OS platform.

You will drive performance analysis, capacity forecasting, and production readiness reviews, coordinating with application, infrastructure, architecture, and vendor teams to balance customer experience with cost and operational simplicity.

Qualifications

• 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 behavior, 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.

Responsibilities

• Lead performance analysis, capacity forecasting, stress-test assessments, and production readiness reviews for the mainframe environment.
• Partner with architecture, infrastructure, and vendor teams to balance customer experience, resiliency, and cost.
• Guide incident investigations, performance reviews, and executive-level communications.

Skills

IBM z/OS

CICS

Capacity planning

Performance analysis

Tools

IntelliMagic

SYSVIEW

OMEGAMON

Grafana

Power BI

SQL

Python

R

Job description

Fidelity Investments is seeking a Director to lead Mainframe CICS/MVS performance & capacity, delivering technical leadership across performance engineering, scalability, resiliency, and capacity management on the IBM z/OS platform.

You will drive performance analysis, capacity forecasting, and production readiness reviews, coordinating with application, infrastructure, architecture, and vendor teams to balance customer experience with cost and operational simplicity.