Principal Mainframe Performance & Capacity Lead

Fidelity Investments Inc.; Westlake (TX); On-site; USD 150,000 - 210,000; Full time

Job summary

Fidelity Investments Inc. is seeking a Principal Engineer in the Mainframe Capacity and Performance Engineering organization to analyze, monitor, and improve the performance of critical middleware platforms that support Fidelity's core business applications.

You will identify bottlenecks, perform capacity analysis, and support incident investigations across IBM mainframe technologies. Collaborating with application, infrastructure, and engineering teams, you will deliver automation, dashboards,

Qualifications

• 7+ years of experience supporting performance engineering, capacity management, systems programming, production engineering, or application infrastructure in large-scale enterprise environments
• Hands-on experience with one or more IBM mainframe middleware platforms, including CICS, IBM MQ, WebSphere Application Server (WAS), Liberty, Compute Grid, Kafka integrations, or Operational Decision Manager (ODM)
• Strong understanding of z/OS performance data, including SMF/RMF metrics, memory management, Coupling Facility services, log streams, and subsystem interactions
• Experience using performance and observability tools such as IntelliMagic, SYSVIEW, SAS/MXG, Grafana, Datadog, Prometheus, PostgreSQL, VictoriaMetrics, or similar platforms
• Ability to analyzing technical data, isolating root causes, validating assumptions, and communicating recommendations to technical and business partners
• Experience developing scripts, automation, dashboards, or reporting solutions using technologies such as SAS, REXX, Python, Java, Bash, or similar languages
• Strong written and verbal communication skills with the ability to document findings, operational procedures, and technical recommendations
• Experience supporting production incidents, change validation, performance testing, and operational readiness activities
• Bachelor's degree in Computer Science, Engineering, Information Technology, Mathematics, or a related discipline preferred; equivalent experience will be considered

Skills

Performance engineering

Capacity management

Systems programming

Production engineering

Automation scripting

Education

Bachelor's degree in Computer Science/Engineering/IT/Math

Tools

CICS

IBM MQ

WebSphere WAS

Liberty

Compute Grid

Kafka

ODM

IntelliMagic

SYSVIEW

SAS/MXG

Grafana

Datadog

Prometheus

PostgreSQL

VictoriaMetrics

Job description

Fidelity Investments Inc. is seeking a Principal Engineer in the Mainframe Capacity and Performance Engineering organization to analyze, monitor, and improve the performance of critical middleware platforms that support Fidelity's core business applications.

You will identify bottlenecks, perform capacity analysis, and support incident investigations across IBM mainframe technologies. Collaborating with application, infrastructure, and engineering teams, you will deliver automation, dashboards,