Principal, Mainframe Performance and Capacity

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 will not provide immigration sponsorship for this position.

Job Description:

The Role

As a Principal Engineer within Fidelity's Mainframe Capacity and Performance Engineering organization, you will be analyzing, monitoring, and improving the performance of critical middleware platforms that support Fidelity's core business applications. This role focuses on identifying performance bottlenecks, conducting capacity analysis, creating automated reporting and dashboards, and supporting incident investigations across IBM mainframe technologies. You will be partnering with application, infrastructure, and engineering teams to improve system reliability, scalability, and operational readiness. By delivering actionable insights and automation, you will help ensure a high-performing and resilient technology environment supporting millions of customer interactions.

The Expertise and Skills You Bring

• 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

The Team

The Mainframe Capacity and Performance Engineering team plays a critical role in ensuring the stability, scalability, and efficiency of Fidelity's IBM mainframe environment. We provide capacity planning, performance analysis, monitoring, system tuning, and advanced problem determination services for business-critical online and batch applications across the enterprise. Our team partners closely with application development teams, infrastructure engineering, database, storage, network, security, and operations organizations, as well as strategic technology vendors, to maintain the performance and resiliency of Fidelity's most important platforms. Our work helps deliver reliable technology experiences that support Fidelity's commitment to serving customers, associates, and businesses across the firm.

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.

Category:

Information Technology

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.