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# Senior Mainframe Systems Engineer

- **Company:** CGI Group
- **Location:** Baltimore, MD, United States
- **Experience:** Expert
- **Salary:** $71,700.0 - $176,300.0
- **Contract:** Permanent contract
- **Skills:** Application Lifecycle Management, Systems Engineering, CLIST, Software Debugging, Middleware, Job Control Language (JCL), IBM Mainframe, Rexx (Programming Language), IBM Websphere Application Server, Job Entry Subsystem 2/3, Mainframes, Performance Tuning, IBM Resource Access Control Facility, Z/OS, Tso/ispf, System Availability, Reliability of Systems, Information Technology, Performance Monitor, Api Design, Api Gateway
- **Published:** May 19, 2026
- **Apply:** https://www.indeed.com/viewjob?jk=e7e3c9a5c71354f5

## About the Role

Ability to obtain and maintain Public Trust clearance
.Bachelor's degree +14 years of relevant IT experience
.Advanced experience administering IBM z/OS at the system engineering level.
.Expertise with WebSphere on z/OS, including installation, configuration, and tuning.
.Strong SMP/E knowledge and mainframe software lifecycle management skills.
.Deep experience with JCL, TSO/ISPF, RACF, JES2/JES3, and common IBM utilities.
.Ability to perform advanced debugging, dump analysis, and system performance monitoring.

Desired qualifications/non-essential skills required:
.Experience with mainframe modernization or hybrid integration efforts.
.Familiarity with REXX, CLIST, or automation frameworks for mainframe operations.
.Experience supporting large federal mainframe environments.
.Knowledge of mainframe-to-cloud or API-driven modernization strategies., * Analytical Thinking

 * JCL
 * Mainframe
 * Technical Analysis
 * Websphere Application Server

## Description

CGI is seeking a Senior Mainframe Systems Engineer to architect, maintain, and optimize mission-critical z/OS environments supporting federal agency enterprise platforms. This senior role oversees mainframe software installation, SMP/E maintenance, middleware operations, and cross-platform integration while ensuring high availability, performance, and system resilience., Lead installation, configuration, and lifecycle management of z/OS and related IBM mainframe subsystems.
.Architect and maintain WebSphere for z/OS, mainframe middleware, and associated system components.
.Oversee SMP/E software installation, patching, product upgrades, and maintenance strategy.
.Perform advanced z/OS performance tuning, capacity planning, and workload management (WLM).
.Manage JES2/JES3 operations, RACF security configurations, system exits, and automation routines.
.Troubleshoot complex mainframe incidents, diagnose root causes, and implement long-term corrective actions.
.Support integration with distributed applications, API gateways, and modernization toolchains.
.Produce detailed architectural documentation, system design packages, and operational standards.
.Provide technical leadership to junior engineers and collaborate with cross-functional infrastructure teams.


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