Hybrid- IBM i/AS400 iSeries Performance Engineer

About the role

We are seeking an experienced IBM i / AS400 (iSeries) Performance Engineer to provide advanced performance analysis, optimization, and operational support for critical IBM i environments.

Responsibilities

• Analyze and troubleshoot IBM i performance bottlenecks across CPU, memory, disk, database, jobs, subsystems, and workloads.
• Perform capacity planning and provide recommendations for system optimization and resource utilization.
• Utilize IBM i performance analysis tools such as GIAPA, Job Watcher, Robot Monitor, Performance Data Investigator (PDI), Collection Services, Navigator for i, iDoctor, and related monitoring tools.
• Lead performance remediation efforts and collaborate with application teams to resolve performance-related issues.
• Conduct performance trend analysis and develop proactive recommendations to improve system stability and scalability.
• Provide day-to-day support and administration of IBM i (AS400) systems.
• Execute system maintenance, including PTFs, upgrades, and patch management.
• Manage backup and recovery processes, ensuring data integrity and availability.
• Troubleshoot and resolve system, job, application, and performance issues.
• Administer user profiles, security settings, and access controls.
• Support batch processing, job scheduling, and job queue management.
• Collaborate with application teams to support deployments and changes.
• Maintain documentation, runbooks, operational procedures, and performance analysis reports.
• Ensure compliance with security policies and audit requirements.

Requirements

• 5+ years of experience supporting IBM i / AS400 environments.
• Strong knowledge of IBM i OS (OS/400), CL commands, job control, and system administration.
• 5+ years of hands-on IBM i performance engineering experience, including performance analysis, bottleneck identification, capacity planning, and remediation.
• Demonstrated experience using IBM i performance analysis and monitoring tools such as GIAPA, Job Watcher, Robot Monitor, Collection Services, Performance Data Investigator (PDI), Navigator for i, iDoctor, or similar tools.
• Ability to independently analyze performance data, identify root causes of system slowdowns, and implement optimization recommendations.
• Experience with system monitoring, troubleshooting, and production support.
• Familiarity with backup and recovery solutions such as BRMS.
• Understanding of IBM i security administration and user management.

Qualifications

• Experience with IBM Power Systems hardware (preferred).
• Knowledge of DB2 for i, including database administration and query performance tuning (preferred).
• Experience with high availability and disaster recovery solutions such as MIMIX or PowerHA (preferred).
• Exposure to integration with modern platforms including Windows, Linux, APIs, and web services (preferred).
• Experience supporting large-scale, mission-critical production environments (preferred).

Preferred Qualifications

• Proven IBM i performance engineering expertise with the ability to immediately assess and remediate performance issues.
• Strong analytical and troubleshooting skills with experience translating performance metrics into actionable recommendations.
• Comfortable leading performance optimization initiatives in mission-critical environments.
• Hands-on operational mindset with strong problem-solving abilities.
• Able to work independently with minimal ramp-up time while collaborating effectively across cross-functional teams.