iSeries (AS/400) Infrastructure Administrator – L3

About the role

We are looking for a senior iSeries (AS/400) Infrastructure Administrator (Level 3) to lead the administration, optimisation and modernisation of our enterprise i environments. The role is the highest technical escalation point, responsible for performance, security, availability and continuous improvement of critical business platforms.

Key responsibilities

• Provide technical leadership and mentor L1 operators and L2 administrators.
• Develop and enforce operational procedures, standards and best practices for i administration.
• Analyse system performance, conduct capacity planning and produce executive‑level availability reports.
• Design, implement and maintain i security policies, SSL/Digital certificates, SSH and secure key management.
• Manage backup, recovery and business continuity processes, including BRMS troubleshooting.
• Design, test and operate High Availability and Disaster Recovery solutions meeting RPO/RTO targets.
• Administer internal and external storage, perform disk balancing, performance tuning and IFS management.
• Configure and troubleshoot TCP/IP networking, HMCs, tape libraries and related devices.
• Manage Advanced Job Scheduler, job‑stream design and production workload scheduling.
• Plan and execute OS upgrades, PTF management and support application deployments across i partitions.

Required profile

• Minimum 11 years of hands‑on experience with iSeries/AS‑400 environments.
• Proven ability to lead technical teams and act as a senior escalation point.
• Strong analytical skills with a focus on performance optimisation and capacity planning.
• Excellent communication skills to interact with vendors and produce executive reports.

Required skills

• iSeries (AS/400) / IBM i system administration
• Performance tuning and capacity planning
• Security administration (SSL, SSH, digital certificates)
• Backup & recovery (BRMS)
• High Availability & Disaster Recovery design
• Storage administration and Integrated File System (IFS)
• TCP/IP networking on i platforms
• Hardware Management Console (HMC) administration
• Advanced Job Scheduler
• Tape library management and firmware upgrades
• PTF management and OS upgrade planning