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.
• Design, implement and maintain security policies, SSL/SSH certificates and compliance audits.
• Manage backup, recovery and business continuity processes, including BRMS and disaster‑recovery testing.
• Plan and execute high‑availability solutions, DR strategies, and ensure RPO/RTO objectives are met.
• Administer storage systems, perform disk balancing, IFS management and capacity planning.
• Configure and troubleshoot TCP/IP networking, HMCs, tape libraries and related devices.
• Oversee Advanced Job Scheduler, job‑stream design and workload optimisation.
• Lead OS upgrades, PTF management and support application deployments across i partitions.

Required profile

• 11+ years of experience in IBM i / AS/400 system administration.
• Proven ability to handle complex technical escalations and lead infrastructure projects.
• Strong analytical skills for performance tuning, capacity planning and reporting.
• Excellent communication to work with vendors and mentor junior staff.

Required skills

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