AS400 Infrastructure Manager

ESPIRE INFOLABS (SINGAPORE) PTE. LTD.; Singapore; On-site; SGD 80,000 - 110,000; Full time

Job summary

A leading IT infrastructure provider in Singapore is seeking an AS400 IT Infrastructure Manager to oversee the IBM iSeries platform. Responsibilities include strategic planning, system oversight, performance monitoring, and vendor relations. The ideal candidate will have extensive experience with IBM iSeries systems, strong leadership capabilities, and excellent communication skills. This role also involves multitasking on various initiatives and occasional after-hours work.

Qualifications

• Minimum 10 years of experience as an AS/400 Administrator or similar role.
• In-depth knowledge of IBM iSeries hardware and OS/400.
• Experience with security best practices.

Responsibilities

• Develop long-term infrastructure strategies for the iSeries.
• Manage the full lifecycle of AS400 systems.
• Implement industry-standard security protocols.

Skills

IBM iSeries knowledge

Problem-solving

Communication

SQL knowledge

Troubleshooting skills

Leadership skills

Education

Bachelor's degree in Computer Science or related field

Tools

IBM-MQ

CDC Replication

Microsoft Office

iDoctor

Job description

Job Summary

The AS400 IT Infrastructure Manager is responsible for overseeing the end-to-end technical infrastructure and system resources of the IBM iSeries (AS400) platform. This role ensures the reliable, secure, and optimized operation of all iSeries hardware, software, and network components. The manager leads stratelifegic planning, system performance, disaster recovery readiness, and collaborates closely with internal teams and external vendors to align infrastructure services with business needs.

Key Responsibilities

Strategic Planning

Develop and execute long-term infrastructure strategies for the iSeries environment.

System Oversight

Manage the full lifecycle of AS400 systems—including hardware, software, storage, and network connectivity. Install, upgrade, and maintain IBMi-OS and related PTF software on the AS / 400 system. Collaborate with application developers to ensure compatibility and optimal performance. Manage software like IBM-MQ, CDC Replication, Robot products and other software added to the servers.

Performance Monitoring

Ensure optimal system performance, reliability, and availability through regular monitoring and tuning.

Security and Compliance

Implement industry-standard security protocols and maintain compliance with relevant regulations.

Project Management

Lead infrastructure projects such as AS400 hardware refresh, system upgrades, and migrations.

Cross-Team Collaboration

Work closely with application teams, business users, project managers, and vendors.

Capacity Management

Conduct regular capacity planning and system forecasting to support future growth.

Troubleshooting

Identify and resolve system issues promptly, providing Tier 3 support when needed.

Disaster Recovery

Maintain disaster recovery plans and oversee regular testing for AS400 systems.

Backup and Recovery

Manage backup policies and ensure successful data recovery processes.

Vendor Relations

Engage and manage vendors to ensure service quality and contract compliance.

Reporting

Provide regular updates, KPIs, and performance metrics to management.

Team Leadership

Mentor junior infrastructure staff and provide ongoing training and development.

Documentation

Maintain accurate and up-to-date documentation of system configurations, procedures, and troubleshooting guides.

Requirements

• Bachelor's degree in computer science, Information Technology, or a related field (or equivalent experience).
• Minimum 10 years of experience as an AS / 400 Administrator or in a similar role.
• In-depth knowledge of IBM iSeries hardware, OS / 400 operating system, and associated software.
• IT processes, policies and procedures.
• Strong problem-solving and troubleshooting skills.
• Knowledge on iSeries application structure, operating system, installation specifications, troubleshooting, problem determination and data restoration techniques. Knowledge on IBM products like WebSphere-MQ, CDC & iCluster replication, BRMS, ROBOT scheduler and SKLM encryption Knowledge of security best practices and experience in implementing security measures.
• Excellent communication and collaboration skills.
• Good knowledge of SQL, CL, and MS Office Tools (including MS Access)
• Troubleshooting skills for data, application / system performance problems by utilizing tools like IBM idoctor, performance manager and Job watcher.
• Must be able to multitask and management of multiple initiatives when required.
• Willing to work when required.
• Mature and strong leadership skill to lead both technical and service operation management.
• Possess excellent communication skills; able to read, write and speak English.
• Must be willing and available to work after office hours, weekends for deployment activities and be on remote standby duty including occasional weekends when required.