AS400 Subject Matter Expert

Unison Group

Singapore, Singapore, Singapore contract

Posted: April 8, 2026

Required Skills

Job Description

We are hiring an experienced AS400 SME with strong expertise in IBM AS400 / iSeries systems, RPG programming, and Banking & Payment applications.

The ideal candidate will act as a Technical SME / L3 Production Support expert, responsible for supporting mission-critical banking systems, resolving production issues, fixing defects, handling deployments, and ensuring stability of payment-related applications.

This role requires a senior professional who can work across application support, troubleshooting, bug fixing, and platform transition / migration activities in a high-availability banking environment.

Key Responsibilities

• Act as the AS400 Subject Matter Expert (SME) for banking and payment applications
• Provide L3 Production Support for critical business applications running on AS400 / iSeries
• Analyze and resolve production incidents, defects, bugs, and system issues
• Perform root cause analysis and implement permanent fixes for recurring production problems
• Support banking payment systems and ensure smooth transaction processing
• Troubleshoot and resolve issues related to batch jobs, interfaces, system logs, and application failures
• Support application deployments, release activities, and post-deployment validations
• Work on customer migration / platform transition initiatives, ensuring continuity and system stability
• Collaborate with business users, operations teams, development teams, and infrastructure teams
• Provide technical guidance and support during critical incidents and production outages
• Maintain support documentation, knowledge articles, and operational runbooks
• Ensure adherence to incident management, change management, and release management processes

Requirements:
Required Skills & Experience

Technical Skills

• Strong hands-on experience with AS400 / IBM iSeries
• Strong programming experience in:
• RPG / RPGLE
• CL
• DB2

•
• Experience in Application Support / Production Support
• Strong knowledge of:
• Bug Fixing / Defect Resolution
• Incident Management
• Log Analysis
• Deployment & Release Support
• Batch Job Monitoring
• Root Cause Analysis

•
• Good understanding of legacy banking platforms and transaction systems

Domain Experience

• Strong experience in Banking
• Good understanding of Payments systems
• Exposure to:
• Payment transaction processing
• Platform migration / transition
• Customer migration from one system to another
• High-volume transactional environments

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