AS400 Senior Production Support

Unison Group

Singapore, Singapore, Singapore contract

Posted: April 8, 2026

Job Description

This role is ideal for a senior production support professional who can provide technical leadership, incident resolution, defect fixing, deployment support, and platform migration support in a mission-critical banking environment.

The candidate should have strong hands-on experience in production support, bug fixing, system analysis, and customer/payment platform transition projects, with the ability to quickly troubleshoot and stabilize core business applications.

Key Responsibilities

• Act as the SME for AS400 / Mainframe-based banking and payment applications
• Provide production support for critical banking systems with focus on incident management, root cause analysis, and issue resolution
• Investigate, diagnose, and resolve complex bugs, system defects, and performance issues
• Support payment system applications and ensure smooth functioning of transaction processing systems
• Work on customer migration / platform transition initiatives, where systems or customers are moved from one platform to another
• Perform code analysis, enhancements, defect fixing, and support changes in AS400-based applications
• Handle deployment activities, release support, job scheduling, and production log analysis
• Monitor and troubleshoot batch jobs, interfaces, system logs, and transaction failures
• Collaborate with business users, operations teams, developers, infrastructure teams, and vendors to ensure system stability
• Support production incidents, emergency fixes, and post-release validations
• Drive problem management, identify recurring issues, and recommend permanent fixes
• Ensure proper documentation, knowledge transfer, and technical runbooks are maintained
• Participate in change management, release planning, and support governance activities

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