Application Development AS400 Developer

AS400 Developer
Oklahama City,OK
HYBRID

Key Responsibilities

1. Legacy Application Maintenance & Support

• Maintain, modify, and optimize custom legacy application code written in RPG, RPG III, RPG IV (ILE RPG), RPGLE, and Control Language (CL).

• Investigate and troubleshoot operational bugs, batch run anomalies, and user-reported system issues.

• Update existing logic to adapt to regulatory changes, licensing requirements, and business process updates.

2. Application Administration & Infrastructure Liaison

• Serve as the primary technical point of contact to coordinate with the hosting provider for system maintenance, OS patching schedules, database utilities, and environmental adjustments.

• Manage application-level security configurations, including user profiles, object-level authority, and verify system audit logs (QAUDJRN) to maintain system integrity.

• Manage local job queues, active subsystems, and application-level job schedulers.

• Coordinate with third-party storage and backup operations teams to ensure application backup windows, disaster recovery testing, and restoration verifications are carried out successfully.

3. DB2 Database & Integration Management

• Query, manage, and tune DB2 for i databases, optimizing SQL queries and indexes to ensure database responsiveness.

• Support secure, automated file transfers (SFTP/FTP) and interfaces between the hosted AS400 partition and downstream or partner systems.

4. Modernization & Migration Enablement

• Cooperate with database administrators and cloud architects to extract, clean, and archive legacy tables.

• Document system flows, database schemas, and interdependencies to facilitate a seamless transition of legacy business logic to modern cloud systems.

Requirements

• Experience: Minimum of five (5) years of hands-on experience in AS400 (IBM i, iSeries) application development and support.

• Programming Skills: Exceptional proficiency in RPG IV (ILE RPG), RPGLE, CL, and SQL on DB2 for i.

• Hosting Coordination: Prior experience working in a hosted/managed AS400 environment, collaborating with external hosting providers to resolve infrastructure or environmental issues.

• Application Administration: Proven experience in IBM i work management, subsystem coordination, application security, and user profile management.

• Data Integration: Strong background in file transfer automation (FTP, SFTP).