Application Development AS400 Developer

Cynet Systems•Oklahoma City, OK

About The Position

We are seeking an experienced Application Development AS400 Developer with a minimum of 5+ years of hands-on experience in AS400 (IBM i, iSeries) application development and support. The role involves maintaining, modifying, and optimizing custom legacy application code, investigating and troubleshooting operational bugs, and updating logic to adapt to changing requirements. A key aspect of this role is serving as the primary technical point of contact to coordinate with the hosting provider for system maintenance and environmental adjustments. You will also manage application-level security, job queues, and coordinate with backup operations. Strong skills in DB2 for i database management and secure file transfers are essential. This position requires the ability to pass a comprehensive background check.

Requirements

Minimum of 5+ years of hands-on experience in AS400 (IBM i, iSeries) application development and support.
Exceptional proficiency in RPG IV (ILE RPG), RPGLE, CL, and SQL on DB2 for i.
Prior experience working in a hosted/managed AS400 environment, collaborating with external hosting providers to resolve infrastructure or environmental issues.
Proven experience in IBM i work management, subsystem coordination, application security, and user profile management.
Strong background in file transfer automation (FTP, SFTP).
Ability to pass a comprehensive background check as required by state IT security standards.

Nice To Haves

Direct experience assisting in legacy-to-cloud migrations or data warehousing extractions.
Familiarity with modern IBM i tools, such as Rational Developer for i (RDi).
Prior experience working in public sector environments or supporting insurance regulatory systems.

Responsibilities

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.
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 storage and backup operations teams to ensure application backup windows, disaster recovery testing, and restoration verifications are carried out successfully.
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 systems.
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.