AS400 Developer / Application Administrator

We are seeking an experienced, high-caliber AS400 Developer / Application Administrator to support critical public-sector initiatives. In this role, you will serve as the core technical resource responsible for legacy application maintenance, database tuning, and environment administration across OID’s enterprise IBM AS/400 (IBM i Series) platform. You will collaborate closely with managed hosting partners, cloud architects, and agency stakeholders to ensure uninterrupted daily operations while helping lay the groundwork for long-term cloud modernization and data transition. This position offers a flexible 20-hour work week in an Oklahoma City hybrid-remote model. Key Responsibilities

1. Legacy Application Maintenance & Support Maintain, modify, and optimize mission-critical custom applications written in RPG, RPG III, RPG IV (ILE RPG), RPGLE, and Control Language (CL). Troubleshoot complex operational bugs, resolve batch run anomalies, and address user-reported production issues promptly. Implement business logic modifications and rule updates to align with state regulatory mandates, licensing workflows, and statutory updates.

2. Application Administration & Hosting Liaison Serve as the primary technical point of contact interfacing with third-party managed hosting providers (e.g., Ensono) regarding OS patching, maintenance windows, database utility execution, and infrastructure updates. Administer application-level security configurations, user profiles, and object-level authorities. Monitor and analyze security audit journals (QAUDJRN) to maintain system integrity and compliance. Manage local job queues, active subsystems, and application job schedules. Coordinate backup schedules, disaster recovery exercises, and system restore verifications.

3. DB2 Database & System Integration Query, administer, and tune DB2 for i databases; optimize SQL queries and indexes to sustain high database performance. Maintain and monitor secure automated data pipelines and file transfers (SFTP / FTP) between the hosted AS400 partition and downstream state, regional, and partner enterprise systems.

4. Modernization & Migration Enablement Partner with state database administrators and enterprise cloud architects to extract, scrub, and archive legacy tables. Document legacy application flows, data schemas, interdependencies, and operational logic to facilitate smooth transitions toward modern cloud platforms.

Experience: Minimum of five (5) years of hands-on experience in AS400 / IBM i / iSeries application development, enhancement, and production support. Core Languages: Advanced proficiency in RPG IV (ILE RPG), RPGLE, CL, and SQL for DB2 on i. Database Management: Demonstrated ability to query, optimize, and manage DB2 for i relational databases. Hosted Environment Coordination: Proven background operating within a third-party managed or hosted AS400 environment, working directly with vendor infrastructure teams. IBM i Administration: Practical experience in work management, active subsystems, user profile permissions, and application-level security management. Integrations: Solid track record configuring and troubleshooting secure batch file exchanges (FTP / SFTP)., Prior experience supporting state government, public sector, or insurance regulatory environments. Familiarity with legacy modernization strategies, cloud data staging, or ETL extraction projects. Strong independent problem-solving skills and the ability to communicate technical concepts clearly across cross-functional teams., Job Overview: Requirement/Must Have: Minimum of 5+ years of hands-on experience in AS400 (IBM i, iSeries) application development and support. Exceptional proficiency in RPG IV…

• 23 hours ago