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# Application Development AS400 Developer

- **Company:** Lancesoft, Inc.
- **Location:** Oklahoma City, OK, United States
- **Experience:** Expert
- **Contract:** Temporary to permanent
- **Skills:** Db2400, Os/400 Operating System, Applications Architecture, Application Integration Architecture, Business Logic, IBM System I, Batch Processing, Databases, Scientific Data Archiving, Data Mining, Database Storage Structures, Disaster Recovery, IBM RPG (Programming Language), Server Administration, Software Engineering, SQL Databases, Subsystems, Systems Integration, File Transfer Protocol (FTP), Control Language, Legacy Systems
- **Published:** October 27, 2026
- **Apply:** https://www.careerbuilder.com/job-details/application-development-as400-developer-oklahoma-city-ok--085b6317-bb20-49a8-a2ed-de1d65beba27

## About the Role

Software Development, IBM AS-400 Server, IBM AS-400 Server, Software Administration, IBM Product Family, Insurance, Software Development, Production Support, RPG Programming Language, System Integration (SI), * 5+ years of hands-on experience developing and supporting applications on AS400 / IBM i / iSeries environments.

 * Strong hands-on experience with RPG IV, ILE RPG, RPGLE, and CL/CLLE.
 * Strong experience with DB2 for i and SQL.
 * Experience troubleshooting production applications, batch jobs, and legacy application issues.
 * Experience with IBM i application administration, including jobs, job queues, subsystems, user profiles, and object-level security.
 * Experience with FTP/SFTP and application integrations.
 * Experience working with hosted or managed IBM i environments and coordinating with external infrastructure/support teams.

Preferred Qualifications

 * Experience supporting legacy-to-cloud migration, data extraction, or data archiving initiatives.
 * Experience with Rational Developer for i (RDi).
 * Experience working with state government, public-sector, insurance, or regulatory applications.
 * Experience documenting legacy application architecture, business rules, and database dependencies.
 * Familiarity with IBM i backup, disaster recovery, and restoration processes.

## Description

The client is seeking an experienced AS400 / IBM i Developer & Application Administrator to support legacy applications and databases within the Oklahoma Insurance Department (OID) environment.

The successful candidate will be responsible for RPG/RPGLE application development and maintenance, production support, DB2 for i database activities, application-level IBM i administration, and system integrations.

The underlying IBM i infrastructure and operating system are hosted and managed by an external provider. Therefore, this position focuses primarily on application development, application support, database management, and coordination with the hosting provider rather than hardware or OS-level infrastructure administration., * Maintain, modify, enhance, and troubleshoot legacy applications developed using RPG, RPG III, RPG IV/ILE RPG, RPGLE, and CL/CLLE.

 * Investigate and resolve application defects, production issues, batch processing problems, and user-reported issues.
 * Modify existing application logic to support regulatory, licensing, and business process changes.
 * Analyze existing legacy code and business logic to identify root causes and implement appropriate solutions., * Review IBM i audit information, including QAUDJRN, as needed for troubleshooting and security verification.
 * Monitor and manage application jobs, job queues, subsystems, and scheduling activities.
 * Coordinate with the external hosting provider regarding system maintenance, environmental changes, and infrastructure-related issues.
 * Assist with backup, disaster recovery, and restoration verification activities., * Assist with extracting, cleaning, and archiving data from legacy IBM i databases.
 * Document application workflows, database structures, dependencies, and legacy business logic.
 * Support database and cloud teams during legacy application modernization and migration initiatives.
 * Help identify application and data dependencies that may impact migration activities.