AS400 Developer, Admin – OMES supporting OID

3Core Systems, Inc

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

Posted 9/16/2026contractOklahoma City • Oklahoma • United StatesMid-LevelSeniorWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates extensive experience in AS400 application development and support, with a strong focus on RPG IV (ILE RPG), RPGLE, and SQL on DB2 for i. Capable of managing application security, coordinating with external hosting providers, and facilitating legacy-to-cloud migrations.

Highest-signal resume keywords

AS400 Application DevelopmentRPG IV (ILE RPG)SQL on DB2 for iApplication Security ManagementFile Transfer Automation

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

RPG IV (ILE RPG)RPGLEControl Language (CL)SQLDB2 for iLegacy Application OptimizationDisaster Recovery TestingDatabase ManagementUser Profile ManagementLegacy-to-Cloud Migration

Tools & Technologies

Rational Developer for i (RDi)FTPSFTP

Industry Keywords

Public SectorInsurance Regulatory SystemsManaged AS400 EnvironmentInfrastructure CoordinationData Warehousing

Tech Stack

Tools & technologies

CloudSQL

About the role

Key responsibilities & impact

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 application logic for regulatory changes, licensing requirements, and agency business process updates
Coordinate with the hosting provider on system maintenance, OS patching schedules, database utilities, and environmental adjustments
Manage application-level security configurations, including user profiles and object-level authority
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 on application backup windows, disaster recovery testing, and restoration verifications
Query, manage, and tune DB2 for i databases, including SQL queries and indexes
Support secure automated file transfers and interfaces between the hosted AS400 partition and downstream state, regional, or partner systems
Extract, clean, and archive legacy tables with state database administrators and cloud architects
Document system flows, database schemas, and interdependencies for migration of legacy business logic to modern cloud systems
Serve as technical liaison to Ensono for environment-level modifications
Assist state IT leadership with database extraction, legacy business logic documentation, cloud migration, and data archiving initiatives

Requirements

What you’ll need

Minimum of five (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
Experience collaborating with external hosting providers such as Ensono 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) and managing external integrations
Candidates must be local to Oklahoma City or willing to relocate
Must pass a comprehensive background check as required by State of Oklahoma IT security standards
Direct experience assisting in legacy-to-cloud migrations or data warehousing extractions is nice-to-have
Familiarity with Rational Developer for i (RDi) is nice-to-have
Prior experience working in public sector environments or supporting insurance regulatory systems is nice-to-have

Benefits

Comp & perks

12-Month Initial Assignment with high probability of extension
Hybrid schedule options
Contract engagement