Job Description

AS400 Developer / Administrator – Contract

Location: Oklahoma City, OK – Hybrid

Position Type: Contract

Duration: 12 Months

Hours: 20 Hours/Week

Extension: High probability of extension

Job Overview

We are seeking an experienced AS400 Developer / Administrator to support a critical IBM AS/400 (IBM i / iSeries) environment.

The ideal candidate will have strong hands-on experience in legacy application development and maintenance, IBM i application administration, DB2 for i, production support, troubleshooting, integrations, and modernization/migration support.

The underlying AS400 hardware and operating system infrastructure is externally hosted and managed. This role focuses primarily on application-level development, administration, database support, integrations, and coordination with the external hosting provider.

Key Responsibilities

• Maintain, modify, enhance, and troubleshoot legacy applications developed using RPG, RPG III, RPG IV, ILE RPG/RPGLE, CL, and SQL
• Provide production-level application maintenance and support
• Troubleshoot application defects, batch processing issues, and operational problems
• Modify application logic to support business and regulatory changes
• Manage IBM i application-level administration and work management
• Manage job queues, subsystems, and application job scheduling
• Manage IBM i user profiles, application security, and object-level authorities
• Review system audit information including QAUDJRN
• Coordinate with external hosting/service providers on environmental and infrastructure-related issues
• Support application backup, disaster recovery, and restoration activities
• Query, manage, and optimize DB2 for i databases
• Develop and optimize SQL queries and database indexes
• Troubleshoot database performance and application data-access issues
• Support FTP/SFTP and automated file-transfer processes
• Maintain integrations between IBM i and external/downstream systems
• Extract, cleanse, archive, and prepare legacy data for migration
• Document application flows, database schemas, dependencies, business logic, and system relationships
• Collaborate with DBAs and cloud/modernization teams on legacy-to-cloud migration initiatives

Required Skills & Qualifications

• 5+ years of hands-on AS400 / IBM i / iSeries experience
• 5+ years of IBM i application development and production support
• Strong proficiency in:
• RPG
• RPG III
• RPG IV
• ILE RPG / RPGLE
• CL / CLLE
• SQL
• DB2 for i
• Strong experience maintaining and troubleshooting legacy IBM i applications
• Experience working in a hosted or managed IBM i environment
• Experience coordinating with external hosting/service providers
• Experience with IBM i:
• Work management
• Job queues
• Subsystems
• Job scheduling
• User profile management
• Application security
• Object-level authorities
• QAUDJRN / audit logs
• Strong DB2 for i and SQL experience, including performance and index optimization
• Experience with FTP/SFTP and automated file transfers
• Experience supporting external system integrations
• Strong production troubleshooting and application support experience

Preferred Qualifications

• Legacy-to-cloud migration experience
• Data warehousing/data extraction experience
• Legacy data cleansing and archiving
• Experience with Rational Developer for i (RDi)
• Public-sector/government IT experience
• Insurance or regulatory systems experience
• Experience documenting legacy business logic and application dependencies

Work Environment

• Oklahoma City, OK
• Hybrid work arrangement
• Candidates should be local to Oklahoma City or willing to relocate for required onsite work
• Ability to work effectively with IT leadership, technical teams, and external service providers