AS400 Developer / Administrator

Asterism IT Solutions

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

Apply

Vacancy posted 1 day ago

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