AS/400 Application Developer

Job ID: 113029
Location: Oklahoma City, Oklahoma  [Remote]
Category: App/Dev
Employment Type: Contract
Date Added: 07/14/2026
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Role Summary
A senior-level Lead IBM i (AS400/iSeries) Application Developer is sought to support, develop, and optimize mission-critical enterprise applications on the IBM i platform. This role involves technical leadership, system design, and hands-on application development within high-volume, regulated environments, including financial services and healthcare sectors. The position offers an opportunity to lead development initiatives, mentor team members, and collaborate with stakeholders to deliver scalable solutions.

Responsibilities

  • Design, develop, and maintain IBM i (AS400/iSeries) applications using RPG IV, RPGLE Free Format, SQLRPGLE, CLLE, COBOL, and DB2 for i.
  • Lead full lifecycle software development projects, including requirements analysis, design, coding, testing, deployment, and ongoing support.
  • Collaborate with business stakeholders and system analysts to translate requirements into technical solutions.
  • Optimize database structures, including physical and logical files, indexes, stored procedures, triggers, and views, to enhance performance and reliability.
  • Develop and maintain service programs, modules, binding directories, and ILE applications.
  • Troubleshoot production issues, perform root cause analysis, and implement permanent fixes.
  • Create technical specifications, test plans, and documentation for deployment and support.
  • Drive performance tuning and SQL optimization initiatives to ensure high system efficiency.
  • Participate actively in Agile practices such as sprint planning, backlog refinement, and retrospectives.
  • Provide technical mentorship to junior developers and ensure adherence to best practices in development and deployment.

Qualifications

  • Bachelor’s degree in Engineering, Computer Science, Information Technology, or a related field.
  • 10+ years of hands-on experience with IBM i / AS400 application development.
  • Proficiency in RPG III / RPG IV, RPGLE Free Format, SQLRPGLE, CLP / CLLE, COBOL, and ILE architecture.
  • Strong understanding of DB2 for i, including query optimization, stored procedures, triggers, views, and data modeling.
  • Experience with IBM i tools such as RDi, SDA, DFU, WebSphere MQ Series, and change management systems like Aldon or TurnOver.
  • Familiarity with Agile methodologies and collaboration tools including JIRA and Confluence.
  • Excellent troubleshooting, analytical, and problem-solving skills.
  • Effective verbal and written communication skills.
  • Experience working in regulated, high-availability enterprise environments such as banking, healthcare, or large transaction systems.
  • Ability to work remotely and independently manage project deliverables.

Publishing Pay Range: $100.00 – $115.00 hourly

This is a fully remote role and can be performed from an approved location.

About GDH:
At GDH, we believe in the power of people and the importance of caring. Our culture statement, “We care about people,” isn’t just a tagline – it’s the core of everything we do. GDH is a premier staffing and talent solutions company dedicated to helping businesses find the best talent and assisting job seekers in finding their dream jobs.

Who We Are:
GDH, founded in 2001, has grown into a leader in providing staffing solutions across various industries. We specialize in IT across several sectors, connecting top talent with leading enterprises. As a Best of Staffing firm recognized for excellence in client, employee, talent, and women’s services, we pride ourselves on our commitment to quality and service.

GDH Benefits

GDH offers a range of employee benefits that are designed to promote well-being and help maintain a healthy work-life balance. These comprehensive benefits cover various aspects of an employee’s life and aim to enhance their overall experience with the company. Our health benefits include three medical insurance options with access to KISx Card, Zero Card, and HealthJoy concierge services. Other plan offerings include dental, vision, life, disability, supplemental insurance, and pet insurance plans. Enjoy additional perks like holiday pay, 401(k) plan, direct deposit, an employee referral program, work-life balance benefits, a Wellbeats membership, a discounted gym membership program, and more!  For more detailed information on benefits, please go to GDH’s website under the tab for candidates.

GDH provides equal employment opportunities (EEO) to all employees and applicants for employment and prohibits discrimination and harassment of any type without regard to race, color, religion, gender, sex (including pregnancy), sexual orientation, gender identity, national origin, age, disability, genetic information, marital status, ancestry, protected veteran status, military or uniformed service member status, or any other status or characteristic protected by applicable federal, state, and local laws. Applicants with disabilities who require an accommodation or assistance in applying and/or for interviewing, please contact our HR Department.

Please visit our notice of collection for California applicants.

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