Senior AS400 Application Engineer (IBM i)
On-siteAmsterdam, North Holland, The Netherlands
Job Summary
Maintain, enhance, and support enterprise AS400 (IBM i) applications by implementing fixes, enhancements, and production changes using RPG III, RPG IV, RPG ILE, RPG Free Format, CLP, and LANSA. Design, develop, and optimize DB2/400 databases with embedded SQL while managing job processing, batch scheduling, and file systems. Analyze and troubleshoot production incidents, conducting Root Cause Analysis to prevent recurring issues and support ITSM processes including incident, problem, and change management. Evaluate integrations between AS400 and enterprise systems such as SAP, POS, and logistics platforms, collaborating with DevOps teams on deployment and release activities. Mentor junior engineers and provide technical guidance, contributing to legacy application modernization and SAP S/4HANA migration programs.
Required Qualifications
- 4-6 years of experience in AS400 (IBM i) application development and production support
- Strong hands-on experience with RPG III, RPG IV, RPG ILE, RPG Free Format, CLP programming, and LANSA
- Expertise in DB2/400 (DB400) and embedded SQL development
- Good understanding of AS400 job processing, batch scheduling, database design, file systems, and data structures
- Experience supporting legacy ERP applications and custom-built enterprise systems
- Knowledge of enterprise integrations involving SAP, POS, logistics, and other business applications
- Hands-on experience with incident management, Root Cause Analysis (RCA), ITSM processes, and ticketing tools
- Understanding of DevOps practices, monitoring tools, observability, CI/CD concepts, and release management
- Strong analytical, troubleshooting, and problem-solving capabilities
- Excellent communication, collaboration, mentoring, and stakeholder management skills
- Ability to work effectively in complex enterprise environments with limited documentation and evolving business requirements
- Develop, maintain, and enhance enterprise AS400 applications while ensuring high availability and system reliability
- Troubleshoot complex production issues and implement sustainable solutions through effective Root Cause Analysis
- Design and optimize DB2/400 databases and embedded SQL queries for performance and scalability
- Support and maintain integrations between AS400 and enterprise platforms
- Work effectively with business SMEs, SAP teams, vendors, and cross-functional engineering teams
- Mentor junior engineers and provide technical leadership when required
- Support DevOps initiatives, release management, monitoring, and continuous service improvement
- Contribute to application modernization while ensuring uninterrupted business operations
- Adapt quickly to undocumented legacy applications through reverse engineering and knowledge discovery
- Deliver high-quality solutions while maintaining a strong focus on operational excellence and business continuity
Desired Qualifications
- Exposure to automation tools, AI-assisted troubleshooting, and documentation platforms is an advantage
- Familiarity with SAP S/4HANA migration initiatives and legacy system modernization strategies is desirable
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