Senior AS400 Engineer – Amsterdam, Netherlands-

Location: Amsterdam Start: Immediate Contract Duration: 6 months Experience: 46 years Role Type: DevOps / Engineering Stack: AS400 / IBM i

We are seeking a Senior AS400 Engineer to join a DevOps team responsible for maintaining enhancing and stabilizing AS400/IBM i applications. You will work across legacy ERP systems complex integrations and lowdocumentation environments ensuring business continuity and high system reliability. This role also includes mentoring engineers and occasionally stepping into Team Lead responsibilities.

• Maintain and enhance AS400 applications (fixes improvements new logic).
• Develop and support RPG III RPG IV RPG ILE and RPG Free Format programs.
• Work with CLP programming DB2/400 embedded SQL and AS400 file systems.
• Manage job processing batch jobs scheduling and system performance.
• Analyze data flows APIs and integration dependencies across ERP and enterprise systems.
• Support interfaces between AS400 and SAP POS logistics and other systems.
• Perform incident triage troubleshooting and root cause analysis.
• Work within ITSM processes to meet SLA MTTR and incident reduction targets.
• Contribute to DevSecOps KPIs (DORA metrics deployment success rate).
• Mentor junior engineers and provide leadership when required.
• Ensure stability-first operations with zero disruption during transitions.

• RPG III / RPG IV / RPG ILE / RPG Free Format
• AS400 Lansa
• CLP programming
• DB2/400 (DB400) embedded SQL
• AS400 job processing batch jobs scheduling
• File systems data structures database design

• Legacy ERP systems and custom-built applications
• Interfaces with SAP POS logistics systems
• Data flow analysis API understanding integration dependencies

• Incident triage and resolution
• Root Cause Analysis (RCA)
• ITSM tools and ticketing workflows

• Automation tools for repetitive support tasks
• Knowledge graph/documentation tools
• AI-assisted troubleshooting or reverse engineering

• SAP S/4HANA migration exposure
• Legacy system decommissioning strategies
• Coexistence scenarios (AS400 SAP transition)

• Monitoring logging observability
• CI/CD and release management concepts

• Strong problem-solving in ambiguous low-documentation environments
• Ability to work with complex legacy systems and unclear dependencies
• Effective collaboration with SMEs SAP teams and multi-vendor ecosystems
• High learning agility and comfort with reverse engineering
• Ownership mindset with a stability-first approach
• Commitment to zero disruption during operations

You will be working at the core of mission-critical enterprise systems ensuring stability reliability and smooth operations across interconnected business processes. Ideal for engineers who thrive in legacy environments and enjoy deep technical problem-solving.