Sr AS400 Engineer – Amsterdam, Netherlands

Location: Amsterdam Start: Immediate Contract Duration: 6 months Experience: 4–6 years Role Type: DevOps / Engineering Stack: AS400 / IBM i

About the Role

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 low‑documentation environments, ensuring business continuity and high system reliability. This role also includes mentoring engineers and occasionally stepping into Team Lead responsibilities.

Key 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.

Must-Have Skills

AS400 / IBM i Expertise

• 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

Integration & Application Knowledge

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

Incident & Production Support

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

Good-to-Have Skills

Automation & AI Enablement

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

Modernization Awareness

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

DevOps & Observability

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

Soft Skills

• 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

Why This Role Matters

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.