Senior RPG Developer for IBM iSeries / AS400

Job Description

As a Senior RPG Developer for IBM iSeries / AS400, you will develop and maintain applications running on IBM iSeries. You will support operational and project-based activities, including bug fixing, small enhancements, application analysis, technical documentation, integration work, and modernization initiatives.

This senior role requires an understanding of legacy enterprise systems, the ability to work independently, and confidence communicating with technical and business stakeholders.

Responsibilities

• Analyse IBM iSeries applications, databases, interfaces, and dependencies.
• Develop and maintain solutions using RPG IV, RPGLE, ILE RPG, Free-Format RPG, and CLLE.
• Design and optimise Db2 for i database structures and SQL queries.
• Diagnose complex application, database, integration, and system issues.
• Analyse job logs, batch processes, queues, and performance bottlenecks.
• Plan, test, implement, and document production changes.
• Build and maintain integrations using REST, SOAP, JSON, XML, ODBC, JDBC, and file transfers.
• Support integrations with ERP, CRM, finance, manufacturing, logistics, and sales systems.
• Participate in automation, migration, and application modernisation projects.
• Cooperate with customers, external vendors, and internal technical teams.
• Provide advanced third-line support for critical incidents.

Required Technical and Professional Expertise

• Strong commercial experience with IBM iSeries / AS400 environments.
• Strong hands-on experience with RPG / RPGLE / ILE RPG.
• Practical knowledge of CL / CLLE.
• Good knowledge of Db2 for i and SQL.
• Experience with 5250-based applications and IBM i system commands.
• Ability to analyse application logic, job logs, system messages, and data issues.
• Experience with file-based integrations, including IFS, SFTP/FTP, CSV, and XML.
• Understanding of enterprise application support and production troubleshooting.
• Ability to read, understand, and safely modify legacy code.
• English at a minimum B2 level.

Nice to Have

• Experience with free-format RPG or SQLRPG.
• Experience with REST APIs, JSON, XML, or middleware integrations.
• Knowledge of RDi, VS Code / Code for IBM i, or similar modern development tools.
• Experience with ODBC/JDBC integrations.
• Knowledge of DDS, Query/400, or legacy green-screen applications.
• Experience in manufacturing, logistics, ERP, warehouse, or SAP-integrated environments.
• German language skills.

Non-Technical Requirements

• Strong analytical and problem-solving skills.
• Ability to work independently in a remote support model.
• Ownership mindset and responsibility for delivered changes.
• Good communication skills with technical teams and business users.
• Ability to explain technical issues clearly and in a structured way.
• Attention to detail when working with business-critical systems.
• Readiness to work with legacy systems while supporting their gradual modernization.
• Customer-oriented approach and ability to work in an international environment.

Benefits

• B2B or employment contract.
• Working with latest technologies.
• Industry-leading healthcare and comprehensive medical coverage, including Luxmed and Multisport.
• Opportunities to enhance qualifications through MS certifications, Udemy courses, and other learning resources.
• Customizable one-to-one English or German lessons.
• Modern computer equipment.
• Networking and team-building opportunities.
• Employee referral programme.
• Flexible working schedule.
• 100% remote work with occasional travel to customers around Europe.