Senior RPG Developer for IBM iSeries / AS400 (part-time, 0.25 FTE)

At cloudatus, we help international enterprise customers design, migrate, modernize and support business-critical IT environments. We work across cloud, infrastructure, workplace, security, managed services and enterprise legacy systems.

We are looking for a Senior RPG Developer for IBM iSeries / AS400 to support one of our international customers in the manufacturing and distribution sector.

This is a part-time role requiring approximately 2 hours per working day, equivalent to approximately 0.25 FTE based on an eight-hour working day.

The role focuses on development, maintenance, modernization and troubleshooting of business-critical applications running on IBM iSeries / AS400. You will work with existing RPG-based systems, support integrations, analyze incidents and help improve the stability and maintainability of the application landscape.

Job description:

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

This is a senior role for a person who understands legacy enterprise systems, can work independently and is comfortable communicating with technical and business stakeholders.

At cloudatus, you will:

• 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 analyze application logic, job logs, system messages and data issues.
• Experience with file-based integrations, e.g. IFS, SFTP/FTP, CSV, XML.
• Understanding of enterprise application support and production troubleshooting.
• Ability to read, understand and safely modify legacy code.
• English at 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 both technical teams and business users.
• Ability to explain technical issues in a clear and structured way.
• Attention to detail, especially 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 contract
• Working with latest technologies
• Industry leading healthcare and comprehensive medical coverage (Luxmed, Multisport)
• Opportunities to enhance your qualifications (MS certifications, Udemy courses, etc.)
• Customizable 1-on-1 English or German lessons
• Modern computer equipment
• Opportunities to network and connect (get-togethers, team-building events)
• Employee referral programme
• Flexible working schedule

Location:

• 100% remote,
• occasional travel to customers around Europe.

Take your expertise to new heights with cloudatus. Let’s write another customer success story together.

Sounds like a fit? Let’s talk.