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.