Senior Mainframe Developer (COBOL, PL/I, JCL, DB2, CICS, IMS)

x1F is a company focused on maintaining and modernizing mainframe systems, ensuring legacy COBOL applications are future-proofed and integrated into modern IT landscapes.

• Solid experience in developing applications on mainframe systems, ideally IBM z/OS.
• Strong knowledge of COBOL and/or PL/I, including maintenance and enhancement of existing applications.
• Hands-on experience with mainframe technologies such as JCL, DB2, CICS, CTG, IMS, or comparable components.
• Experience or interest in Java development and modern frameworks.
• Knowledge of legacy modernization, especially COBOL-to-Java transformation.
• Understanding of system architectures and their integration into modern IT landscapes.
• Experience with version control, build, and deployment processes.
• Analytical skills for evaluating applications and system landscapes.
• Familiarity with software development methodologies, agile or traditional.
• Experience in creating technical documentation and test procedures.
• German language proficiency at least C1 level.
• English language proficiency at least B2 level.

Developing:

• Design and enhance applications on the mainframe, for example in COBOL or PL/I.
• Implement new business requirements into existing systems while ensuring seamless integration into established system landscapes.

Maintaining:

• Continuously improve and stabilize existing mainframe applications.
• Analyze issues in live operations, resolve errors, and optimize programs for performance and reliability.

Modernizing:

• Analyze legacy applications as part of modernization initiatives.
• Contribute to transforming and evolving existing systems toward future-ready architectures.

Migrating:

• Migrate COBOL-based applications to modern technologies such as Java.
• Adapt and refactor program logic for new target platforms, ensuring functional equivalence after migration.

Ensuring quality:

• Execute tests and document results.
• Maintain clear documentation of applications, changes, and migration steps.
• Support the creation of technical concepts.

Collaborating:

• Work closely with business departments, architects, and developers.
• Contribute to project teams focused on further development and modernization of the system landscape.

Primarily remote work with occasional travel to Germany, depending on project needs.