• Develop and implement new features and functionalities using COBOL

• Maintain and enhance the existing securities processing system

• Refactor and optimize existing modules with a focus on performance and maintainability

• Improve application logging, monitoring, and troubleshooting capabilities

• Contribute to the enhancement of disaster recovery solutions

• Integrate the mainframe environment with a modern, decentralized system architecture

• Work on critical business processes including:

  • Order management

  • Securities trading and settlement

  • Fee and tax calculation

  • Transaction processing

• Analyze existing applications and identify opportunities for technical and performance improvements

• Collaborate closely with other development and technical teams

• Take ownership of technical topics and drive them through to successful implementation

• Contribute to a high-quality, stable, and future-oriented mainframe environment

• 10+ years of professional experience in mainframe computing
• Strong hands-on experience with COBOL
• Solid experience with IBM z/OS
• Strong knowledge of:
  • DB2
  • CICS
  • JES/JCL
• Proven experience in the banking, securities trading, or financial services industry
• Strong analytical and structured approach to problem-solving
• Ability to work independently and take ownership of assigned topics
• Excellent communication and collaboration skills
• Ability to work effectively across different teams and disciplines
• Strong prioritization and organizational skills
• Willingness to both give and receive constructive feedback
• Team-oriented mindset combined with a high degree of independence
• Fluent English is required
• German is an advantage
• Willingness to work 2–3 days per week on-site in Vienna

Nice to Have

Experience with the following technologies and tools would be an advantage:

• Java on z/OS
• Strobe
• Dynatrace
• Xpediter
• ChangeMan

We are looking for an experienced Senior Mainframe Developer (m/f/d) to join a challenging project within the banking and securities trading environment.

In this role, you will be responsible for the development, maintenance, and continuous improvement of a business-critical securities processing system running on IBM mainframe technology. You will work on new functionality, modernize and optimize existing applications, and contribute to the integration of the mainframe environment into a modern, decentralized architecture.

The ideal candidate brings extensive mainframe expertise, a strong background in financial institutions, and a proactive, hands-on approach to software development.