Mainframe Developer - Securities Processing Platform

We are looking for an experienced Senior Mainframe Developer (m/f/d) to support a leading financial institution in Vienna in the development, maintenance, modernization, and continuous improvement of its business-critical securities-processing platform. Vienna Parttime 1x / week on site 01.12.2026

Must haves

• Cobol/ DB2
• CICS und z/OS
• JCL / JES

Nice to have

• Java auf z/OS.
• Dynatrace und Strobe
• Xpediter

Wanted Expertise

• Developer - Developer (other)
• Finance - Developer
• Developer - Databases- SQL-Server, DB2, …

Your Tasks

• Design, develop, test, and implement COBOL-based applications, features, and enhancements.
• Maintain, support, and further develop the existing mainframe securities-processing platform.
• Support and optimize critical business processes, including:
• Order management and transaction processing
• Trade execution and securities trading
• Fee and tax calculation
• Clearing and settlement
• Refactor and optimize existing application modules to improve performance, maintainability, and reliability.
• Analyze, troubleshoot, and resolve complex technical and functional issues.
• Improve application logging, monitoring, and operational resilience.
• Enhance system availability, stability, and disaster recovery capabilities.
• Integrate the mainframe environment with modern distributed and decentralized architectures.
• Analyze complex system landscapes, interfaces, dependencies, and technical interactions.
• Prepare and maintain technical documentation.
• Take end-to-end ownership of assigned topics throughout the entire software development lifecycle.
• Ensure compliance with internal technical standards, security requirements, and development guidelines.

• At least 10 years of professional experience in mainframe development and mainframe computing.
• Extensive hands-on experience with:
• COBOL
• DB2
• CICS
• JCL / JES
• z/OS
• Proven experience working with mainframe systems in the banking or financial services industry.
• Strong understanding of securities trading and securities-processing business processes, particularly:
• Order and transaction management
• Trade execution
• Clearing and settlement
• Fee and tax calculation
• Real-time trading systems
• Proven experience in application performance analysis, optimization, troubleshooting, and production support.
• Experience working with complex system landscapes and analyzing technical dependencies.
• Knowledge of integrating mainframe applications with modern distributed and decentralized architectures.
• Ability to identify operational risks, assess priorities, and develop effective solutions.

Nice to Have

• Experience with Java on z/OS.
• Knowledge of performance analysis and monitoring tools such as Strobe and Dynatrace.
• Experience with Xpediter and ChangeMan.
• Familiarity with mainframe integration technologies.
• Experience working with modern distributed and decentralized system architectures.
• Knowledge of approaches to improving the stability, availability, and performance of business-critical applications.

Your Personal Skills

You are a proactive and reliable professional who combines strong technical expertise with a structured and solution-oriented mindset.

You also bring:

• Strong analytical and problem-solving skills.
• A high degree of ownership, accountability, and independence.
• A proactive approach and the ability to take responsibility for complex topics.
• Excellent teamwork and collaboration skills.
• Strong communication skills and the ability to work effectively with technical and business stakeholders.
• A structured approach to prioritization and risk management.
• A willingness to share knowledge and support the continuous development of the team.

Languages

• English: Fluent, both written and spoken (mandatory).
• German: Good knowledge is an advantage., * 20 years of IT-recruitment experience
• access to a huge talentpool
• individual consulting.