Mainframe Security Engineer

Division: Group Technology Services (GTS)
Core Systems Tribe Integration Mainframe

Core Systems Tribe Mainframe Security

At Euroclears Core Systems Tribe we focus on strengthening and evolving the companys core IT environments. Our mission is to ensure the stability scalability and controlled evolution of Euroclears core technologies supporting critical business operations.

This role offers an excellent opportunity to start or further develop a career as a Mainframe Security Engineer. You will work closely with experienced colleagues contribute to the engineering and operation of security solutions across operating systems middleware third-party software and network components and progressively build expertise in monitoring auditing cryptography and security tooling within mission-critical mainframe environments.

Responsibilities

Under the guidance of experienced team members you will:

• Design configure administer and enforce security controls across z/OS middleware and thirdparty products (e.g. RACF profiles permissions policies).
• Manage identities and access (role/entitlement design reviews segregation of duties).
• Monitor audit and respond to security events including alerting log analysis and basic incident investigation.
• Implement and maintain cryptographic controls key management and data protection mechanisms.
• Develop and maintain security tooling and automation (e.g. REXX JCL scripts) to support compliance reporting and operational efficiency.
• First starting with daylight support and once you will have gain enough expertise you will participate in Night Production Watch Duty on a rotational basis with support from the team. This will also include (rare) weekend activities during special deployments.

Complexity & Problem Solving

• Handle standard and well-defined situations by applying documented procedures and established methods.
• Escalate non-standard or complex issues to senior colleagues and domain experts while contributing to analysis and resolution.
• Develop understanding across several known technical domains with structured support.

Decision Making

• Make day-to-day decisions within clearly defined processes guidelines and supervision.
• Apply existing policies and standards escalating when deviations or risks are identified.

Autonomy & Collaboration

• Work effectively on assigned activities with regular guidance and supervision.
• Organise and plan individual tasks within agreed priorities.
• Demonstrate willingness to learn ask questions and progressively increase autonomy.
• Contribute positively to team collaboration in a multicultural environment.

Qualifications

• Bachelors or Masters degree in Computer Science IT Engineering or equivalent practical experience.
• Initial experience or strong interest in mainframe environments (z/OS) either through studies internships or early professional roles.
• Basic knowledge or exposure to security principles JCL ReXXis an advantage.
• First experience or foundational knowledge in scripting or programming.
• Any additional exposure to mainframe technologies is considered a plus.

Skills & Competencies

• Strong willingness to learn and develop technical expertise.
• Good team player with the ability to work in a multicultural and collaborative environment.
• Attention to detail combined with the ability to understand the broader operational context.
• Structured and methodical approach to tasks.
• Continuous improvement mindset.
• Proficiency in English (spoken and written).

Please note that this is a permanent position and we do not offer freelance/contract arrangement for the role.

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