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:

• With close guidance and according to established procedures you will:
• Support the implementation and maintenance of security controls across z/OS middleware and third party products (e.g. RACF profiles permissions policies).
• Execute identity and access management tasks including role assignment basic entitlement updates and participation in access reviews.
• Perform routine monitoring and audit activities (log checks alert handling initial triage).
• Assist in security event analysis escalating incidents as required.
• Contribute to cryptographic operations (key management handling controls execution) under supervision.
• Support the development and maintenance of basic automation and tooling (REXX JCL scripts).
• Produce standard reports and documentation to support compliance and operational activities.
• Start with daylight support and progressively participate in on-call/watch duty once sufficiently trained.
  

Complexity & Problem Solving

• Work on well-defined routine tasks using documented procedures.
• Identify issues and escalate appropriately to more experienced engineers.
• Contribute to investigations by collecting data and applying known methods.
• Develop understanding of core domains (z/OS RACF IAM crypto) with structured support.

Decision Making

• Take day-to-day decisions within clearly defined guidelines.
• Apply established standards and policies consistently.
• Escalate deviations risks or uncertainties to senior team members.

Autonomy & Collaboration

• Operate with regular supervision and coaching.
• Plan and organise own tasks within clearly prioritised work.
• Actively seek feedback and demonstrate continuous learning behaviour.
• Collaborate effectively within a multicultural cross-functional team.
• Gradually increase autonomy as experience develops.

Qualifications

• Bachelors or Masters degree in Computer Science IT Engineering or equivalent experience.
• Initial exposure to mainframe environments (z/OS) through studies internships or first roles.
• Basic knowledge of security concepts is an advantage.
• Exposure to JCL REXX or scripting/programming is a plus.
• Interest in mainframe security and enterprise environments..

Skills & Competencies

• - Strong learning mindset and curiosity.
• - Ability to follow structured processes and standards.
• - Attention to detail with awareness of operational context.
• - Good collaboration and communication skills.
• - Analytical thinking at a foundational level.
• - 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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