Mainframe Security Engineer

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

Core Systems Tribe – Mainframe Security

At Euroclear’s Core Systems Tribe, we focus on strengthening and evolving the company’s core IT environments. Our mission is to ensure the stability, scalability, and controlled evolution of Euroclear’s 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.

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.

• 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.

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

• Bachelor’s or Master’s 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.
• 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.

Embark on your new adventure at Euroclear, and work at the heart of the global capital markets. We connect over 2,000 financial institutions across the globe. As an open and resilient infrastructure, we contribute to the stability of the financial markets. We help clients cut through complexity, lower costs, and mitigate risks of financial transactions. At Euroclear, we have the clear ambition to use our key role to facilitate and accelerate a sustainable global financial system.

• Work closely with inspiring, supportive and engaged colleagues from more than 80 different countries.
• Practice your talents in a highly professional international environment.
• Join a learning and development environment with an emphasis on…