> Markdown version of [/jobs/ext/297515-mainframe-security-engineer](https://www.wearedevelopers.com/jobs/ext/297515-mainframe-security-engineer). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Mainframe Security Engineer - **Company:** Euroclear - **Location:** Belgium - **Contract:** Permanent contract - **Skills:** Computer Programming, Computer Networks, Middleware, Job Control Language (JCL), Rexx (Programming Language), Key Management, Log Analysis, Mainframes, Proprietary Software, IBM Resource Access Control Facility, Z/OS, Scripting, Information Technology - **Published:** June 12, 2026 - **Apply:** https://be.indeed.com/viewjob?jk=42175a0f4511804b ## About the Role Do you have experience in Scripting?, Do you have a Master's degree?, * Bachelor's or Master's 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, ReXX is 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). ## Description 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: * Design, configure, administer, and enforce security controls across z/OS, middleware, and third - party 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. ## Related Videos - [".Net is too slow" was not an option](https://www.wearedevelopers.com/videos/100176-net-is-too-slow-was-not-an-option) - [Developer’s Perspective: Overview of the Tezos Blockchain Ecosystem](https://www.wearedevelopers.com/videos/237-developer-s-perspective-overview-of-the-tezos-blockchain-ecosystem) - [JavaScript? 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