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NTT DATA Logo NTT DATA · IT - Administration

Senior Mainframe SRE

Greece, Athens Employment contract · Job Posted May 16, 2026
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Job Description

As a Senior Mainframe SRE, you will play a key role in ensuring the reliability, evolution, and operational excellence of critical re-platformed middleware services supporting enterprise workloads following the transition from historical z/OS environments. You will lead operational and engineering activities across the middleware stack, driving stability, modernization, recoverability, and service improvement initiatives while coordinating closely with IBM, infrastructure teams, cloud/platform engineers, and application stakeholders.

Job Responsibility

  • Lead critical platform activities across re-platformed middleware services, including incident management, upgrades, patching, feature enablement, and structural platform improvements
  • Own the operational evolution of the re-hosted CICS/TX and MQ platforms running on Linux-based environments
  • Coordinate with IBM, infrastructure teams, application groups, and cloud/platform engineering teams to ensure platform reliability, resilience, and modernization readiness
  • Define and maintain technical standards for platform availability, operational excellence, performance management, housekeeping, monitoring, and root cause analysis
  • Drive reliability and recoverability initiatives, including disaster recovery readiness, backup validation, failover testing, and service continuity improvements
  • Support platform modernization and cloud-readiness initiatives while ensuring production stability and controlled change implementation
  • Act as the escalation point for complex incidents, performance issues, service degradation, and critical operational events
  • Lead operational governance activities, including maintenance planning, change-window coordination, risk assessment, and release readiness validation
  • Promote continuous improvement initiatives focused on automation, observability, operational efficiency, and service resilience

Requirements

  • Bachelor’s or Master’s degree in Computer Science, Engineering, Information Systems, or related field (or equivalent experience)
  • 10-15 years of experience in managing enterprise middleware platforms in large-scale production environments
  • Strong expertise in CICS/TX and IBM MQ administration, upgrades, clustering, performance tuning, and operational support
  • Strong experience supporting Linux-hosted middleware environments with focus on reliability, resilience, and operational governance
  • Proven experience in enterprise platform modernization, migration, or re-platforming initiatives
  • Strong understanding of disaster recovery, service continuity, operational readiness, and recoverability testing practices
  • Experience coordinating with vendors, infrastructure teams, and application stakeholders in complex enterprise environments
  • Strong troubleshooting, root cause analysis, and incident management capabilities
  • Excellent communication, stakeholder management, and technical leadership skills
  • Ability to operate effectively within highly critical and governance-driven environments
  • Fluent in English (written and spoken)

What we offer

  • Health insurance for the employee and one dependent family member (100% paid by NTT DATA)
  • Meal vouchers of 120€ per month (x12)
  • Corporate mobile phone: subscription & device
  • Teleworking equipment allowance
  • Udemy Account
  • Access to Open Up mental health service
  • 28 days of paid annual leave consisting of your legal holidays and compensation days
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