Build reliability where it matters most Not every SRE role gives you the chance to redefine critical infrastructure. This one does. At NTT DATA, you'll work on the evolution of a re-platformed mainframe middleware stack, moving from traditional z/OS environments to Linux-based distributed systems—while keeping the reliability standards of mission-critical services. This is not about maintaining legacy. This is about transforming it. About NTT DATA NTT DATA is a global team of more than 139,000 professionals, present in over 50 countries. We work across industries such as telecommunications, banking, energy, industry and public sector, helping organizations evolve through technology. But what really defines us is how we do it. We build environments where people belong, grow and innovate. Where learning is continuous, impact is real, and collaboration is how things get done. Make this the place where you grow. Your mission You will take ownership of a critical middleware platform (CICS / MQ) running on Linux, ensuring its stability, scalability and evolution in a high-demand production environment. This role combines deep technical expertise + platform ownership + real decision-making capacity. ️ What you'll be doing Lead platform reliability and operations for CICS TX and MQ services Own incidents, problem management and RCA in critical environments Drive upgrades, improvements and evolution of the middleware stack Define and enforce standards for availability, performance and operational excellence Coordinate with IBM, application teams and cloud/DR initiatives Improve observability, automation and change management processes Act as technical reference in a legacy-to-distributed transformation context What we're looking for Solid experience in CICS TX and/or IBM MQ environments Strong background in Linux-based middleware platforms Experience in SRE / production environments (incidents, RCA, SLAs) Understanding of high availability, performance tuning and clustering Ability to operate in critical, high-availability environments Experience working with multiple stakeholders (infra, apps, vendors) What makes this role different You're not maintaining legacy—you're transforming it You'll work in a mission-critical environment with real impact You'll gain exposure to modern SRE practices applied to traditional systems You'll be part of a senior, highly specialized team You'll operate at the intersection of mainframe, distributed systems and cloud readiness What you'll find at NTT DATA Hybrid and flexible working model Support for training and continuous learning Flexible compensation and savings benefits Access to discounts and employee benefits platform Health & wellbeing programs (mental health, sports, etc.) A collaborative environment where knowledge sharing is part of the culture Location Barcelona (with flexibility to work from other offices across Spain)