OT Systems Engineer

OT Systems Engineer Role Summary The OT Systems Engineer supports the design, implementation, and operation of secure, resilient systems infrastructure for hyperscale data centre OT environments in Siziano, Milan. The role focuses on Operational Technology systems including Building Management Systems (BMS), Electrical Power Monitoring Systems (EPMS), and other critical site infrastructure. Working closely with internal technology, engineering, operations, and vendor teams, you will help maintain system performance, reliability, and security while supporting troubleshooting, documentation, and continuous improvement in a high-availability environment. This is a hands-on, site-based role requiring regular presence across local data centre sites in the Siziano/Milan area. Key Responsibilities Deploy, configure, maintain, and optimise OT systems infrastructure across critical data centre environments. Support Windows, Linux, VMware, and virtualised platforms to maintain performance, resilience, security, and service continuity. Monitor system performance, identify issues or bottlenecks, and implement improvements to support high availability. Troubleshoot complex incidents, work with internal teams and vendors, and help drive root cause resolution and preventive actions. Support monitoring, patching, backup, maintenance, and documentation activities across OT systems. Apply security, operational, and regulatory best practices in a high-availability environments. Participate in out-of-hours or emergency support when required to maintain service continuity. What You’ll Bring Experience as a Systems Engineer in an enterprise, critical infrastructure, or data centre environment. Strong hands-on knowledge of Windows and Linux systems, VMware-based virtualisation, and secure, high-availability infrastructure. Experience with troubleshooting, systems administration, and operational support in complex technical environments. Understanding of security best practices, patching, backup, and system resilience. Experience with scripting or automation tools such as PowerShell or Ansible is beneficial. Familiarity with OT systems such as BMS, EPMS, SCADA, PLCs, or HMIs would be an advantage. Knowledge of SAN technologies, backup solutions, infrastructure cabling, Azure/cloud infrastructure, or relevant Microsoft/VMware certifications would be beneficial. Strong communication, problem-solving, and collaboration skills, with Italian and English language ability at B2/C1 level. Cosa offriamo / What we Offer Fascia Retributiva (RAL): 45.000 € - 57.000 € + premio di risultato. Contratto CCNL Commercio (Terziario, Distribuzione e Servizi). Buoni pasto e piano welfare aziendale. Assistenza sanitaria e accesso al fondo pensione complementare, secondo quanto previsto dal CCNL Contribuirai allo sviluppo e alla gestione di infrastrutture digitali mission-critical, operando in alcuni degli ambienti data centre più avanzati d'Europa. Cresci con STACK, acquisendo esperienza su progetti di grande scala e cogliendo concrete opportunità di crescita professionale all'interno di una piattaforma europea in forte espansione. La fascia retributiva indicata rappresenta il range previsto per il ruolo. La retribuzione sarà determinata in modo equo e trasparente all'interno di tale fascia, sulla base dell'esperienza professionale, delle competenze e delle qualifiche del candidato. Location requirement: Due to the hybrid nature of this role, candidates should be based close to Milan or have confirmed plans to relocate to the area. Please note that we cannot consider applicants based outside Italy for this opportunity. About STACK Infrastructure STACK is a proven, trusted partner for the world’s most innovative companies, designing, developing, and operating sustainable global digital infrastructure. Backed by an unmatched record of reliable delivery and development expertise, STACK brings speed, scale, certainty, and responsibility to the demands of a rapidly evolving digital infrastructure landscape. For more information about STACK, please visit: www.stackinfra.com