OT Network Engineer

OT Network Engineer Role Summary We are seeking an OT Network Engineer to support the design, implementation, and operation of secure, resilient network infrastructure for hyperscale data centre environments in Siziano, Milan. The role supports Operational Technology systems including Building Management Systems (BMS), Electrical Power Monitoring Systems (EPMS), and other critical site infrastructure. Working with internal technology, engineering, operations, and vendor teams, you will help maintain network availability, performance, and security while supporting troubleshooting, documentation, and continuous improvement. This is a hands-on, site-based role requiring regular presence across local data centre sites in the Siziano/Milan area. Key Responsibilities Design, implement, maintain, and optimise network infrastructure for OT environments across critical data centre sites. Install, configure, and support routers, switches, firewalls, and related network devices to maintain performance, resilience, and service continuity. Monitor network performance, investigate complex incidents, work with internal teams and vendors, and help drive root cause resolution and continuous improvement. Support monitoring, alerting, backup, testing, validation, and documentation activities across OT network systems. Apply security, operational, and regulatory best practices in a high-availability environment. Participate in out-of-hours or emergency support when required to maintain service continuity. What You’ll Bring Experience as a Network Engineer in an enterprise, critical infrastructure, or data centre environment. Strong hands-on experience with Cisco networking technologies, Fortinet security solutions, and network infrastructure including LAN/WAN, firewalls, switches, routers, wireless networking, VPN, OSPF, VLANs, and TCP/IP. Strong understanding of network security principles, troubleshooting, and operational support in high-availability environments. Experience supporting or working with OT systems such as BMS, EPMS, SCADA, PLCs, and HMIs is desirable. Knowledge of infrastructure cabling, monitoring, management, documentation, and reporting tools, with scripting or automation tools including Bash or Python an advantage. Awareness of standards and compliance requirements such as ISO, SOC 2, and PCI-DSS is beneficial. Strong analytical, problem-solving, collaboration, and communication skills in Italian and English, with commitment to accurate technical documentation and disciplined operational processes. A degree in Computer Science, Information Systems, Network Engineering, or a related discipline is preferred, although equivalent practical experience will also be considered. 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