Senior OT/IT Systems Engineer — High-Uptime Infrastructure

Nearfield Instruments; Rotterdam; Hybrid; EUR 70,000 - 110,000; Full time

Job summary

Nearfield Instruments seeks a hands-on Senior Systems Administrator & Infrastructure Engineer to support the OT environment inside our products. This role focuses on product control systems, Windows/Linux servers, virtualization, storage, and network security to ensure uptime and reliability.

You will troubleshoot across software, OS, networking, and hardware, implement secure baselines, and collaborate with Software, Production, Service, and IT teams to resolve complex product issues.

Qualifications

• 5+ years of infrastructure / systems administration experience in an OT, industrial, or product environment.
• Experience with Windows Server and Linux administration.
• Strong networking knowledge (routing, DNS, firewalls, VPNs, packet-level troubleshooting).
• Experience troubleshooting across infrastructure, software, networks, servers, and hardware components.
• Ability to independently design, implement, and own infrastructure solutions end-to-end.
• Broad infrastructure knowledge across compute, networking, storage, and security.
• Strong collaboration and clear communication with technical and non-technical stakeholders.

Responsibilities

• Operate and improve product control systems and infrastructure with a strong focus on uptime, security, recovery, and supportability
• Troubleshoot complex connectivity, communication, and performance issues across network, operating system, virtualization and storage layers
• Diagnose and resolve communication issues between servers, control boxes, sensors, machine controllers, and product subsystems
• Analyze network traffic and communication protocols using tools such as Wireshark, tcpdump and packet captures
• Support product issues by identifying root causes, separating infrastructure and software problems, and escalating with clear evidence
• Manage networking components including subnets, routing, VLANs, DNS, gateways, NAT, VPNs, managed switches and firewall rules
• Build and maintain site-to-site VPNs and remote access solutions
• Administer Windows Server and Ubuntu/Linux systems used within the product environment
• Configure, maintain, and troubleshoot virtualization platforms such as Hyper-V, QEMU, VMware, or equivalent technologies
• Configure and troubleshoot RAID arrays, storage controllers, backup solutions, disaster recovery processes, and data recovery activities
• Implement and maintain RBAC, Active Directory permissions, service accounts, and least-privilege access models
• Strengthen security through hardening, patching, access control, secure baselines, vulnerability remediation and structured change management
• Perform vulnerability assessments, security remediation, malware validation, antivirus validation and security compliance checks
• Keep documentation, monitoring, backup, and recovery processes up to date
• Work closely with Software, Production, Service, and IT teams when product issues require cross-functional troubleshooting
• Participate in incident response and on-call support when needed

Skills

Windows Server

Linux administration

Networking knowledge

Troubleshooting across infra

End-to-end infra design

Collaboration & communication

Tools

Wireshark

tcpdump

packet captures

Job description

Nearfield Instruments seeks a hands-on Senior Systems Administrator & Infrastructure Engineer to support the OT environment inside our products. This role focuses on product control systems, Windows/Linux servers, virtualization, storage, and network security to ensure uptime and reliability.

You will troubleshoot across software, OS, networking, and hardware, implement secure baselines, and collaborate with Software, Production, Service, and IT teams to resolve complex product issues.