OT Systems Engineer — Secure, High-Uptime Infra

Nearfield Instruments; Rotterdam; On-site; EUR 70,000 - 100,000; Full time

Job summary

Nearfield Instruments is seeking a hands-on Senior Systems Administrator & Infrastructure Engineer to support and improve the OT environment inside our products. You will ensure uptime, security, and maintainable systems across Windows and Linux servers, virtualization, storage, and network components.

The role covers troubleshooting, RCAC and access controls, disaster recovery, and cross-functional collaboration with Software, Production, Service and IT teams.

Qualifications

• Around 5 years of hands-on experience in systems administration, infrastructure engineering, OT, industrial automation, or product environments.
• Strong networking skills, including routing, switching, VLANs, DNS, gateways, VPNs, and firewalls.
• Experience with packet-level troubleshooting using Wireshark, tcpdump or similar tools.
• Hands-on experience with Windows Server, including Active Directory, Group Policy, patching, permissions, and security hardening.
• Hands-on experience with Ubuntu/Linux administration, including services, updates, permissions, networking, and logging.
• Experience troubleshooting communication between servers, controllers, control boxes, sensors and machine subsystems
• Experience with virtualization platforms such as Hyper-V, VMware, QEMU or equivalent
• Hands-on experience with RAID configuration, storage management, backup, restore, and disaster recovery.
• Experience implementing and managing RBAC, access control, and least-privilege security models
• Experience performing vulnerability assessments and security remediation
• Security-oriented mindset with strong attention to hardening, system integrity and incident handling
• Preferably located in the Netherlands
• Experience performing vulnerability assessments and security remediation
• Security-oriented mindset with strong attention to hardening, system integrity and incident handling

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 Role-Based Access Control (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

Networking

Wireshark

tcpdump

Windows Server

Ubuntu/Linux

Active Directory

Group Policy

Patching

Security hardening

RBAC

RAID

Storage management

Disaster recovery

VLANs

VPNs

Hyper-V

VMware

QEMU

Tools

Hyper-V

VMware

QEMU

Job description

Nearfield Instruments is seeking a hands-on Senior Systems Administrator & Infrastructure Engineer to support and improve the OT environment inside our products. You will ensure uptime, security, and maintainable systems across Windows and Linux servers, virtualization, storage, and network components.

The role covers troubleshooting, RCAC and access controls, disaster recovery, and cross-functional collaboration with Software, Production, Service and IT teams.