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Sr. OT Network Engineer
- Manassas, Virginia, United States
- Manassas, Virginia, United States
Über
JOB DESCRIPTION Architecture & Design
Design and implement a segmented OT network architecture transitioning from flat Layer 2 networks to SD-WAN-enabled, zone-based architectures.
Define network segmentation strategy (ISA/IEC 62443 zones and conduits model) to isolate critical OT assets and control east-west traffic.
Engineer ring and/or resilient topologies across substations and core OT sites to ensure deterministic communication and fault tolerance.
Develop SD-WAN design standards including:
Underlay/overlay architecture
Path selection policies (latency, jitter, packet loss)
QoS forICS protocols (e.g., DNP3, Modbus, IEC61850)
Security & Compliance
Develop and enforce OT-specific cybersecurity controls, including micro‑segmentation, firewall zoning, and least‑privilege access.
Define and implement firewall policies to restrict inter‑zone communication and prevent unauthorized access to OT systems.
Conduct risk and vulnerability assessments aligned with OT threat models (ransomware, lateral movement, supply chain risks).
Ensure compliance with NERCCIP standards and other applicable frameworks.
Implementation & Operations
Lead deployment of SD‑WAN solutions across OT sites, including integration with existing switching infrastructure (e.g., industrial‑grade switches).
Configure and maintain high availability mechanisms:
Redundant paths and failover (active/active or active/standby)
Rapid spanning tree / ERPS / MPLS‑TP where applicable
Support incident response and root cause analysis for OT network disruptions.
Manage projects and deliver on time with periodic status reports to management.
BASICQUALIFICATIONS
10+ years of experience in network design and architecture, preferably in OT environments.
Experience with industrial protocols (e.g., Modbus, DNP3, OPC, Ethernet/IP).
Familiarity with IT/OT convergence principles.
DESIREDSKILLS
Strong understanding of networking concepts, including routing, switching, and firewall configurations.
Proficiency in network monitoring and management tools.
Knowledge of cybersecurity best practices for OT networks.
Experience with industrial control systems (ICS) and SCADA systems.
MINIMUM TECHNICAL EXPERIENCE
Knowledge of design, configuration, installation, testing, and maintenance of local and wide area computer wired and wireless networks (Cisco Systems preferred).
Knowledge of computer network characteristics, network operating system software, and network components.
Troubleshooting skills and the ability to diagnose/resolve network system problems.
Ability to interpret and apply complex technical manuals and reference materials.
Ability to assist with developing network security and related procedures; and performing network management activities.
EDUCATIONREQUIREMENTS
Bachelor’s degree in computer science, computer networks, or a related field.
Certification in related fields (CCNA, CCNP) required. Security and Cisco Certified Internetwork Expert (CCIE), and experience in Extreme network switches is a plus.
Arena Technical Resources, LLC, (ATR) is an Equal Opportunity Employer (EOE) who will provide equal employment opportunity to employees and applicants for employment without regard to race, ethnicity, religion, color, sex, pregnancy, national origin, age, veteran status, ancestry, sexual orientation, gender identity or expression, marital status, family structure, genetic information, or mental or physical disability.
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Sprachkenntnisse
- English
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