ON.energy is seeking a Senior Network Engineer to design, secure, and maintain network infrastructure of Operational Technology (OT) environments. This role requires deep expertise across network topologies, troubleshooting, and security, with a strong preference for hands-on experience securing industrial control networks using Palo Alto firewalls and Moxa switches.
KEY RESPONSIBILITIES- Design, implement, and maintain OT network architectures, including LAN/WAN, wireless, and industrial network segments.
- Configure, manage, and troubleshoot Palo Alto next-generation firewalls to enforce network security policy and segmentation between OT zones.
- Deploy and maintain Moxa industrial switches and other ruggedized networking hardware in OT environments.
- Diagnose and resolve complex network issues across routing, switching, and security layers, minimizing downtime in production and industrial settings.
- Design and maintain VLAN structures, subnetting schemes, and IP addressing plans across OT networks.
- Configure and manage NAT, VPN tunnels, and site-to-site/remote access connectivity.
- Implement and maintain High Availability (HA) network designs to ensure resilience of critical infrastructure.
- Apply network security best practices, including segmentation, access control, monitoring, and hardening of OT networks.
- Collaborate with controls, automation, and cybersecurity teams to support integration of PLCs, SCADA systems, and industrial PCs onto the network.
- Document network designs, standard operating procedures, and change management records.
REQUIRED QUALIFICATIONS - Expert-level knowledge of network topologies and structured troubleshooting methodology.
- Strong hands-on proficiency with TCP/IP, VLANs, routing, switching, subnetting, and NAT.
- Demonstrated experience designing and supporting site-to-site and remote access VPNs.
- Solid understanding of network security principles and High Availability design.
- Experience working within Operational Technology (OT) environments and an understanding of IT/OT network segmentation.
- Bachelor's degree in a related field, or equivalent professional experience.
PREFERRED QUALIFICATIONS - Hands-on expertise with Palo Alto firewalls (policy configuration, App-ID, segmentation, VPN, and monitoring).
- Experience deploying and managing Moxa industrial switches.
- Familiarity with Siemens PLCs and industrial control system architectures.
- Experience with SEL (Schweitzer Engineering Laboratories) protective relay and communication devices.
- Experience networking and supporting Industrial PCs in production/OT environments.
- Familiarity with Ignition SCADA platform and its network/architecture requirements.
- Proficiency administering both Windows and Linux environments.
- Relevant certifications such as PCNSE, CCNA/CCNP, or similar are a plus.
CORE TECHNICAL SKILLS Category Skills Networking Fundamentals
TCP/IP, VLANs, Routing, Switching, Subnetting, NAT
Security
Palo Alto Firewalls, VPNs, Network Security, High Availability
OT Hardware
Moxa Switches, Siemens PLCs, SEL Devices, Industrial PCs
Software/Platforms
Ignition SCADA, Windows, Linux
For US-based roles - What you'll get:- Competitive salary + annual performance-based bonus eligibility
- Medical, dental, and vision insurance
- 401(k) with company match
- Paid time off and company holidays
For Mexico-based roles - What you'll get:- Competitive salary + annual performance bonus eligibility
- Christmas Bonus (Aguinaldo): 30 days
- Major medical expenses and life insurance
- Paid time off and holidays (per local policy)
For all roles:- Professional development and growth opportunities
- Opportunity to grow with a mission-driven team shaping the future of clean energy
- Benefits vary by role and location and are subject to change.
