Senior Network Engineer

ON.energy • Houston, TX

8d

About The Position

ON.energy is building the power infrastructure that makes the AI era possible. As AI demand surges past what the grid and traditional data centers can support, ON.energy provides a new class of power technology proven at gigawatt scale and trusted by the world’s leading cloud and AI companies. Our systems are already deployed across 2.5 GW of hyper-scale campuses, validated by top U.S. national labs, and certified for grid-safe operation by major utilities. With real products in the field, we’re scaling faster than the grid can, transforming power from a bottleneck into a competitive advantage for the companies building the future. 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.

Requirements

• 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.

Nice To Haves

• 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.

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.

Benefits

• Competitive salary + annual performance-based bonus eligibility
• Medical, dental, and vision insurance
• 401(k) with company match
• Paid time off and company holidays
• Christmas Bonus (Aguinaldo): 30 days
• Major medical expenses and life insurance
• Paid time off and holidays (per local policy)
• Professional development and growth opportunities
• Opportunity to grow with a mission-driven team shaping the future of clean energy

What This Job Offers

• Job Type: Full-time
• Career Level: Senior