Senior Technical Account Manager, OT Cybersecurity

The Senior Technical Account Manager (TAM) is a practitioner-level technical leader for our most strategic customers operating Operational Technology (OT) and Industrial Control System (ICS) environments across sectors such as energy and utilities, manufacturing, oil and gas, water, and critical infrastructure. You will own the technical relationship end to end, ensuring our cybersecurity platform is architected, deployed, and operated correctly in environments where availability and safety come first.
We are looking for someone who has spent real time in plants, substations, and control rooms; who can read a network diagram and spot the flat Level 2 network, the dual-homed engineering workstation, or the unmanaged vendor remote-access path; Ideally, you have done this work at an OT cybersecurity company and understand how security products succeed or fail in the field.
As an Advanced (IC5) individual contributor, you will operate with a high degree of autonomy, lead the most complex deployments and escalations, set technical standards for the TAM function, and mentor other TAMs and customer-facing engineers.
Strategic Customer Technical Ownership
Serve as the senior technical owner for a portfolio of large enterprise and critical infrastructure customers, including multi-site and multi-region deployments
Build trusted-advisor relationships across OT/controls engineering, plant operations, IT/network teams, security operations, and executive leadership (CISO, VP Operations, Plant Managers)
Develop and maintain a deep, documented understanding of each customer’s OT architecture, asset inventory, network topology, vendor ecosystem, and risk posture
Lead executive business reviews and technical roadmap sessions that tie platform adoption to measurable risk reduction and operational outcomes
OT Architecture & Secure Deployment
Design and validate deployments aligned to the Purdue Enterprise Reference Architecture and ISA/IEC 62443 zones and conduits, including placement in industrial DMZs (Level 3.5)
Guide customers through deployments that touch PLCs, RTUs, HMIs, historians, engineering workstations, and safety systems from vendors such as Rockwell, Siemens, Schneider Electric, Honeywell, Emerson, ABB, and GE
Plan and execute changes within customer change-management, maintenance-window, and management-of-change (MOC) processes, with zero tolerance for unplanned operational impact
Advise on secure third-party and vendor remote access, privileged access, and zero trust architectures for OT
Networking & Advanced Troubleshooting
Act as the final technical escalation point for complex issues spanning network, identity, security, and platform layers
Diagnose behavior of industrial protocols such as Modbus TCP, DNP3, EtherNet/IP (CIP), PROFINET, OPC UA/DA, IEC 61850, and IEC 60870-5-104, and understand how security controls affect them
Lead root-cause analysis and incident post-mortems, and drive durable fixes with Support, Engineering, and the customer
Cybersecurity Advisory & Compliance
Advise customers on OT security program maturity, segmentation strategy, access control, monitoring, and incident response readiness
Help customers map platform capabilities to frameworks and regulations including ISA/IEC 62443, NIST SP 800-82, NIST CSF, NERC CIP, TSA security directives, and CISA guidance
threat groups, ICS-specific malware, CISA ICS advisories) and translate it into practical recommendations for customers
Support customer audits, assessments, and security questionnaires with accurate, defensible technical detail
Represent the voice of the customer to Product and Engineering with well-structured, prioritized field insights and requirements grounded in real OT use cases
Partner with Sales and Account Management as the lead technical voice on renewals, expansions, and complex upsells
Author and own reference architectures, deployment playbooks, runbooks, and best-practice guides used across the TAM and Support teams
Mentor and coach other TAMs and customer-facing engineers; help raise the technical bar of the function
7+ years in technical customer-facing or hands-on engineering roles (e.g., Technical Account Manager, Sales/Solutions Engineer, OT Security Engineer, Controls/Automation Engineer, ICS Network Engineer, or Professional Services Consultant), with a meaningful portion focused on OT/ICS
Practitioner-level, hands-on experience in industrial environments — configuring, supporting, or securing PLCs, HMIs, SCADA/DCS systems, historians, and engineering workstations in live production settings. Cybersecurity
Deep, hands-on experience deploying and operating security controls in OT and IT environments, such as secure remote access, zero trust network access, privileged access management, network segmentation, firewalls, and OT asset visibility/threat detection. Networking
Strong, practitioner-level networking skills: TCP/IP, routing and switching, VLANs, subnetting, NAT, firewall policy, VPNs, and packet-level troubleshooting. Comfortable reading and challenging network architecture diagrams and working directly in network gear
Industrial protocols
Working knowledge of common industrial protocols (Modbus, DNP3, EtherNet/IP, PROFINET, OPC UA, and similar) and how they behave across segmented networks
Proven track record as the lead technical owner for large enterprise or critical infrastructure accounts in regulated, mission-critical environments
able to explain complex technical risk clearly to controls engineers, security teams, and executives alike
Experience at an OT/ICS cybersecurity company (e.g., OT secure remote access, OT asset visibility and threat detection, or industrial network security vendors)
Background in a plant, utility, or industrial operations environment, or with a system integrator or automation OEM
Relevant certifications such as GICSP, GRID, GCIP, ISA/IEC 62443 Cybersecurity Expert, CISSP, CCNP, or equivalent
Familiarity with identity and access technologies (SAML/OIDC, Active Directory/Entra ID, MFA) and with virtualization/cloud platforms (VMware, Azure, AWS)
S. security clearance or background screening
Strategic customers view you as their go-to OT cybersecurity advisor, not just a vendor contact
Complex deployments land safely, on schedule, and with no unplanned operational impact
Customer environments measurably improve in security posture, and platform adoption grows across sites
Your field insight directly shapes the product roadmap
At Dispel you’ll be rewarded and recognized for your performance in an environment that will challenge you and give you clear direction on what it takes to succeed in your role as well as provide development for other roles you may be interested in.
Generous paid time off and holidays
Performance bonus and equity eligible
Remote work
Medical, vision, dental insurance