Fortinet OT Security Engineer
Zappsec Technologies Inc.

About the role
Zappsec secures operational technology environments for clients in manufacturing, energy, utilities, and process industries. OT means the control systems that run physical processes, as distinct from corporate IT.
You will segment plant networks with Fortinet, build policy from observed industrial traffic, and give clients visibility into assets they currently cannot see. You will do it without stopping production.
This is a hands-on engineering role. Availability comes first in these environments. You will monitor before you block and alert before you enforce.
Certification requirement
Fortinet certification at NSE 5 level or above is mandatory for this role. This is a hard requirement, not a preference.
Fortinet has renamed its program twice in recent years, so read this before you rule yourself out.
- Certifications issued between October 2023 and July 2026 used the FCP, FCSS, and FCX names. FCP covered the NSE 4 to NSE 6 band. FCSS mapped to NSE 7. FCX mapped to NSE 8.




- Fortinet returned to NSE 1 through NSE 8 numbering in July 2026.
- If your certification sits at NSE 5 or higher under either naming, you meet the requirement.

What you will own
Segmentation and architecture
- Map the client estate against the Purdue model and agree the zone and conduit design under IEC 62443.
- Design and build the industrial demilitarised zone between the plant network and corporate IT.
- Place FortiGate at cell and area boundaries, including ruggedised models on the plant floor.
- Use transparent mode and virtual domains where the client cannot accept routing changes.
- Segment legacy assets that cannot be patched, upgraded, or taken offline.

Industrial protocol control
- Write policy for industrial protocols including Modbus TCP, DNP3, IEC 60870-5-104, IEC 61850, EtherNet/IP, PROFINET, S7comm, BACnet, and OPC UA.
- Apply the Fortinet industrial security service for protocol-aware application control an

📌 Fortinet OT Security Engineer (India)
🏢 Zappsec
📍 India