# OT Penetration Tester - Wireless (GSM / RF Mesh)

> GSSTech Group · Dubai, United Arab Emirates · — · Posted 2026-03-23

**Workplace:** on_site

## Description

### **Role Overview**

We are looking for a highly specialised **OT Penetration Tester** with strong experience in **wireless communication networks (GSM and RF Mesh)** within **AMI / Smart Metering environments**.

This role focuses on **black-box security testing of OT networks**, validating communication flows, resilience, and protocol-level vulnerabilities across large-scale distributed infrastructure.

### **Key Responsibilities**

### **1\. Wireless OT Penetration Testing (Core)**

-   Perform **black-box penetration testing** on **RF Mesh and private GSM networks** in AMI environments
-   Simulate real-world attack scenarios without access to internal system logic
-   Test communication between **smart meters, concentrators, and head-end systems**

### **2\. Functional & Protocol Validation**

-   Validate input/output behaviour using:

-   Meter readings
-   Commands
-   Alerts / alarms

-   Verify expected responses such as:

-   Data acknowledgements
-   Error handling

-   Work with protocols:

-   **DLMS/COSEM**
-   **Wireless M-Bus**

### **3\. Network Resilience & Interference Testing**

-   Simulate:

-   Signal jamming
-   Node failure
-   Packet loss scenarios

-   Assess:

-   Network recovery
-   Data integrity
-   Stability of **multi-hop RF mesh networks**

-   Work across frequency bands like:

-   **902–928 MHz (RF Mesh)**
-   **GSM spectrum**

### **4\. Security & Data Transmission Testing**

-   Analyse **encrypted communication flows** (without decryption)
-   Identify vulnerabilities in:

-   Authentication
-   Data integrity
-   Transmission security

-   Ensure compliance with OT communication standards

### **5\. Performance & Scalability Testing**

-   Conduct stress testing for:

-   High-volume meter data transmission
-   Large-scale AMI deployments

-   Evaluate:

-   Latency
-   Throughput
-   Network congestion handling

### **Mandatory Skills (Non-Negotiable)**

-   Strong experience in **OT Security / ICS environments**
-   Hands-on **wireless penetration testing (GSM / RF Mesh)**
-   Experience with **AMI / Smart Metering systems**
-   Knowledge of:

-   **DLMS/COSEM protocol**
-   **Wireless M-Bus**

-   Understanding of:

-   RF communication (frequency bands, interference, propagation)
-   Mesh network architecture (multi-hop networks)

### **Good to Have**

-   Experience with **SCADA / ICS security testing**
-   Knowledge of **IoT / embedded device security**
-   Familiarity with tools for **RF analysis / wireless testing**

## Apply

[Apply at GSSTech Group](https://apply.workable.com/gsstech-group/j/CB442BE379/apply)

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