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

> GSSTech Group · Dubai, United Arab Emirates · — · Posted 2026-03-05

**Workplace:** on_site

## Description

### Job Overview

We are seeking an experienced **OT Penetration Tester** with strong expertise in **wireless communication networks**, particularly **GSM and RF Mesh**, within **AMI / Smart Grid environments**.

The role focuses on evaluating the **security, resilience, and performance of wireless infrastructure used in Advanced Metering Infrastructure (AMI)** by conducting controlled testing and vulnerability assessments across communication protocols and networks.

### Key Responsibilities

### Wireless Network Security Testing

-   Perform **penetration testing and security assessments** on **RF Mesh and private GSM communication networks** used in OT environments.
-   Identify vulnerabilities in wireless communication channels, authentication mechanisms, and data transmission processes.

### Functional Input / Output Validation

-   Conduct **black-box testing** by sending varied inputs such as meter readings, commands, and alarms to **RF mesh and GSM networks**.
-   Validate system outputs such as acknowledgments, alerts, and error responses.
-   Test **DLMS/COSEM protocol communication** for structured metering data transmission.
-   Evaluate communication using **Wireless M-Bus** for sub-metering and IoT-based devices.

### Network Resilience & Interference Testing

-   Simulate environmental disruptions such as:

-   **Signal jamming**
-   **Node failures**
-   **Network congestion**

-   Evaluate system recovery mechanisms and **data integrity in RF mesh multi-hop networks and GSM infrastructure**.
-   Assess network performance across different **frequency bands (e.g., 902–928 MHz for RF mesh)** used in large-scale AMI deployments.

### Data Transmission Security & Protocol Compliance

-   Evaluate **encrypted DLMS communication** across RF mesh and GSM networks.
-   Test vulnerabilities in **authentication, integrity validation, and protocol implementation**.
-   Validate **Wireless M-Bus communication standards**, particularly in **868 MHz frequency bands** used for low-power metering devices.

### Performance & Scalability Testing

-   Perform **stress testing and load simulations** to replicate peak AMI usage scenarios.
-   Test network behaviour during **simultaneous communication from thousands of smart meters**.
-   Evaluate **latency, throughput, and system scalability** in event-driven and scheduled data transmission environments.

## Requirements

### OT / Industrial Security

-   Experience in **OT penetration testing** within **ICS / Smart Grid / AMI environments**
-   Understanding of **SCADA and industrial communication systems**

### Wireless Network Expertise

-   Hands-on experience with:

-   **RF Mesh networks**
-   **Private GSM networks**
-   **Wireless communication protocols**

### Industrial Protocols

Strong knowledge of:

-   **DLMS/COSEM**
-   **Wireless M-Bus**
-   AMI communication protocols
-   Smart meter communication frameworks

### Networking & Security

-   Wireless network security testing
-   Encryption and authentication testing
-   Vulnerability assessment
-   Network resilience and interference analysis

### Preferred Experience

-   Experience in **Smart Grid / AMI infrastructure security testing**
-   Knowledge of **IoT and smart metering ecosystems**
-   Exposure to **frequency spectrum regulations and wireless deployment standards**
-   Experience with **industrial penetration testing tools**

### Education

-   Bachelor’s degree in **Cybersecurity, Computer Science, Telecommunications, or related field**

### Experience

-   **5+ years** in **Cybersecurity / Penetration Testing**
-   Hands-on experience with **OT / Industrial Network Security**

## Apply

[Apply at GSSTech Group](https://apply.workable.com/gsstech-group/j/69CB655EF1/apply)

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