SIM Over-The-Air (OTA) Developer

SIM Over-The-Air (OTA) Developer

Contract Type

12-Month Contract (Extendable based on project needs)

Location

Remote/Hybrid/Onsite (as applicable)

Start Date

TBD

Role Overview

We are seeking experienced SIM Over-The-Air (OTA) Developers to support the design, development, deployment, and maintenance of OTA solutions for SIM/eSIM platforms. The role focuses on secure remote provisioning, life cycle management, and updates of SIM profiles across large-scale mobile networks.

Key Responsibilities

• Design, develop, and maintain SIM OTA applications in compliance with 3GPP and GSMA standards

• Implement secure OTA messaging for SIM/eSIM provisioning, updates, and life cycle management

• Integrate OTA platforms with HSMs, SMSCs, SMPP gateways, and mobile core systems

• Develop and manage SIM Toolkit (STK)/CAT-TP based applications

• Support eSIM (Remote SIM Provisioning - RSP) workflows including profile download, enablement, and deletion

• Perform OTA testing, validation, and troubleshooting across multiple devices and operators

• Ensure compliance with security, encryption, and key management standards

• Collaborate with network, security, and platform teams to deliver end-to-end OTA solutions

• Provide documentation, deployment support, and knowledge transfer

Required Skills & Experience

Technical Skills

• Strong experience in SIM OTA technologies

• Hands-on experience with:

  • SIM Toolkit (STK)/Java Card

  • OTA protocols (SMS-PP, CAT-TP, SCP80/SCP81)

  • 3GPP, ETSI, and GSMA specifications

• Experience with eSIM/RSP architecture

• Knowledge of cryptography, key management, and secure messaging

• Familiarity with SMPP, SMSC integration, and mobile network environments

• Programming experience in Java, C/C++, or Python

Domain Knowledge

• Mobile telecom ecosystems and SIM life cycle management

• SIM personalization, provisioning, and OTA security domains

Preferred/Nice-to-Have

• Experience with OTA platforms (eg, Thales, G+D, IDEMIA, or equivalent)

• Exposure to IoT SIM/eSIM deployments

• Experience working with HSMs and secure key injection

• Familiarity with CI/CD pipelines in telecom environments

• Prior experience in large-scale operator or MVNO environments