SIM Engineer II

Role Overview

• Support the design, validation, and maintenance of electrical profiles for SIM and eSIM products
• Design and implement Java Card applets for SIM/eSIM services, working to 3GPP, ETSI, and GSMA standards
• Write and maintain technical documentation (e.g. applet specification, electrical profile specifications, APIs, test plans)
• Collaborate with cross-functional teams (mobile core network, security, IoT device vendors, smart card (eUICC) vendors)
• Develop, test, and support SIM-based applications and tools supporting SIM applications and their integration within the SIM/eSIM ecosystem
• Contribute to peer review of electrical test data and reports, supporting the technical growth of team members

Requirements

• Third level qualification in a technology discipline such as Engineering, Computer Science, or similar
• 3–6 years’ experience working in a technology organisation, preferably telecoms technology, with up to 3 years’ experience in SIM/eSIM/OTA engineering R&D
• Experience with Remote SIM Provisioning technologies (GSMA SGP.02, GSMA SGP.22/SGP.32)
• Good knowledge of SIM/eSIM architecture and protocols (APDU, ISO 7816)
• Familiarity with 3GPP/ETSI standards relevant to SIMs (e.g., TS 31.102, TS 102.221)
• Experience with smart card test & trace tools (e.g., Comprion)
• Understanding of secure coding practices and cryptographic protocols
• Proficiency with version control systems (e.g., Git) and development tools
• Knowledge of SIM operating systems for secure elements (e.g., MULTOS, native SIM OS)
• Experience working with MNOs or handset OEMs and familiarity with mobile network elements (HSS, OTA platforms, test SIMs)
• Experience/knowledge of Postman API, Java, C#, SQL, scripting knowledge
• Experience with monitoring and alerting tools (e.g., DataDog, Zabbix)
• Proactive and open-minded with analytical and problem-solving skills
• Fast learner with curiosity and quality focus
• Ability to work unsupervised and take responsibility for task completion
• Effective communication skills.
• Familiarity with Atlassian tools (Confluence, Jira) (desirable)
• Experience working in a Kanban model (desirable)
• Demonstrable problem-solving ability and new perspectives on existing solutions (desirable)
• Independent work ethic and willingness to contribute to process improvements (desirable)
• Ability to guide and mentor less experienced colleagues and lead small project teams (desirable)

Tech Stack

• IoT
• Java
• SQL
• TypeScript

Benefits

• Flexible arrangement of up to eight work-from-home days per month after probation