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

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.

SIM Engineer II

Key skills