SIM Engineer

Cubic3; Ireland; On-site; EUR 70,000 - 110,000; Full time

Benefits offered by this job

25 days annual leave plus 2 company‑s.

Health Insurance

Pension Contribution

ESOP

Tax saver scheme

Bike to work scheme

Sports and social activities

Office outings

Bits & Bobs days

Learning and Development Opportunities

Job summary

Cubic3 in Ireland is seeking a SIM Engineer II to join the expanding SIM Engineering team. You will support SIM/eSIM solutions across automotive, agriculture, and transport sectors, including OTA provisioning and RSP ecosystems.

You will design, validate, and maintain electrical profiles, develop Java Card applets, and produce technical documentation while collaborating with cross‑functional teams. A proactive, analytical mindset and mentoring abilities are valued.

Qualifications

• 3–6 years in a technology organisation, preferably telecoms, with SIM/eSIM/OTA R&D experience.
• Experience with smart card test & trace tools (e.g., Comprion).
• Proactive and open‑minded with analytical and problem‑solving skills.
• Ability to work unsupervised and take responsibility for task completion.
• Good knowledge of SIM/eSIM architecture and protocols (APDU, ISO 7816).

Responsibilities

• Support design, validation, and maintenance of electrical profiles for SIM/eSIM products.
• Design and implement Java Card applets for SIM/eSIM services, adhering to 3GPP/ETSI/GSMA standards.
• Write and maintain technical docs (applet specs, electrical profiles, APIs, test plans).
• Collaborate with cross‑functional teams (mobile core, security, IoT vendors).
• Develop, test, and support SIM‑based applications within the SIM/eSIM ecosystem.
• Mentor peers and contribute to process improvements.

Skills

SIM/eSIM/OTA engineering

APDU/ISO7816

Analytical mindset

Problem solving

Independent work

Mentoring/lead small teams

Strong communication

Education

Third level qualification in Engineering or Computer Science

Tools

Git

Confluence

Jira

Comprion

Postman API

DataDog

Zabbix

MULTOS / secure element OS

Job description

Responsibilities

• We are seeking an energetic, enthusiastic SIM Engineer II to join the expanding SIM Engineering team, supporting Cubic’s growing customer base and solutions portfolio
• The SIM Engineering team delivers Cubic solutions in the SIM/eSIM Remote SIM Provisioning technology domain, executing state‑of‑the‑art technology projects with global connectivity reach to the automotive, agriculture, and transport industries. We design, develop, and support connectivity solutions leveraging remote SIM provisioning platforms, managing a complex ecosystem of SIM/eSIM technologies, providing SIM/eSIM card logistics and fulfilment, and supporting a global customer base
• You will have the opportunity to work with emerging connectivity technologies including 5G, non‑terrestrial networks, and the evolution of eSIM to the latest GSMA specifications. You should enjoy working proactively in a dynamic, highly flexible environment and bring a positive, open, and analytical mindset to the team
• 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
• This is an excellent opportunity for a SIM Engineer II to gain hands‑on experience of the complete end‑to‑end process of SIM/eSIM ordering and provisioning, SIM/eSIM Over‑the‑Air (OTA) infrastructure and management, SIM Remote SIM Provisioning (RSP) solutions for M2M and IoT, SIM–device–network interaction, and more
• You’ll work in a small team of experienced engineers at the cutting edge of M2M and IoT eSIM technologies, supporting technical teams across full end‑to‑end solutions and gaining exposure to diverse technical areas

Benefits

• 25 days annual leave + 2 company days
• Health Insurance
• Pension Contribution
• ESOP
• Tax saver scheme
• Bike to work scheme
• Sports and social activities
• Great annual office outings (Summer BBQ, Christmas party, charity runs)
• Bits & Bobs days (Half day every quarter to get your Bits & Bobs done)
• Learning and Development Opportunities

Qualifications

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