SIM and Device Engineer

KORE Wireless; Mucking; On-site; GBP 50,000 - 70,000; Full time

Job summary

A leading telecommunications company in the UK is seeking a SIM and Device Engineer responsible for managing the lifecycle of SIM profiles and ensuring compatibility with various device architectures. The ideal candidate will possess a Bachelor's Degree in Engineering and have expertise in new SIM technologies, authentication algorithms, and network architectures. This role involves troubleshooting customer issues, coordinating with SIM manufacturers, and contributing to technology trials, providing a dynamic and impactful opportunity in a fast-paced environment.

Qualifications

• Expertise in SIM applets and key management.
• In-depth knowledge of authentication algorithms like Milenage.
• Experience with Key Ceremony and BAP/BAT processes.
• Understanding of network architecture across generations (2G-5G).

Responsibilities

• Manage the complete lifecycle of KORE SIM profiles.
• Provide technical expertise in SIM and network interactions.
• Assist in implementing new technology trials.
• Troubleshoot customer issues related to SIM products.

Skills

Expertise in new SIM architectures

Knowledge of authentication algorithms

Experience with network monitoring tools

Ability to analyze and correlate test results

Excellent organizational, oral, and written communication skills

Education

Bachelor's Degree in Engineering or equivalent experience

Tools

Wireshark

Netscout

QXDM

Java

C

Python

Job description

The SIM and Device Engineer role reporting to Senior Director SIM Engineering is responsible for delivery of technical specifications and manage the comprehensive delivery of SIM profiles and applets for SIM/ eSIM / eUICC / iSIM products. A thorough understanding of device, SIM, and network interactions and flows is essential, as you will play a pivotal role in ensuring KORE secures and retains substantial new business.

• Manage KORE SIM profiles development and its complete lifecycle from design all the way up to deployment. Create and maintain profile specs, validate new SIM & applet products, ensure interoperability with SIM and communication on IoT modules for product launch and go-to-market activities.
• Develop and maintain the relationships with SIM manufacturers on a day-to-day basis.
• Provide technical expertise evidenced by possessing a comprehensive understanding of devices, SIM cards, networks, and the associated tools for logging and fault diagnosis.
• Assist the SIM Engineering team and Product Management in implementing new technology trials (e.g., eUICC, 5G, iSIM), including sourcing test equipment and conducting quality assurance tests.
• Manage queries about SIM products and serve as the subject‑matter expert on SIM and applet capabilities for internal stakeholders.
• Help troubleshoot SIM‑related customer issues and advise customers on SIM and applet compatibility.
• Issue resolution – leading cross‑functional coordination to satisfactory closure, providing timely, responsive and consistently high‑quality support to stakeholders and customer troubleshooting calls.
• Manage time effectively – balancing priorities and workload through clear and consistent prioritisation and decision making.
• Manage and report the status of issues – with clear ownership, next steps, and timescales. Keep stakeholders informed and manage expectations.
• Close the loop on root cause analysis – using data to create actionable recommendations for longer‑term remediations and future product improvements.
• Active contribution to KORE's knowledge management materials.

Qualifications

• Bachelor's Degree in Engineering or equivalent experience.
• Expertise in new SIM architectures, SIM applets (e.g., Multi‑IMSI), key management, cryptographic functions, SIM secure elements, and SIM card applet development.
• In‑depth knowledge of authentication algorithms (e.g., Milenage) and essential algorithms (e.g., 3DES, AES, RSA, ECC).
• Experience with Key Ceremony, proficiency in BAP/BAT process.
• Experience with Wireshark / PCAP logging, Netscout for network monitoring / call flow tracing, COMPRION or SIMtrace, QXDM, hardware logs, AT commands / consoles.
• Understanding of 2G/3G/4G/5G network architecture, network service provisioning, OTA (SCP‑02, 80, 81), Remote SIM Provisioning (RSP), and 3GPP protocols.
• In‑depth knowledge of industry standards: 3GPP 31.111, 31.102, ISO 7816, ETSI 102 221, 102 223, 102 671, GSMA SGP‑02, etc.
• Passion for working on new technologies in a fast‑paced and frequently changing environment.
• Ability to analyse and correlate test results, producing conclusions and recommendations to KORE's leadership team.
• Experience with technical writing including creating guides / technical reports.
• Excellent organizational, oral, and written communication skills.
• Detailed understanding of core network design (Layer 4+).
• IoT module test / development experience (e.g., Quectel, ublox, Telit).
• IoT device firmware development / test experience (e.g., Teltonika, customer specific).
• Experience with software development using Java, C and/or Python, SIM APDU / applet development / test experience.