SIM & eSIM Connectivity Engineer

Proximus Global, combining the strengths of Telesign, BICS, and Route Mobile, is shaping the future of communications and digital identity.

Our mission is simple : to enable seamless global connectivity and trusted engagements that power the world's interactions.

Together, our solutions fuel innovation across the world's largest companies and emerging brands. With a truly global reach, we enable businesses to create engaging customer experiences while integrating fraud protection across the entire lifecycle.

Our portfolio covers global voice, messaging and data connectivity, alongside 5G and IoT solutions. It also includes digital identity, verification and CPaaS platforms for personalised, omnichannel engagement. Through these capabilities, we help businesses and communities stay connected, secure and ready to grow. Today, we reach more than 5 billion subscribers, secure over 180 billion transactions every year, and connect more than 1,000 destinations worldwide — delivering on our commitment to connect, protect and engage everywhere.

This role is based in Brussels and offered on a permanent contract. We follow a hybrid working model, with an expectation to be present in the Brussels office 2 to 3 days per week. Applicants must have the legal right to work in Belgium.

About the role

At Proximus Global, we're looking for a SIM & eSIM Connectivity Engineer to join our SIM for Things (SFT) team.
In this role, you will contribute to the design, implementation, and support of our SIM and eSIM ecosystem, covering physical SIMs, eUICCs, eSIM Hub platforms, SM-DP+, and Remote SIM Provisioning solutions. Working closely with product, operations, technology teams, vendors, and partners, you will help deliver reliable connectivity solutions for global IoT deployments.

You will be involved throughout the SIM and eSIM lifecycle, from solution design and device validation to provisioning, troubleshooting, and operational support, helping ensure a seamless experience for customers and partners.

What you'll do

• Support the design and implementation of SIM, eSIM, and Remote SIM Provisioning solutions in line with business and operational requirements.
• Contribute to the evolution and continuous improvement of SIM for Things, eSIM Hub, and provisioning platforms.
• Participate in implementation projects involving SIM vendors, profile providers, and ecosystem partners.
  Perform technical analyses, solution assessments, and impact evaluations for new requirements and integrations.
• Draft and maintain technical documentation, integration specifications, and operational procedures.
• Support the validation of SIM configurations, profiles, operating systems, and related technical components.
• Help manage SIM and eSIM lifecycle activities, including provisioning, activation, suspension, replacement, and termination processes.
• Collaborate with operational teams on SIM inventory management, ordering processes, and vendor onboarding activities.
• Execute and coordinate device interoperability testing and end-to-end validation activities.
• Verify compatibility between devices, SIMs, eSIM profiles, connectivity platforms, and mobile networks.
• Investigate and troubleshoot technical incidents involving devices, SIMs, eUICCs, profiles, and network integrations.
• Support integrations with external partners, including eSIM and profile management platforms.
• Provide technical support to internal stakeholders, customers, and business teams.
• Contribute to service monitoring, automation, operational excellence, and continuous improvement initiatives.
  

What you bring

• Experience & technical expertise
• Degree in Telecommunications, Computer Science, Information Technology, or a related field.
• 3-5 years of experience in telecom, IoT, mobile connectivity, or related technology environments.
• Experience working with SIM and/or eSIM technologies and mobile connectivity solutions.
• Good understanding of SIM lifecycle management, provisioning processes, and connectivity operations.
• Familiarity with GSMA eSIM standards and industry best practices.
• Experience testing connected devices and troubleshooting connectivity-related issues.
• Understanding of mobile network concepts, roaming, and IoT connectivity environments.
• Ability to analyse technical requirements and work effectively with vendors and technology partners.
• Experience working in cross-functional environments involving product, operations, and engineering teams.

Nice to have

• Knowledge of eSIM platforms such as SM-DP+, SM-DP/SR, or Remote SIM Provisioning solutions.
• Familiarity with SIM operating systems, applets, Java Card, or GlobalPlatform technologies.
• Exposure to SIM profile management, personalisation, or file system structures (EFs/DFs).
• Experience working with SIM manufacturers such as IDEMIA, Thales, G+D, Kigen, Workz, or similar vendors.
• Understanding of LTE-M, NB-IoT, 5G IoT, MVNO, or MVNE environments.
• Familiarity with cloud technologies, Kubernetes, AWS, or Azure.

Your soft skills

• Strong communication skills and ability to explain technical concepts clearly.
• Collaborative mindset and ability to work effectively in an international environment.
• Customer-oriented with a strong sense of ownership and accountability.
• Analytical and structured approach to problem solving.
• Well-organised, proactive, and able to manage multiple priorities.
• Eager to learn and continuously develop expertise in mobile connectivity technologies.