Mobile Core Engineer (Sim for Things) M/W/X
Proximus Global is seeking a Mobile Core Engineer to join their SIM for Things team. This role involves designing and delivering mobile core solutions for IoT connectivity, requiring a degree in Telecommunications or IT and approximately 6 years of experience in a telecom or IT environment. The ideal candidate will have strong expertise in IoT connectivity, eSIM, and Remote SIM Provisioning, along with excellent communication and project management skills. This position offers a competitive salary and benefits, with a requirement to work from the Brussels office 2 to 3 days per week.
About the role
At Proximus Global, we're looking for a Mobile Core Engineer to join our SIM for Things (SFT) team.
In this role, you will design and deliver end-to-end mobile core solutions for IoT connectivity, working at the intersection of technology, product, and operations. From requirements to production, you'll take ownership of solutions and help shape the evolution of our platforms.
You'll collaborate closely with cross-functional teams to ensure high-quality, scalable solutions and a seamless customer experience.
What you'll do
- Design and validate technical solutions aligned with business, operational, and regulatory requirements
- Contribute to the roadmap and evolution of mobile core platforms
- Lead or support end-to-end implementation projects, including design, rollout and optimisation
- Draft and review functional & technical specifications and RFPs
- Drive architecture and impact analysis, and produce technical documentation
- Collaborate closely with operations, product, and marketing teams
- Act as a technical reference point, supporting internal and external stakeholders
What you bring*Experience & technical expertise**
- Degree in Telecommunications, IT, or related field
- ~6+ years of experience in a telecom or IT environment
- Strong experience with IoT / M2M connectivity platforms, including SFT
Solid understanding of
- eSIM & Remote SIM Provisioning, including GSMA SGP.31/32
- SIM lifecycle management & provisioning workflows
- Multi-tenant environments & large-scale device connectivity
- Experience with SIM file systems, applets, and SIM ordering processes
Nice to have
- Knowledge of mobile core components, including 2G/3G/LTE, HLR, HSS, PCRF, etc.
- Understanding of protocols: HTTP, SS7, Diameter, MAP, GTP
- Experience in roaming, IoT, MVNO/MVNE environments
- End-to-end view of mobile core architecture and call flows
Your soft skills
- Strong communicator, able to translate technical concepts for different audiences
- Collaborative team player in an international environment
- Customer-focused with a strong sense of ownership
- Analytical, structured, and solution-oriented
- Proactive, with solid organisation and project management skills
- Comfortable navigating complexity and prioritising effectively
Your Benefits
- A competitive base salary and short-term incentives, including a yearly bonus linked to individual and company performance
- Comprehensive insurances including hospitalization insurance, outpatient care insurance, life insurance, disability insurance and travel insurance, fully funded by PXG
- A supplementary pension plan, fully funded by PXG
- A flexible mobility package including a company car or car allowance, a mobility budget for flexible commuting including a fuel card, bike lease options, etc.
- A telco offer including free internet at home, budget for a mobile phone, a monthly phone plan and many discounts on the Proximus products catalog
- Additional benefits such as meal and eco vouchers, 32 vacation days, corporate discounts through Benefits@Work, ...
- Wellbeing at work: yoga and pilates classes, corporate events, etc.