Proximus

Mobile Core Engineer (Sim for Things)

Proximus
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4 months ago
Brussels, BelgiumSenior

Responsibilities

  • Design and validate technical solutions against 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 optimization.
  • Draft and review functional technical specifications and RFPs.
  • Drive architecture and impact analysis and produce technical documentation.
  • Collaborate with operations, product, marketing, and other cross-functional teams.
  • Act as a technical reference point for internal and external stakeholders.

Requirements

  • Degree in Telecommunications, IT, or a related field.
  • At least 6 years of experience in a telecom or IT environment.
  • Strong experience with IoT/M2M connectivity platforms, including SIM for Things.
  • Strong understanding of eSIM Remote SIM Provisioning, including GSMA SGP.31/32, SIM lifecycle management, and provisioning workflows.
  • Experience with multi-tenant environments and large-scale device connectivity.
  • Experience with SIM file systems, applets, and SIM ordering processes.
  • Knowledge of mobile core components such as 2G/3G/LTE, HLR, HSS, and PCRF is preferred.
  • Understanding of HTTP, SS7, Diameter, MAP, and GTP protocols is preferred.
  • Experience in roaming, IoT, or MVNO/MVNE environments is preferred.
  • Strong communication, collaboration, customer focus, analytical, organizational, and problem-solving skills.

Benefits

  • Competitive base salary and short-term incentives, including a yearly performance-linked bonus.
  • Hospitalization, outpatient care, life, disability, and travel insurance fully funded by Proximus Global.
  • Supplementary pension plan fully funded by Proximus Global.
  • Flexible mobility package with a company car or car allowance, mobility budget, fuel card, and bike lease options.
  • Telco benefits including free home internet, mobile phone budget, monthly phone plan, and discounts on Proximus products.
  • Meal and eco vouchers, 32 vacation days, corporate discounts, and wellbeing activities such as yoga and pilates.
  • The role requires working from the Brussels office two to three days per week, is not fully remote, and is offered on a permanent contract rather than freelance.

Categories

Proximus

About Proximus

10,000+ employees

Proximus is a Brussels‑headquartered telecom group that provides mobile, fixed broadband, TV, and ICT/cloud services to consumers and enterprises in the Benelux. It operates domestic brands such as Proximus, Scarlet, Mobile Vikings, and Tango, and runs international units BICS, Telesign and Route Mobile for carrier services, CPaaS and digital identity. Proximus is publicly traded and majority-owned by the Belgian state.

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