1GLOBAL is a technology-driven global mobile communications provider, delivering global connectivity solutions to enterprises and consumers. Powered by a best-in-class telecom platform with its own owned and operated global mobile core network in 15 countries, fully fledged in-house developed eSIM technology, and an extensive portfolio of telecom licenses; 1GLOBAL operates as a fully regulated telecommunications provider across 43 countries worldwide. The company serves many of the world’s leading banks, multinational enterprises, global retailers and digital-first businesses, including neo-banks, global fast moving consumer goods companies, travel leaders, and payment service providers. Today, 1GLOBAL connects more than 80 million people and devices globally, enabling our customers to launch, scale, and innovate with confidence in the mobile ecosystem. 1GLOBAL is a profitable, fast-growing business. With full-year revenues in 2025 exceeding US$200 million and profits of over US$25 million, we generate strong cash flows to fund our growth allowing us to continuously invest in infrastructure, platform innovation, and global expansion. In 2026 also the parent of the Lidl Group acquired a 10% interest in 1GLOBAL as part of a deal for Lidl to offer globally to its 180 million consumers communication services. Recent years have marked a defining phase in 1GLOBAL’s journey, with major enterprise and mass-consumer client wins accelerating its evolution into a global mobile connectivity powerhouse, purpose-built to enable consumer brands to enter and succeed with their own aspirations to offer telecommunications services to their clients. Founded in 2022 by experienced technology entrepreneurs, Hakan Koç and Pyrros Koussios, 1GLOBAL has rapidly emerged as a European technology leader shaping the future of global telecommunications. It operates as a fully regulated Mobile Virtual Network Operator (MVNO) in 15 countries and as a regulated telecom operator in an additional 28 markets. Headquartered in the Netherlands, with world-class R&D hubs in Lisbon, Berlin, and São Paulo, its team of close to 550 experts across 16 countries is united by a single ambition: to redefine global mobile connectivity through technology, scale, and execution excellence. Position Overview We are seeking a highly skilled Oracle ECE and OCOMC Expert to strengthen our charging and billing operations and empower our charging & billing team. The ideal candidate will possess deep expertise in Oracle’s charging and mediation platforms, with the ability to translate complex technical concepts into practical training for non‑technical billing staff. This role bridges IT and business operations, ensuring accurate, scalable, and efficient handling of large volumes of usage events and billing data, in real time, providing team the technical knowledge and skills to manage and monitoring OCS in a way that delivers high levels of service availability to our customers with high level of accuracy in usage events rating, earning from our customers their trust and confidence in the service 1GLOBAL provide them. This role positions the expert as both a technical authority in Oracle ECE / OCOMC and a trainer who empowers the billing team to handle large volumes of usage events effectively and securely. Key Responsibilities System Expertise System Expertise Act as the subject matter expert on Oracle ECE (real‑time rating and charging) and OCOMC (offline charging mediation), with special focus on the following areas: Network integration (Diameter protocol) ECE customization Monitoring Configure, optimize, and maintain the charging system for high‑volume usage events. Ensure seamless integration between charging, mediation, and billing systems. Participate in the design and implementation of complex business and technical requirements, ensuring robustness, scalability, and alignment with Oracle’s best practices. Contribute to capacity planning, performance tuning, and platform evolution to keep the system resilient and cost-efficient as the business scales. Training & Enablement Develop and deliver structured training programs for the billing team, focusing on maintenance, operation, and monitoring of ECE and OCOMC. Create clear documentation, guides, and best practices tailored to billing operations. Conduct workshops and hands‑on sessions to build confidence in analyzing event‑level data. Operational Support Collaborate with IT, Finance, and Operations to streamline billing workflows. Provide guidance on troubleshooting discrepancies in rated events, mediation records, and invoices. Recommend improvements to reporting and data access, including the use of replicated databases for secure read‑only queries. Help in improve monitoring tools and methodology (knowledge on integration and development of monitoring tools in Grafana, Prometheus, Loki is a must) Requirements Must-haves Proven expertise in Oracle ECE and OCOMC platforms, for 3 years or more Strong knowledge of real‑time rating, charging, and mediation flows . Strong knowledge of charging diameter protocol Experience with SQL and database query optimization for large datasets. Excellent communication and presentation skills; ability to train and mentor non‑technical staff. Understanding of telecom and subscription‑based billing models. Nice-to-haves Prior experience leading billing teams or training programs. Experience with high‑volume event processing in telecom or digital services industries. Benefits Why 1GLOBAL? Growth Opportunities: Advance your career in one of the fastest growing telecommunications companies, expanding over 50% year-on-year under the leadership of successful tech entrepreneurs. Major Transaction Exposure: Be in the driver’s seat for transactions that will have an impact on the future telco industry. Work with a Talented Team: From the Board and the Founders to the Senior Management Team, you will collaborate daily with the most capable and renowned external ad