1 GLOBALis a technology-driven global mobile communications leader, built to help enterprises unlock the full potential of mobile connectivity at scale. Powered by a best-in-class telecom platform – including its own owned and operated global mobile core network, a full end-to-end e SIM technology stack, and an extensive portfolio of telecom licenses – 1 GLOBAL operates as a fully regulated telecommunications provider across 40 countries worldwide. With privileged access to the global wholesale telecom market, we deliver seamless, compliant, and scalable connectivity solutions anywhere in the world.We serve many of the world's leading banks, enterprises, and digital-first businesses, including neo-banks, fast-moving consumer goods companies, travel leaders, and payment service providers. Today, 1 GLOBAL connects more than70 millionpeople and devices globally, enabling our customers to launch, scale, and innovate with confidence in the mobile ecosystem.1 GLOBAL is a profitable, fast-growing business. With full-year revenues exceedingUS$200 millionand profits of overUS$25 million, we generate strong cash flows and fund our growth independently, continuously investing in infrastructure, platform innovation, and global expansion.Founded in 2022 by experienced technology entrepreneursHakan KoçandPyrros Koussios, 1 GLOBAL has rapidly emerged as a European technology leader shaping the future of global telecommunications. We operate as a fully regulated Mobile Virtual Network Operator (MVNO) in 12 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, our team of close to 500 experts across 15 countries is united by a single ambition: to redefine global mobile connectivity through technology, scale, and execution excellence.Position OverviewWe are seeking a highly skilledOracle ECE and OCOMC Expertto 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, and providing the technical knowledge and skills to manage and monitor OCS with high levels of service availability and accuracy.Key ResponsibilitiesSystem ExpertiseAct as the subject‐matter expert onOracle ECE(real‐time rating and charging) andOCOMC(offline charging mediation), focusing on network integration (Diameter protocol), ECE customization, monitoring, and system optimization for high‐volume usage events.Ensure seamless integration between charging, mediation, and billing systems, and participate in the design and implementation of complex business and technical requirements.Contribute to capacity planning, performance tuning, and platform evolution to keep the system resilient and cost‐efficient as the business scales.Training & EnablementDevelop 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 SupportCollaborate 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 improve monitoring tools and methodology; knowledge of Grafana, Prometheus, and Loki integration and development is a must.RequirementsMust HaveProven expertise inOracle ECEandOCOMCplatforms for 3 years or more.Strong knowledge of real‐time rating, charging, and mediation flows.Strong knowledge of charging Diameter protocol.Experience withSQLand 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 HavePrior experience leading billing teams or training programs.Experience with high‐volume event processing in telecom or digital services industries.BenefitsGrowth Opportunities : Advance your career in one of the fastest growing telecommunications companies, expanding by over 100 % year‐on‐year.Major Transaction Exposure : Be in the driver's seat for transactions that shape the future of the telco industry.Work with a Talented Team : Collaborate daily with senior management, founders, and renowned external advisors.Dynamic Work Environment : Thrive in a collaborative, fast‐paced workplace where innovation is encouraged.Professional Development : Work alongside industry experts to enhance your skills in a cutting‐edge field.International Experience : Opportunities to work in different 1 GLOBAL offices worldwide.Open Communication Culture : Your ideas are heard, and open dialogue is encouraged.Results‐Driven Attitude : Join a team that values efficiency, creativity, and tangible impact.1 GLOBAL is an equal opportunity employer; we value your character as much as your talent. Diversity drives our innovation, and we offer a collaborative, dynamic, and international work environment. We are excited for you to join our mission to revolutionise connectivity globally.