Oracle ECE Developer - Lisbon Based

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 - including its own owned and operated global mobile core network, fully fledged in-house developed eSIM technology, and an extensive portfolio of telecom licenses - 1GLOBAL operates as a fully regulated telecommunications provider across 40 countries worldwide.

We serve many of the world's leading banks, enterprises, and digital-first businesses, including neo-banks, global fast moving consumer goods companies, travel leaders, and payment service providers. Today, 1GLOBAL connects more than 70 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. Recent years have marked a defining phase in our journey, with major enterprise and mass-consumer client wins accelerating our 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 Ko and Pyrros Koussios, 1GLOBAL 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 So 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 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 nontechnical 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 (realtime 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 highvolume 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 handson sessions to build confidence in analyzing eventlevel 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 readonly queries
• Help in improve monitoring tools and methodology (knowledge on integration and development of monitoring tools in Grafana, Prometheus, Loki is a must)
  
  

Must Have

• Proven expertise in Oracle ECE and OCOMC platforms, for 3 years or more
• Strong knowledge of realtime 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 nontechnical staff
• Understanding of telecom and subscriptionbased billing models

Nice to Have

• Prior experience leading billing teams or training programs
• Experience with highvolume event processing in telecom or digital services industries
  
  

Why 1GLOBAL

• Growth Opportunities: Advance your career in one of the fastest growing telecommunications companies, expanding over 100% 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 advisors, and constantly being exposed to talented and driven individuals
• Dynamic Work Environment: Thrive in a collaborative, fast-paced workplace where innovation is encouraged, and every contribution counts
• Professional Development: Work alongside industry experts to enhance your skills and knowledge in a cutting-edge field
• International Experience: Gain opportunities to work in different 1GLOBAL offices around the world as you grow within the company
• Open Communication Culture: Join a team where your ideas are heard, and open dialogue is encouraged, fostering a supportive and transparent work environment
• Get Things Done Attitude: Be part of a results-driven team that values efficiency, creativity, and the drive to make a tangible impact in the industry

1GLOBAL 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.