1GLOBAL is a technology-driven global mobile communications provider dedicated to empowering enterprises worldwide to unlock the full growth potential of mobile connectivity. With a best-in-class telecom technology platform, a comprehensive suite of globally viable regulatory licenses, and privileged access to the telecom wholesale market, 1GLOBAL is uniquely positioned to deliver seamless compliance and connectivity solutions. Serving the world’s leading banks, corporations, and digital-first businesses—including neo-banks, travel companies, and payment service providers—1GLOBAL connects over 43 million devices globally.
With 2024 full-year revenue exceeding US$100 million, 1GLOBAL is a profitable business generating significant cash flows to fund its ongoing investments in infrastructure, transformation, and growth. 2024 saw major client wins and marked 1GLOBAL’s evolution from a multi-market telecommunication provider to a global technology-driven mobile connectivity powerhouse.
Established in 2022 by experienced tech founders and entrepreneurs Hakan Koç and Pyrros Koussios, 1GLOBAL is a European technology leader driving digital transformation in the global telecommunications market. It operates as a fully regulated Mobile Virtual Network Operator (“MVNO”) in nine countries and as a regulated telecommunications operator in an additional 31 countries. Headquartered in the Netherlands, with world-class R&D hubs in Lisbon, Berlin, and São Paulo, 1GLOBAL employs over 450 experts across 13 countries.
Position Overview
You will be part of an international team, driving the development of 1GLOBAL's online charging and billing platform. We are looking for a talented developer and team player, capable of designing and implementing new services, maintaining existing components, and testing our applications.
We are looking for someone with a strong track record in a role in technology teams at product-led growth companies, with special focus on online charging. You will be part of a dynamic team driving the Mediation, Charging and Billing solution delivery and the full life-cycle of our product lines.
The team is based in Lisbon.
Key Responsibilities
- Create and maintain charging products, offers and rate plans
- Engineer new charging system solutions and maintain existing ones
- Perform end-to-end project planning and delivery
- Creation and maintenance of technical documentation
- Deploy solutions in lab and production environments
- Create the appropriate visibility of the relevant service KPI's
- Quality control and assurance of offers and rate plans
- Anticipate capacity and performance issues
- Collaborate closely with other teams as well as with external partners
- Contribute towards continuous improvement of the teams’ engineering standards and working methodologies
- Lead end-to-end project deliveries on the Charging area
- Manage scope, timeline, and quality of the technical streams.
- Drive requirements gathering, use case definition, and ensure technical feasibility of the solution.
- Coordinate with solution architects, network core experts, OSS/BSS teams, integrators and vendors.
- Oversee impact analysis, configuration, testing, and deployment of charging/rating logic and integration with network elements (PCRF, DRA, OCS, etc.).
- Ensure compatibility and seamless migration between versions.
- Drive current system and network enhancements/optimizations/decommissions.
- Manage technical risks, issues, and dependencies across system interfaces (e.g., IN, OCS, mediation).
- Own and deliver area reporting, dashboards, and executive summaries to stakeholders.
- Ensure alignment with best practices, change management, security and release control policies.
Requirements
Must Have
- Extensive engineering experience with Charging services and systems, from commercial and open-source solutions
- Hands on operational and delivery experience with maintenance and implementation of solutions in live and lab environments
- Expertise in mobile services charging (offline, online), using Diameter (Ro, Gy, Gx, Sy). Experience onone or more of these protocols is a plus: CAPv2, CAPv3, SIP, RADIUS, LDAP, and/or Web Service protocols
- Expertise in Online Charging Systems and it's integration with Provisioning and Billing systems
- Expertise in service design related with voice, messaging and data services (including policy and charging control)
- Expertise in IMS architecture, especially with VoWiFi and VoLTE use cases
- Previously integrated mobile services and solutions with offline and online charging systems
- Experience in dedicated service solutions, data only, applicable to enterprise/corporate environments (M2M/IoT solutions and services)
- Experience successfully designing and implementing Rating / Mediation solutions
- Experience in troubleshooting issues related with signaling, provisioning or configuration
- Good understanding on GSM, UMTS, LTE related technologies, systems, and protocols
- Support of real-time charging and policy enforcement for latency-sensitive 5G use cases.
- Previous experience in automation, test, delivery, solution design and capacity management
Nice to Have
- Having a degree in Telecom Engineering or Computer Science or equivalent is a big plus
- Good understanding of 5G ecosystem. Experience on any of the following areas is a plus:
- Design and implementation of charging solutions aligned with 5G core network functions (e.g., SMF, AMF, PCF, CHF).
- Configuration and management of Charging Function (CHF) in the Service-Based Architecture (SBA) environment of 5G.
- Ensuring compliance with 3GPP 5G specifications, particularly for TS 32.255, 32.296, 32.290, 29.522, and others.
- Definition of charging rules, data rating models, and tariff plans for new 5G services (eMBB, URLLC, mMTC).
- Collaboration with policy control (PCF) and subscriber data management (UDM) teams to align charging strategies.
- Contributions to open-source projects is a big plus
- Experience with Network Functions Virtualization is a big plus
- Familiarity with MVNO/MVNE/MVNA architecture(s) and landscape is a big plus
- English proficiency mandatory, other languages are a plus
Benefits
Why 1GLOBAL?
- Growth Opportunities: Advance your career in one of the fastest growing telecommunications companies, expanding over 40% 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.