Roaming IREG Engineer

1GLOBAL is 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 our own owned and operated global mobile core network, a full end-to-end eSIM technology stack, and an extensive portfolio of telecom licenses – 1GLOBAL operates as a fully regulated telecommunications provider across 40 countries worldwide. Combined with our privileged access to the global wholesale telecom market, this positions us uniquely to 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, 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 exceeding US$200 million and profits of over US$25 million, we generate strong cash flows and fund our growth independently—continuously investing 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 telecommunications offerings.  

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. 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 Overview

1Global is seeking a talented and detail-oriented Roaming IREG Engineer to manage the entire roaming process and procedures. As an IREG Engineer you will be responsible for the technical setup, testing, and maintenance of international roaming and interconnect services.
We’re looking for a proactive individual with a strong technical foundation, adept at troubleshooting support cases and enhancing operational processes for seamless footprint updates. 

Key Responsibilities

• Plan, execute, and document IREG tests (IR.24, IR.35, IR.50, etc.) for voice, SMS, and data services, in line with GSMA standards.
• Set up and verify interconnect links for voice and messaging services with partner operators.
• Monitor roaming service KPIs, troubleshoot issues, and ensure compliance with roaming agreements.
• Configure and test SS7, Diameter, SIP, and related signaling protocols for international connectivity.
• Liaise with foreign operators, roaming hubs, and internal teams during implementation and troubleshooting.
• Maintain up-to-date test results, network configurations, and operational procedures.
• Oversee the footprint management of all 1Global products, working closely with the wholesale and other networks team. 

Requirements

Must Have

• Perform end-to-end roaming testing (voice, SMS, data, CAMEL, VoLTE, 5G roaming).
• Execute IREG test cases according to GSMA guidelines and bilateral agreements.
• Analyze and troubleshoot roaming issues with signaling traces and logs.
• Work closely with international roaming partners to resolve interconnect problems.
• Manage and update roaming documentation (IR.21)
• Support new roaming launches (testing and activation of new operators, technologies, and services).
• Coordinate with internal teams (Core Network, Billing, etc) during testing and troubleshooting.
• Validate TAP files and charging/billing aspects of roaming services.
• Monitor KPIs and performance of roaming services after launch.
• Follow-up and define Quality and Performance indicators for the entire roaming service.
• Close relationship with external partners like carriers, service providers.
• Have successful partnerships with other departments and teams.

Nice to Have

• Degree in Telecom Engineering or Computer Science or equivalent experience
• Knowledge of 3GPP, ETSI, standards and specifications for SIM/eSIM
• Knowledge and experience with protocols such as MAP, S6a
• Familiar with an RSP architecture and experience operating it
• Knowledge in scripting and have basic programming skills.
• Experience with protocol analyzer tools like Wireshark, Astelia, and ability to use them to troubleshoot networks errors/problems for the mentioned protocols
• Experience with ETSI NFV architecture and solutions
• Familiar with MVNO/MVNE/MVNA architecture(s) and landscape

Benefits

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.