Voice and Services Engineer (São Paulo/Rio de Janeiro Based)

About Us

1GLOBAL is a technology-driven global mobile communications provider helping enterprises and consumer brands deliver seamless connectivity worldwide. Powered by a best-in-class telecom platform, proprietary eSIM technology, and its own mobile core network across 15 countries, 1GLOBAL operates as a fully regulated telecommunications provider in 43 countries. Founded in 2022, 1GLOBAL has rapidly become one of Europe's fastest-growing telecom technology companies, connecting more than 80 million people and devices globally. Our customers include leading banks, multinational enterprises, global retailers, travel companies, payment service providers, and digital-first businesses. Headquartered in the Netherlands, with R&D hubs in Lisbon, Berlin, and São Paulo, 1GLOBAL employs over 550 professionals across 16 countries. With annual revenues exceeding US$200 million and a strong track record of profitability, we continue to invest in innovation, infrastructure, and international expansion as we redefine the future of global mobile connectivity.

About the Team

As a Network Engineering member, in the Voice and Services functional area, you will be responsible to propose, analyze and define the requirements for new and existing services and systems, related with the voice systems under the responsibility of the functional area. Prepare, design, test and provide new solutions or product changes of the already existing portfolio. Define and support the technology evolution roadmap for the systems under the functional area. Participate and support the other functional areas in cross functional projects.

About the Role

• Collaboration with other Networks teams in defining and managing the projects for delivery of new solutions
• Project delivery.
• Network design.
• Integration and migration strategy definition.
• Collaboration with other relevant departments.
• Responsible for end-to-end delivery
• Design of new consumer and corporate telecom solutions
• Creation of technical documentation (HLD’s, LLD’s, WO’s, etc.) and maintain it over the lifecycle of the solutions
• Perform implementations in live environment.
• Understanding of End to End system testing requirements
• Follow-up and define Quality and Performance indicators
• Capacity and Performance Analysis, Reporting and Improvement
• Solution Definition
• Service & Resource configuration definition and implementation on requested systems
• Work on complex solutions that influence the design of current products and addresses design issues for future products or technologies
• Close relationship with external partners like carriers, service providers
• Elaborate, and manage the process, for change requests to current partners in order to meet the network necessities
• Control the network elements roadmap, being responsible for the necessary software/hardware upgrade during the components lifecycle
• Generate and implement process improvements, including and especially cross-team processes
• Documents the existing technology portfolio and proposes recommendations for improvements and/or alternatives

Requirements

About You

Must Have

• Proven experience on implementation of live solutions on mobile telecom (GSM, UMTS, LTE, IMS), networks design, capacity management, engineering and architecture
• Knowledge of 3GPP, GSMA, ITU standards and specifications
• Experience in the design, test and operation of NGN based networks, including MSS/MGW, HLR/HSS, SBC
• Experience in defining, establishing and maintaining voice interconnects, SIP/RTP based
• Understanding about IMS architecture.
• Knowledge about VoIP, VoLTE, VoWiFi, and QoS
• Experience with SMS service configuration and routing
• IMS Architecture with understanding of IMS nodes including P/S/I-CSCF, Application Servers
• IMS Protocol Interfaces – GM Interface, ISC interface, Sh Interface, Cx, SOAP/XML, etc.
• Experience in mobile services charging (offline, online).
• Knowledge and experience of OCS and, Ro, Ro+, Ga and Bp interfaces
• Knowledge and experience with Diameter/SCTP networks and protocol
• Knowledge and experience with Signaling Gateways and protocols including SS7, SIGTRAN, MAP and CAMEL
• 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
• English proficiency mandatory, other languages are a plus
• Degree in Telecom Engineering or Computer Science or equivalent experience

Nice to Have

• +3 years working on telecoms, designing and implementing mobile core networks
• Previous experience with Nokia, Oracle and Ribbon IMS products

Benefits

What we offer?

• CLT contract — enjoy job stability and reliable benefits that value your work
• Quarterly performance bonuses to reward your hard work and achievements
• Meal allowance paid into Caju card — R$100 per working day
• Health insurance with SulAmérica — 50% covered by the company
• Extended parental leave — 180 days of maternity leave and 20 days of paternity leave
• Daycare allowance