Hss And Signalling Engineer - Lisbon Based

1global; Almada; Presencial; EUR 60 000 - 90 000; Tempo integral

Resumo da oferta

1GLOBAL is seeking an experienced Signalling Engineer to design, implement, and optimize signaling in mobile core networks. You will collaborate across teams to define requirements, build documentation, and ensure end-to-end delivery of new solutions.

The role demands strong knowledge of GSM/UMTS/LTE/IMS, 3GPP/GSMA/ITU standards, and experience with DIAMETER, SIGTRAN, and signaling interconnects. Lisbon-based positions with international exposure are available.

Qualificações

• Proven experience implementing live mobile telecom solutions.
• Experience in 3GPP/GSMA/ITU standards and specs.
• Strong background in signalling networks: STPs, HLR/HSS, SIGTRAN, and DIAMETER.

Responsabilidades

• Lead design and delivery of signalling solutions for mobile core networks.
• Define and support technology roadmap for signalling systems.
• Perform live implementations and end-to-end testing in live environments.
• Develop and maintain technical documentation (HLDs/LLDs).
• Analyze capacity, performance, and optimization requirements.
• Collaborate with partners to manage interconnects and MVNO/MVNE/MVNA setups.

Conhecimentos

GSM/UMTS/LTE/IMS

Signalling design

3GPP/GSMA/ITU

HLR/HSS knowledge

DIAMETER/SIGTRAN

Network protocols

IMS architecture

Ro/Gy/Gx interfaces

5G SA signalling

Wireshark/Astelia

Formação académica

Degree in Telecom Engineering or CS

Ferramentas

Wireshark

Astelia

Descrição da oferta de emprego

About the Company 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 Koçand 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.

About the Team As a Network Engineering member in the Signalling functional area, you will be responsible for proposing, analysing, and defining the requirements for new and existing services and systems related to the signalling routing area and subscriber data management systems under the functional area. You will prepare, design, test, and provide new solutions or product changes to the existing portfolio. You will define and support the technology evolution roadmap for the systems under the functional area, and participate and support the other functional areas in cross-functional projects.

About the Role

Collaboration with other Networks teams in defining and managing projects for delivery of new solutions.

Project delivery, network design, integration and migration strategy definition - responsible for end-to-end delivery.

Design of new consumer and corporate telecom solutions.

Creation and maintenance of technical documentation (HLDs, LLDs, WO's, etc.) throughout the solution lifecycle.

Perform implementations in live environments with a full understanding of end-to-end system testing requirements.

Follow-up and definition of quality and performance indicators.

Capacity and performance analysis, reporting, and improvement solution definition.

Service and resource configuration definition and implementation on requested systems.

Work on complex solutions that influence the design of current products and address design issues for future products or technologies.

Maintain close relationships with external partners such as carriers and service providers.

Elaborate and manage processes for change requests to current partners to meet network necessities.

Control the network elements roadmap, being responsible for necessary software/hardware upgrades during the components lifecycle.

Generate and implement process improvements, including cross-team processes.

Document the existing technology portfolio and propose recommendations for improvements and/or alternatives.

Requirements About You Must-haves

Proven experience implementing live solutions on mobile telecom (GSM, UMTS, LTE, IMS), network design, capacity management, engineering and architecture.

Knowledge of 3GPP, GSMA, ITU standards and specifications.

Experience in the design, testing, and operation of signalling network functions, including STPs, DEA/DRAs, and HLR/HSS.

Experience in defining, establishing, and maintaining signalling interconnects, SIGTRAN, and DIAMETER-based, using SCTP multi-homing.

Experience with HLR/HSS, subscriber profiles, subscriber repositories, and respective reference interfaces.

Knowledge of IMS architecture with understanding of IMS nodes, including Application Servers and its interaction with profile repositories.

Experience in mobile services charging (online). Knowledge of and experience with Ro, Gy, Gx interfaces.

Knowledge and experience with signalling protocols and routing including M3UA, M2PA, DIAMETER, as well as upper-layer protocols such as MAP, CAMEL, Sh, Cx.

Knowledge of 5G SA networks, from a signalling (SCP and SEPP) and AUSF/UDM/UDR perspective.

Experience with protocol analyser tools like Wireshark, Astelia, and ability to use them to troubleshoot network 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-t o-haves

+3 years working on telecoms, designing and implementing mobile core networks.

Previous experience with Nokia, Oracle, or HPE products.

Growth opportunities - advance your career in one of the fastest growing telecommunications companies.

Major transaction exposure - be in the driver's seat for transactions that will impact the future telco industry.

Work with a talented team - collaborate daily with senior management and renowned external advisors.

Dynamic work environment - thrive in a collaborative, fast-paced workplace where innovation is encouraged.

Professional development - learn from industry experts and enhance your skills.

International experience - opportunities to work in different 1GLOBAL offices worldwide.

Open communication culture - ideas are heard, and open dialogue is encouraged.

Results-driven mindset - focus on efficiency, creativity, and 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.

Hss And Signalling Engineer - Lisbon Based Caparica, Portuguese Republic, PT