HSS and Signalling Engineer - São Paulo/Rio de Janeiro Based

1GLOBAL; Região Geográfica Intermediária de São Paulo; On-site; BRL 167,400 - 279,000; Full time

Benefits offered by this job

CLT contract providing job stability

Quarterly performance bonuses

Meal allowance

Health insurance

Extended parental leave

Daycare allowance

Job summary

1GLOBAL is seeking a Network Engineering member to work on telecom solutions in São Paulo. You will design and manage projects, ensuring the delivery of new telecom solutions while collaborating with various teams.

The ideal candidate should have extensive experience in mobile telecom networks, knowledge of network design standards, and expertise in signalling protocols. Join a dynamic team and be part of shaping the future of global connectivity.

Qualifications

• Proven experience implementing live solutions on mobile telecom networks.
• Experience designing, testing and operating signalling network functions.
• Knowledge of IMS architecture and its interaction with profile repositories.

Responsibilities

• Collaborate on projects for new solutions delivery.
• Design networks, define integration and migration strategies.
• Create and maintain technical documentation throughout the solution lifecycle.

Skills

Network design

Capacity management

Engineering and architecture

Understanding 3GPP, GSMA, ITU standards

Signalling protocols knowledge

English proficiency

Education

Degree in Telecom Engineering, Computer Science or equivalent

Tools

Wireshark

Astelia

Job description

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, 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 leading banks, enterprises, and digital‑first businesses, including neo‑banks, FMCG companies, travel leaders, and payment service providers. Today, 1GLOBAL connects more than 70 million people and devices globally, enabling customers to launch, scale, and innovate with confidence in the mobile ecosystem.

1GLOBAL is a profitable, fast‑growing business. Full‑year revenues in 2025 exceeded 200 million USD and profits over 25 million USD, allowing continued investment in infrastructure, platform innovation, and global expansion.

Founded in 2022 by technology entrepreneurs Hakan Koçand and Pyrros Koussios, 1GLOBAL rapidly emerged as a European technology leader shaping the future of global telecommunications. We operate as a fully regulated MVNO in 12 countries and as a regulated telecom operator in an additional 28 markets. Headquartered in the Netherlands with R&D hubs in Lisbon, Berlin and São Paulo, the team of close to 500 experts across 15 countries unites behind 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 propose, analyse and define requirements for new and existing services and systems related to the signalling routing area and subscriber data management systems.

Responsibilities include preparing, designing, testing and providing new solutions or product changes to the existing portfolio, supporting the technology evolution roadmap for the systems under the functional area, and collaborating with other functional areas on cross‑functional projects.

About the Role

• Collaborate with other Networks teams in defining and managing projects for the delivery of new solutions.
• Deliver projects, design networks, define integration and migration strategy, collaborate with relevant departments, and be responsible for end‑to‑end delivery.
• Design new consumer and corporate telecom solutions.
• Create and maintain technical documentation (HLDs, LLDs, WOs, etc.) throughout the solution lifecycle.
• Implement solutions in a live environment and understand end‑to‑end system testing requirements.
• Follow‑up and define quality and performance indicators.
• Perform capacity and performance analysis, reporting and define improvement solutions.
• Define and implement service and resource configuration on requested systems.
• Develop solutions that influence current product design and address design issues for future products or technologies.
• Maintain close relationships with external partners such as carriers and service providers.
• Elaborate and manage change‑request processes with partners to meet network necessities.
• Control the network elements roadmap, ensuring timely software/hardware upgrades during component lifecycle.
• Generate and implement process improvements, especially cross‑team processes.
• Document the existing technology portfolio and recommend improvements and alternatives.

Requirements

Must-haves

• Proven experience implementing live solutions on mobile telecom networks (GSM, UMTS, LTE, IMS), including network design, capacity management, engineering and architecture.
• Knowledge of 3GPP, GSMA, ITU standards and specifications.
• Experience designing, testing and operating signalling network functions (STPs, DEA/DRAs, HLR/HSS).
• Experience defining, establishing and maintaining signalling interconnects, SIGTRAN and DIAMETER‑based, using SCTP multi‑homing.
• Experience with HLR/HSS, subscriber profiles, repositories and reference interfaces.
• Knowledge of IMS architecture and its interaction with profile repositories.
• Experience in mobile services charging (online) and knowledge of Ro, Gy, Gx interfaces.
• Knowledge of signalling protocols and routing (M3UA, M2PA, DIAMETER, MAP, CAMEL, Sh, Cx).
• Knowledge of 5G SA networks, especially signalling (SCP, SEPP) and AUSF/UDM/UDR perspectives.
• Experience with protocol analyser tools (Wireshark, Astelia) to troubleshoot network errors.
• Experience with ETSI NFV architecture and solutions.
• Familiarity with MVNO/MVNE/MVNA architecture(s) and landscape.
• English proficiency mandatory; other languages advantageous.
• Degree in Telecom Engineering, Computer Science or equivalent experience.

Nice-to-haves

• Over 3 years of experience designing and implementing mobile core networks.
• Previous experience with Nokia, Oracle, HPE products.

Benefits

• CLT contract providing job stability and reliable benefits.
• Quarterly performance bonuses to reward 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 maternity leave and 20 days paternity leave.
• Daycare allowance for mothers with children under 3—R$500 per month per child.

Why 1GLOBAL?

• Growth opportunities: advance your career in a fast‑growing telecommunications company expanding over 100 % year‑on‑year.
• Major transaction exposure: be involved in transactions that shape the future telco industry.
• Work with a talented team: collaborate with senior management, founders, and external advisors.
• Dynamic work environment: thrive in a collaborative, fast‑paced workplace that encourages innovation.
• Professional development: work alongside industry experts and enhance your skills in cutting‑edge technology.
• International experience: opportunities to work in different 1GLOBAL offices worldwide.
• Open communication culture: ideas are heard and dialogue is encouraged in a supportive environment.
• Results‑driven mindset: value efficiency, creativity and impact.

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.