Voice and Services Engineer (Lisbon Based)

About the role

1GLOBAL, a global mobile communications provider founded in 2022, is hiring a Voice and Services Engineer for its Networks & Engineering department in Lisbon. Working in a hybrid setup, you will propose, analyse and define requirements for voice systems, design and test new solutions, support the technology roadmap and take part in cross-functional projects.

Key responsibilities

• Collaborate with other Networks teams on projects for delivering new solutions, covering project delivery, network design, integration and migration strategy, and end-to-end delivery.
• Design new consumer and corporate telecom solutions and create and maintain technical documentation (HLDs, LLDs, WO's).
• Implement solutions in live environments, follow end-to-end system testing requirements, and define quality and performance indicators.
• Carry out capacity and performance analysis, reporting and improvement, and configure services and resources on requested systems.
• Manage change requests to current partners, control the network elements roadmap and plan software and hardware upgrades.
• Document the technology portfolio and propose improvements or alternatives.

Required profile

• Proven experience implementing live mobile telecom solutions (GSM, UMTS, LTE, IMS), network design, capacity management, engineering and architecture.
• Degree in Telecom Engineering, Computer Science or equivalent experience.
• English proficiency is mandatory; other languages are a plus.

Required skills

• NGN networks (MSS/MGW, HLR/HSS, SBC), voice interconnects (SIP/RTP) and IMS architecture (P/S/I-CSCF, application servers).
• Voice technologies: VoIP, VoLTE, VoWiFi, QoS, SMS routing, mobile services charging (OCS, Ro, Ro+, Ga, Bp).
• Signaling gateways and protocols: SS7, SIGTRAN, MAP, CAMEL, Diameter/SCTP.
• Protocol analyzers such as Wireshark and Astelia; ETSI NFV; MVNO/MVNE/MVNA architectures.
• Nice to have: 3+ years in telecoms, previous work with Nokia, Oracle and Ribbon IMS products.