3 days ago
Lisbon, PortugalMid Level
Responsibilities
- Design, develop, test, and deploy voice and IMS service logic on Telecom Application Server and Service Creation Environment platforms.
- Define network designs, integration and migration strategies, system-testing requirements, and end-to-end delivery plans for voice and application-server solutions.
- Develop consumer and corporate voice and telecom solutions using SIP, CAMEL, Diameter, and related interfaces.
- Implement solutions in live environments and configure services and resources across relevant systems.
- Create and maintain HLDs, LLDs, work orders, technical documentation, and technology-portfolio records.
- Define and track quality and performance indicators, perform capacity and performance analysis, and develop improvement solutions.
- Collaborate with Network Engineering teams, internal departments, carriers, service providers, and external partners.
- Manage partner change requests and own software and hardware upgrade planning across network-element lifecycles.
- Contribute to product and technology design, roadmap evolution, and cross-team process improvements.
Requirements
- Proven experience implementing live solutions in GSM, UMTS, LTE, and IMS mobile telecom networks, including network design, capacity management, engineering, and architecture.
- Knowledge of 3GPP, GSMA, and ITU standards and specifications.
- Hands-on experience developing and deploying voice and IMS service logic on Telecom Application Server or Service Creation Environment platforms using SIP and CAMEL.
- Working knowledge of Java and JAIN SLEE, or an equivalent service-logic programming and execution model, for building, customizing, and troubleshooting telecom service applications.
- Experience with IMS-based unified communications, VoIP, VoLTE, VoWiFi, QoS, SMS configuration and routing, IMS nodes, and IMS protocol interfaces.
- Experience with mobile-service charging, including offline and online charging and OCS, Ro, Ro+, Ga, and Bp interfaces.
- Knowledge of Diameter and SCTP networks and protocols, plus SS7, SIGTRAN, MAP, and CAMEL signaling.
- Experience using protocol analyzers such as Wireshark or Astellia to troubleshoot telecom network issues.
- Experience with ETSI NFV architecture and solutions and familiarity with MVNO, MVNE, and MVNA architectures.
- English proficiency is mandatory; additional languages are a plus.
- Degree in Telecommunications Engineering, Computer Science, or equivalent experience.
- Preferred qualifications include 3+ years designing and implementing mobile core networks, Rhino/JAIN SLEE experience, and experience with Kamailio or FreeSWITCH.
Benefits
- Hybrid, full-time work arrangement based in Lisbon.
- Career growth opportunities in a rapidly expanding telecommunications technology company.
- Exposure to major transactions and the broader future of the telecom industry.
- Professional development alongside industry experts and access to international office opportunities.
- Collaborative, dynamic, international, and open-communication work environment.
- Equal-opportunity workplace focused on diversity, innovation, and employee contribution.
About 1GLOBAL
1GLOBAL provides eSIM-based mobile connectivity and an owned global core network for enterprises, consumers, and IoT device makers, sold via subscriptions and wholesale/MVNO services. The privately held company operates as a regulated telecom provider across 40 countries, including MVNO operations in 12 markets, and offers APIs to embed mobile service into brands and apps. Founded in 2022 by Hakan Koç and Pyrros Koussios, it is headquartered in Amsterdam.