Network Optimization Engineer (Lisbon 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 1GLOBAL expands its global customer base and service portfolio, the performance, reliability, and scalability of our mobile network are increasingly critical. As a Network Optimization Engineer, you will drive operational excellence, service assurance, and continuous improvement across our network and services, spanning multiple core network domains. Your primary focus will be detecting, investigating, and resolving network and service issues before they impact customers. You will define the monitoring strategy, performance frameworks, and operational processes needed to spot degradation, bottlenecks, and emerging risks early, and use network data and KPIs to drive rapid incident response, thorough root cause analysis, and lasting corrective actions. The Network Optimization team oversees network changes, defines service and network KPIs, builds recovery and resilience mechanisms, and ensures operational readiness across all network domains. Beyond resolving issues, the team turns operational learnings into structural improvements in network architecture, platform design, and service flows. Working closely with Network Engineering, Network Observability, Operations, Product, Software Engineering, Legal & Regulatory, and commercial teams, it serves as the focal point for service performance and reliability across 1GLOBAL.

About the Role

• Network Performance & KPI Analysis: Monitor, analyse, and report on network and service KPIs to identify bottlenecks, anomalies, and emerging risks, and translate insights into optimization initiatives that improve efficiency, reliability, capacity utilization, and customer experience. Define requirements for new KPIs, monitoring, and observability integrations to strengthen end-to-end visibility and enable proactive issue detection.
• Incident Troubleshooting & Restoration: Lead the investigation and resolution of complex incidents, major outages, and service degradations across mobile core domains, ensuring rapid restoration and minimal customer impact.
• Root Cause Analysis & Prevention: Own the root cause analysis (RCA) process, documenting findings and ensuring corrective and preventive actions are assigned, tracked, and completed.
• Mobile Core & Service Optimization: Analyse signalling, session behaviour, service flows, and network performance to identify and execute improvements in reliability, capacity, and customer experience.
• Traffic Management: Execute and validate traffic management and optimization activities during planned changes, congestion, failures, and other events to protect service performance and network stability.
• Network Changes & Operational Readiness: Oversee the deployment, integration, testing, and operational acceptance of new core network elements, features, and software upgrades, assessing their performance and resilience impact.
• Recovery & Resilience Engineering: Develop, test, and maintain recovery plans, troubleshooting playbooks, operational procedures, and best practices for efficient service restoration.
• Operational Design Feedback: Provide operational input to solution architecture and service design so that reliability, resilience, maintainability, and service quality are built in from the outset.
• Automation & Continuous Improvement: Build or improve scripts, diagnostics, reports, and repeatable workflows that accelerate detection, analysis, mitigation, and prevention of service issues.
• Process & Vendor Governance: Define, implement, and improve vendor management, service management, and operational governance processes, ensuring work is delivered on time and to agreed quality standards.
• Cross-Team Collaboration: Work with Network Engineering, Network Observability, Operations, Product, Software Engineering, and vendors to investigate service issues and implement technical improvements.
• 24/7 On-Call Support: Participate in the 24/7 on-call rotation for the defined network scope, supporting timely incident response and service restoration.

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.