Network Optimization Engineer (Telecom)

Location: Lisbon, Portugal; Lisbon based; participation in a 24/7 on-call rotation is required.

Company

hirify.global is a global mobile communications provider operating a regulated telecommunications platform, proprietary eSIM technology, and its own mobile core network across 15 countries.

What you will do

• Monitor and analyse network and service KPIs, identify bottlenecks, anomalies, degradation, and optimization opportunities, and define requirements for monitoring and observability integrations.
• Lead troubleshooting and restoration for complex incidents, major outages, and service degradations across mobile core domains.
• Own root cause analysis, corrective and preventive actions, recovery plans, troubleshooting playbooks, and operational procedures.
• Optimize signalling, session behaviour, service flows, traffic management, network capacity, reliability, and customer experience.
• Oversee deployment, integration, testing, and operational acceptance of new core network elements, features, and software upgrades.
• Build scripts, diagnostics, reports, and repeatable workflows while collaborating with engineering, observability, operations, product, software, vendors, legal and regulatory, and commercial teams.

Requirements

• Strong understanding of mobile network architectures and technologies across 2G, 3G, 4G/LTE, and 5G domains.
• Experience with MVNO architectures and ecosystems, including roaming environments and their technical, commercial, and regulatory considerations.
• Strong networking fundamentals, protocol and security knowledge, and hands-on experience with SIGTRAN, Diameter, SCTP, and GTP.
• Hands-on experience with MAP, CAMEL, and SIP, plus solid understanding of LTE, 5G, IMS, VoLTE, VoWiFi, and IP-based services.
• Demonstrated ability to troubleshoot complex mobile network issues, correlate signalling and service behaviour, identify root causes, and implement sustainable fixes.
• Ability to interpret network metrics and KPIs, correlate performance across multiple domains, and identify degradation and optimization opportunities.
• Familiarity with mobile network monitoring, observability, and performance management tools.
• Experience with cloud-native solutions, virtualization technologies, and modern telecom infrastructure platforms.
• Experience using scripts, automation, and data-driven approaches to improve network operations and diagnostic workflows.
• Relevant professional experience in the design, implementation, optimization, or operation of mobile core network services; a degree in Telecommunications Engineering, Computer Science, or a related field, or equivalent practical experience.
• Proactive, analytical, and detail-oriented approach, ability to collaborate across multicultural and geographically distributed technical teams, and professional English proficiency with clear technical communication.

Nice to have

• Familiarity with ITIL, service management practices, and operational excellence frameworks.
• Experience collaborating with product, engineering, operations, and commercial stakeholders on service improvement initiatives.
• Experience with large-scale multi-domain performance analysis, proactive issue detection, and preventive network optimization initiatives.

Culture & Benefits

• Career growth in a rapidly expanding telecommunications technology company.
• Collaborative, fast-paced, international, and innovation-focused work environment.
• Professional development alongside industry experts.
• Opportunities to work in different hirify.global offices around the world.
• Open communication, supportive dialogue, and a results-driven culture.