Network Optimization Engineer (São Paulo/Rio de Janeiro based)

Location: São Paulo or Rio de Janeiro, Brazil; the role is based in one of these locations and includes 24/7 on-call participation.

Company

hirify.global is a technology-driven global mobile communications provider offering connectivity through a telecom platform, proprietary eSIM technology, and its own mobile core network across 15 countries; it operates as a regulated telecommunications provider in 43 countries.

What you will do

• Monitor, analyze, and report on network and service KPIs, identify bottlenecks and emerging risks, and translate findings into optimization initiatives.
• Lead investigation and resolution of complex incidents, major outages, and service degradations across mobile core domains, including root cause analysis and corrective and preventive actions.
• Analyze signalling, session behavior, service flows, traffic, and network performance to improve reliability, capacity utilization, service quality, and customer experience.
• Oversee deployment, integration, testing, and operational acceptance of core network elements, features, and software upgrades.
• Develop and maintain recovery plans, troubleshooting playbooks, operational procedures, diagnostics, reports, scripts, and repeatable workflows.
• Collaborate with network, observability, operations, product, software engineering, commercial, legal and regulatory teams, and vendors on service improvements and governance.

Requirements

• Strong understanding of mobile network architectures and technologies across 2G, 3G, 4G/LTE, and 5G.
• 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.
• Ability to troubleshoot complex mobile network issues, correlate signalling and service behavior, 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, as well as 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.
• Proactive, analytical, and detail-oriented approach, with the ability to collaborate across multicultural, geographically distributed technical teams.
• 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, is required.
• Professional English proficiency and the ability to communicate technical findings and recommendations clearly.

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

• CLT employment contract with job stability and benefits.
• Quarterly performance bonuses.
• Meal allowance of R$100 per working day paid into a Caju card.
• Health insurance with SulAmérica, with 50% covered by the company.
• Extended parental leave: 180 days of maternity leave and 20 days of paternity leave.
• Daycare allowance of R$500 per month per child for mothers with children under 3 years old, plus professional development and international office opportunities.