Senior Network Engineer

Claranet Portugal; Lisboa; On-site; EUR 55,000 - 75,000; Full time

Job summary

Claranet Portugal is seeking a Senior Network Engineer to join the internal team in Lisbon. You will operate, configure and troubleshoot complex network fabrics, including Cisco ACI, Huawei switching, Palo Alto and Fortinet firewalls, and Azure networking services.

You will collaborate with the client ICT Squad, manage incidents, plan changes and maintain comprehensive documentation. Ideal candidates have 5+ years of enterprise networking experience, strong routing/switching knowledge, fluent

Qualifications

• 5+ years of experience in enterprise network engineering/operations.
• Hands-on experience with Cisco ACI.
• Solid experience with Huawei switching.
• Experience administering Palo Alto and Fortinet firewalls.
• Experience with Azure Networking and Security services.
• Strong routing & switching knowledge (BGP, OSPF, VLANs, STP) and VPN technologies.
• Fluent Portuguese and good English (written and spoken).
• Interpersonal relationship and teamwork.
• Proactivity, initiative and good analytical ability.

Responsibilities

• Operate, configure and troubleshoot Cisco ACI fabrics (tenants, VRFs, bridge domains, EPGs, contracts, L3Outs).
• Manage Huawei switching infrastructure (VLANs, STP, LACP, stacking, L3 routing).
• Administer Palo Alto and Fortinet firewalls—security policies, NAT, VPNs, threat prevention profiles, HA and firmware lifecycle.
• Operate and evolve Azure network components (VNets, peering, VPN Gateway/ExpressRoute, NSGs, Azure Firewall, Application Gateway/WAF, Private Endpoints).
• Act as L2/L3 escalation point for network and security incidents; perform root cause analysis and fixes.
• Plan, document and execute network changes per ITIL processes and change windows.
• Monitor network health and capacity (Zabbix/Grafana).
• Maintain up-to-date network diagrams, configurations, procedures and knowledge articles.
• Collaborate with client ICT Squad on network/security projects.

Skills

Enterprise networking

Cisco ACI

Huawei switching

Palo Alto

Fortinet

Azure Networking

Routing & Switching

VPN technologies

Portuguese

English

Teamwork

Proactivity

Analytical ability

Tools

Zabbix

Grafana

Job description

We're fast learners, hard workers, natural collaborators... and we Make Modern Happen!

Our ambition is to unlock the potential of our digital world so that organisations everywhere can innovate and thrive securely.

We aim to achieve this goal by bringing together the world’s most talented people and the most powerful technologies, combining them to address our customers' challenges and to build something stronger together.

Right now, we are looking for a Senior Network Engineer to integrate our internal team, based in Lisbon.

Your responsibilities include:

• Data Center Networking (Cisco ACI): Operate, configure and troubleshoot Cisco ACI fabrics (tenants, VRFs, bridge domains, EPGs, contracts, L3Outs), ensuring availability and performance.
• LAN/Campus Switching (Huawei): Manage the Huawei switching infrastructure (VLANs, STP, LACP, stacking, L3 routing), including configuration, firmware upgrades and troubleshooting.
• Firewall & Network Security: Administer Palo Alto and Fortinet firewalls – security policies, NAT, site-to-site and remote-access VPNs, threat prevention profiles, HA and firmware lifecycle.
• Azure Networking & Security: Operate and evolve Azure network components (VNets, peering, VPN Gateway/ExpressRoute, NSGs, Azure Firewall, Application Gateway/WAF, Private Endpoints) and hybrid connectivity with on-premises.
• Incident & Problem Management: Act as L2/L3 escalation point for network and security incidents, performing root cause analysis and implementing permanent fixes.
• Change Management: Plan, document and execute network changes in line with ITIL processes and the client's change windows.
• Monitoring & Capacity: Monitor network health and capacity (e.g. Zabbix/Grafana), proactively identifying risks and improvement opportunities.
• Documentation: Maintain up-to-date network diagrams, configurations, procedures and knowledge articles.
• Client Collaboration: Work as part of the client's ICT Squad (Network & Security), in close collaboration with the client's technology team, supporting sprint planning and network/security projects.

You must have:

• 5+ years of experience in enterprise network engineering/operations;
• Hands-on experience with Cisco ACI;
• Solid experience with Huawei switching;
• Experience administering Palo Alto and Fortinet firewalls;
• Experience with Azure Networking and Security services;
• Strong routing & switching knowledge (BGP, OSPF, VLANs, STP) and VPN technologies;
• Fluent Portuguese and good English (written and spoken);
• Interpersonal relationship and teamwork;
• Proactivity, initiative and good analytical ability.

Nice to have:

• Network/security certifications: Cisco CCNP/CCIE (Data Center or Enterprise), Palo Alto PCNSE, Fortinet NSE 4 or higher, Microsoft AZ-700,
• Hold ITIL certification,
• Experience in client-facing / onsite and Agile (squad, sprint) delivery models,
• Knowledge of monitoring tools (Zabbix, Grafana),
• Problem-solving skills,
• Good communication,
• Stress management and emotional control,