Network Engineer

Inetum; Lisboa; On-site; EUR 35,000 - 55,000; Full time

Job summary

Inetum is seeking a Production Network Engineer to ensure availability, performance, and security of network infrastructures for multiple customers in a shared services setup. You will operate LAN/WAN, datacenter networks, and security components in a 24/7 production environment, handling complex incidents and implementing changes.

Ideal candidates have 3–5 years in network operations, strong troubleshooting skills, and excellent English communication.

Qualifications

• 3-5 years in network operations/run.
• Fluent in English with clear technical communication.
• Ability to prioritize, work autonomously, and perform under on-call conditions.
• Strong troubleshooting and incident management abilities.

Responsibilities

• Operations & Monitoring: Ensure LAN/WAN/WLAN and datacenter networks function properly; monitor devices and manage alerts.
• Incident Management (L2/L3): Own complex incidents, troubleshoot, and communicate progress; reduce recurring incidents with RCA.
• Changes & Projects: Prepare, validate, and implement network changes; document changes; participate in architecture evolution projects.
• On-call & Out-of-hours Support: Provide 24/7 on-call support; respond to critical incidents and maintain SLA.
• Documentation & Continuous Improvement: Maintain runbooks and contribute to automation and optimization.

Skills

Network operations

Troubleshooting

Communication

Autonomy

On-call experience

Education

None

Tools

Cisco

Juniper

Aruba

HP

Zabbix

PRTG

ServiceNow

Git

Ansible

Job description

Company Description

Inetum is a European leader in digital services. Inetum’s team of 28,000 consultants and specialists strive every day to make a digital impact for businesses, public sector entities and society. Inetum’s solutions aim at contributing to its clients’ performance and innovation as well as the common good.

Company Description

Inetum is a European leader in digital services. Inetum’s team of 28,000 consultants and specialists strive every day to make a digital impact for businesses, public sector entities and society. Inetum’s solutions aim at contributing to its clients’ performance and innovation as well as the common good.

Present in 19 countries with a dense network of sites, Inetum partners with major software publishers to meet the challenges of digital transformation with proximity and flexibility.

Driven by its ambition for growth and scale, Inetum generated sales of 2.5 billion euros in 2023.

Job Description

The Production Network Engineer is responsible for ensuring the availability, performance, and security of the network infrastructures of multiple customers within a shared services team. The Network Engineer operates and maintains LAN/WAN, datacenter and security components in a 24/7 production environment, handles complex incidents (L2/L3), and implements changes and upgrades.

Responsibilities

• Operations & Monitoring: Ensure proper functioning of LAN/WAN/WLAN, datacenter networks, and customer interconnections. Monitor network devices (switches, routers, firewalls, VPN, proxies, load balancers) and manage alerts through diagnosis, prioritization, resolution, or escalation.
• Incident Management (L2/L3): Take ownership of complex incidents, perform advanced troubleshooting (logs, packet captures, traces), and communicate progress to internal teams and customers. Contribute to reducing recurring incidents through preventive actions and root cause analysis.
• Changes & Projects: Prepare, validate, and implement network changes (upgrades, migrations, patching). Produce change documentation and participate in architecture evolution projects. Execute high-impact interventions, often outside regular business hours.
• On-call & Out-of-hours Support: Provide 24/7 on-call support according to the rotation, respond to critical incidents, and ensure service continuity and SLA compliance.
• Documentation & Continuous Improvement: Maintain technical documentation and runbooks, support knowledge sharing, and contribute to process improvement, automation, standardization, and infrastructure optimization for performance, resilience, and security.

Qualifications

Experience & Core Skills

• 3-5 years of hands-on experience in network operations/run.
• Strong troubleshooting abilities and clear communication (written & verbal).
• Fluent in English; comfortable with technical English.
• Able to prioritize, work autonomously, and perform under on-call conditions.

Technical Skills

• IP Networking: Solid knowledge of TCP/IP, VLANs, routing (OSPF, BGP, EIGRP), switching (STP, RSTP, VXLAN), QoS, HSRP/VRRP, link aggregation.
• Infrastructure: Experience with Cisco, Juniper, Aruba, HP; WAN (MPLS, IPsec VPN, SD-WAN); enterprise Wi-Fi environments.
• Security: Firewalls (ASA/FTD, Palo Alto, Fortinet, Check Point), VPNs, proxies; concepts like segmentation, DMZ, NAC, bastion hosts.
• Tools: Monitoring tools (Zabbix, PRTG), ticketing (ServiceNow), config management (Git, Ansible).
• Systems: Good understanding of Linux/Windows servers and core services (DNS, DHCP, NTP). Knowledge of datacenter/virtualization (VMware, Nutanix, hypervisors, F5/Citrix load balancers).
• Nice to Have: Layer 7 e Zscaller.

Soft Skills

• Rigorous, responsible, reliable—especially in production and on-call environments.
• Strong analytical thinking; remains calm and reactive during crises.
• Team-oriented mindset in multi-customer environments.
• Organized, autonomous, and able to manage priorities effectively.
• Customer-focused with respect for SLAs and deadlines