Ethernet & Optical Network Troubleshooting Engineer

Colt Technology Services; Madrid; On-site; EUR 42,000 - 68,000; Full time

Job summary

Colt Technology Services in Madrid is seeking a skilled Network Engineer to troubleshoot Ethernet and Optical services with a focus on Layer 1/2. The role involves incident management, proactive fault analysis, and coordination with vendors and partners to restore services.

You will work across Layer 1 and Layer 2 technologies, with exposure to Layer 3 services where relevant, and translate technical updates for customers.

Qualifications

• Hands-on experience troubleshooting Ethernet and/or Optical network services.
• Good working understanding of Layer 1 and Layer 2 networking.
• Structured fault finding with ability to investigate symptoms and identify causes.
• Experience with operational network services where availability is critical.
• Clear communication of technical information to customers and teams.
• Ability to take responsibility for incidents and drive resolution.
• Spanish and English at B2 level or above.
• Willingness to participate in a 24/7 shift rotation.

Responsibilities

• Troubleshoot and resolve faults affecting Ethernet and Optical services across our European network.
• Work across Layer 1 and Layer 2 technologies, with exposure to Layer 3 services where relevant.
• Follow technical issues from initial diagnosis through to resolution, bringing in specialist teams or vendors when needed.
• Keep customers informed, translating complex technical issues into clear, useful updates.
• Work alongside network partners, Field Maintenance and technical teams to resolve service-affecting incidents.
• Look beyond the immediate fix by identifying recurring problems and contributing to longer-term improvements.
• Support root-cause investigations and produce clear technical reports following significant incidents.
• Contribute to planned technical activities, including network changes and software upgrades.
• Work as part of a 24/7 shift rotation supporting Colt's network and customers.

Skills

Ethernet and/or Optical network skills

Layer 1 & Layer 2 networking

Structured fault-finding approach

Operational network services

Clear customer communications

Incident ownership & coordination

Bilingual Spanish/English (B2+)

24/7 shift readiness

Job description

Colt Technology Services in Madrid is seeking a skilled Network Engineer to troubleshoot Ethernet and Optical services with a focus on Layer 1/2. The role involves incident management, proactive fault analysis, and coordination with vendors and partners to restore services.

You will work across Layer 1 and Layer 2 technologies, with exposure to Layer 3 services where relevant, and translate technical updates for customers.