Network Support Engineer - Ethernet & Optical

Colt Technology Services; Barcelona; On-site; EUR 40,000 - 70,000; Full time

Job summary

Colt Technology Services is seeking an engineer to join the network operations environment, troubleshooting Ethernet and Optical faults across our European network. You will work through Layer 1 and Layer 2, with exposure to Layer 3 services where relevant, taking ownership from diagnosis to resolution.

You will keep customers informed with clear updates, collaborate with field teams and vendors, and contribute to long-term improvements. A 24/7 shift rotation is required.

Qualifications

• Hands-on experience troubleshooting Ethernet and/or Optical network services.
• Structured fault-finding approach to identify root causes.
• Experience working with operational network services prioritising availability.
• Clear communication of technical information to customers and teams.

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, coordinating with specialist teams.
• Keep customers informed with clear, helpful updates.
• Collaborate with network partners, Field Maintenance and engineering teams to fix incidents.
• Identify recurring problems and contribute to longer-term improvements.
• Support root-cause investigations and produce technical incident reports.
• Assist planned network changes and software upgrades; participate in 24/7 shift rotation.

Skills

Ethernet networking

Optical networking

Troubleshooting

Layer 1 & 2 basics

Customer communication

Incident ownership

24/7 shift readiness

Tools

Netcool

SMARTS

InfoVista

Job description

Why we need this role

Networks don't always behave as expected. When something goes wrong, our customers rely on Colt engineers to understand what is happening, find the cause and get their services back to where they need to be. You'll join our network operations environment, working across Ethernet and Optical services and tackling a varied range of technical issues. You'll take ownership of incidents, collaborate with engineers, field teams, partners and technology vendors, and build your knowledge across a broad network environment. If you already have a strong grounding in Ethernet or Optical networking, you don't need to know every technology or vendor in our network from day one. We're looking for solid troubleshooting skills, curiosity and the ability to learn.

What you will do

• 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.

What we're looking for

You don't need experience of every technology in our network. We're particularly interested in engineers who understand how networks work, enjoy troubleshooting and can apply that knowledge to unfamiliar problems.

Must haves

• Hands-on experience troubleshooting Ethernet and/or Optical network services.
• A good working understanding of Layer 1 and Layer 2 networking.
• A structured approach to fault finding, with the ability to investigate symptoms and identify likely causes.
• Experience working with operational network services where resolving faults and maintaining availability are important.
• Confidence communicating technical information clearly with customers, engineering teams and other stakeholders.
• Ability to take responsibility for an incident and coordinate with others through to resolution.
• Spanish and English at B2 level or above, with the ability to communicate confidently about technical issues with customers, partners and engineering teams.
• Ability to participate in a 24/7 shift rotation.

Might haves

• Knowledge of Optical transmission technologies such as WDM/DWDM, TDM, MSP, ADM or DCS/DXC.
• Understanding of IP networking and Layer 3 troubleshooting.
• Experience with equipment from Nokia, Ciena, Infinera, ADVA, Cisco, Juniper or similar network vendors.
• Familiarity with monitoring and network-management platforms such as Netcool, SMARTS, InfoVista, TACACS or vendor element managers.
• Experience working with NOCs, field engineering teams, carrier partners or equipment vendors.
• Experience supporting root-cause analysis or producing technical incident reports.