Core Network Engineer II

Cubic³

Core Network Engineer supporting Cubic³ core network elements and troubleshooting network incidents. Collaborating with team members to enhance network monitoring capability in a hybrid setting.

Posted 5/1/2026full-timeMadrid • 🇪🇸 SpainMid-LevelSeniorWebsite

About the role

Key responsibilities & impact

Responsible for supporting the Cubic³ core network elements. Performing troubleshooting and analysis of network incidents.
Providing input and collaborating with other team members developing, implementing, integrating, and monitoring network team projects.
Expanding the network monitoring capability.
Ensuring consistent uptime of the core network.
Acting as a key point of contact for vendors and other Cubic³ teams.
Participating in knowledge transfer to and from fellow engineers.

Requirements

What you’ll need

Experience with 3GPP Network Elements: HLR/HSS, DRA, STP, SMSC, GMSC, IMS Core, PGW, OCS, PCRF, AAA
Good understanding of telecom protocols and corresponding interfaces: GTP (S8), Diameter (S6a, Gx, Gy, Rx, Cx, Sh), MAP, Radius, SMPP, SIP
Experience of implementing telecoms integrations.
Experience with Wireshark network analyser and scripting languages an advantage.
Minimum 5 years’ experience in telecoms Engineering or Degree in Computer/Telecoms Engineering.
Proven track record in working with small teams.
Demonstrated expertise in troubleshooting network issues.
Excellent documentation skills.
Desire to learn from and collaborate with peers.
Excellent spoken and written English.
Previous experience working to aggressive timelines essential.
Commitment to provide a high quality and professional service.
Ability to work unsupervised and take responsibility for the completion of tasks.
Ability to prioritise work tasks.
Adaptable and flexible in approach to work.
Effective problem-solving skills.
Availability to support out-of-hours work where required and on-call rota.

Benefits

Comp & perks

Flexible working hours
Professional development opportunities

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

3GPP Network ElementsHLRHSSDRASTPSMSCGMSCIMS CorePGWOCS

Soft Skills

team collaborationtroubleshootingdocumentationcommunicationproblem-solvingadaptabilityflexibilitytime managementresponsibilitydesire to learn

Certifications

Degree in Computer EngineeringDegree in Telecoms Engineering