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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Core Network Engineer II - **Company:** Core - **Location:** Madrid, Spain - **Contract:** Permanent contract - **Skills:** Packet Switching, Network Monitoring, Packet Analyzer, Systems Integration, Wireshark, Scripting, VoLTE - **Published:** July 17, 2026 - **Apply:** https://www.adzuna.es/contact-us.html ## About the Role + 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. ## Description We are looking for an energetic, enthusiastic experienced Engineer who has direct working knowledge of Core Networks to include Circuit Switching, Packet Switching, VOLTE, HLR/HSS and messaging (SMS) and is committed to their work and should be comfortable working in a fast-paced, highly flexible environment. The role will be responsible for the support and expansion of a global core network. This is a great opportunity for an engineer with strong Telecoms experience to demonstrate their technical and organisational ability, working in a small team of experienced engineers at the cutting edge of IoT technologies. In this role you will be: + 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., New hires at Cubic³ are required to work onsite five days a week during their six-month probation period to get to know the company, their team, and our ways of working. After probation, we offer a flexible arrangement of up to eight work-from-home days per month, provided it aligns with business needs and performance standards. This arrangement is not a given for all roles. Cubic³ is an equal opportunities employer and committed to fostering a diverse and inclusive workplace. 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