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# Core Network Engineer II

- **Company:** Airalo
- **Location:** Madrid, Spain (Remote available)
- **Salary:** €59,600.0 - €85,600.0
- **Contract:** Permanent contract
- **Skills:** Border Gateway Protocol, Data Centers, GPRS Core Networks, Mobile Application Software, Internetwork Packet Exchange, Systems Integration, Wide Area Networks, Network Routers, Computer Network Operations, SIGTRAN, Restful APIs
- **Published:** September 26, 2026
- **Apply:** https://www.adzuna.es/contact-us.html

## About the Role

+ Technical Degree in Engineering or Telecommunications preferred or equivalent experience demonstrated
 + 3 - 5 years minimum relevant experience in the telecom core field
 + 3+ years experience with network elements such as: Packet Gateway GGSN/PGW/DPI, direct and sponsored roaming (HLR/HSS), diameter routing and GTP, GRX
 + 3+ years experience with these protocols; Sigtran: MAP (Mobile Application Protocol), Sigtran: CAP (Camel 1-3), Diameter (Ro, Gx, Gy, Gn, Gi), REST API, BGP
 + Excellent verbal and written communication skills
Bonus Points

 + IREG Testing experience is preferred
 + International working experience is ideal

## Description

+ Benefits: Learn more about our benefits here in this link - https://airalo-public.notion.site/Benefits-25396a97ffca81fb9bc1f0be479f1be3?pvs=74
 + Languages: English is our main working language day to day, so you'll need to be comfortable communicating in it both in meetings and async.
Your main responsibilities will be:

 + Designing the IP infrastructure of our multi-site data centers
 + Designing the GRX/IPX interconnectivity and global PoP structure to access mobile partner networks
 + Defining the WAN network strategy
 + Leading and realization of the data centre LAN and WAN networks, specifically the configuration of DRAs, GTPs, GGSN/PGW, SBC, FW, Routers
 + Integrating direct roaming agreements and sponsored roaming agreements
 + Tracing of signalling and user plane transport for debug issues
 + Acting as a primary interface between the Core Network team and Airalo's Platform team, Airalo's Network Operations team and technology partners (vendors, roaming partners)
 + Core network optimisation and enhancement
 + Supports the operations team in regards to:
 + Deployments and rollouts
 + Performance improvements
 + Perform trainings
 + Supporting the partner's operations team
What You'll Bring


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