Share this Job

Senior Packet Core Engineer

Date: 22-Jul-2021

Location: SLOUGH, GB

Company: Telefonica S.A.


It matters to us that Team O2 is as diverse as the communities we serve. 

We’re aware that we need more diversity in our senior leadership roles, so we welcome and encourage people from all backgrounds to apply. 

Whoever you are, O2 has a place for you. 

Come join us.


Location - Slough


About the Team:


To protect the revenue and brand name of O2UK by providing 3rd Line Technical Support and 24 hour call out on a rota basis for Packet Core 2G/3G/4G network including MME/SGSN, GGSN, SPGW, ePDG and IP MPLS Network (PE’s ,P routers,RRs and other WAN technologies).



Your Role:


Work in a small team to provide third line support for the infrastructure and applications detailed above. Provide On call Support 24*7 on a rota basis (1 in 4-5 weeks) and Helpdesk Support for BAU cases from 1st/2nd line during the day - on a planned rota basis.

Work alongside a team of engineers where necessary to fix faults that are raised against the supported elements, networks or applications.

Drive through the resolution within the agreed SLA, following the escalation process where needed.




  • The main role and our purpose in operations is to protect the customer experience. We do this by ensuring we understand the network topology and the engage with and support our design colleagues to provide us with adequate redundancy.
  • We use tried and tested methods to isolate, work around or mitigate failures in the network to ensure the customer never has a bad experience connecting or using our data services.
  • We use in-house skills to develop scripts where we feel these help in keeping the network stable and protected.
  • We constantly strive to improve our monitoring tools, teams and methods.
  • As the last point of escalation before we engage our vendors – it is our role to ensure those around us, 1st and 2nd line teams and all our other operations colleagues find us approachable, competent and effective.
  • We do whatever it takes to protect our customers experience whilst maintaining a ‘can do’ attitude and challenge where we feel appropriate.



Skills & experience:


  • Cisco CCNP or CCIP or equivalent experience
  • Juniper JNCIA or equivalent experience
  • Packet core (MME/GGSN/EPG) knowledge)
  • Virtualised Infrastructure understanding
  • Understanding of DNS and how it used in Packet and IP Core infrastructures.
  • Experience of actively supporting an IP LAN and WAN network in an enterprise/production environment
  • Experience of analysing and troubleshooting service, application and network performance issues for business critical systems
  • Ability to troubleshoot Packet call flows
  • Work under pressure and provide clear and concise instructions and timely reports on any service disruptions.
  • Aid restoration of the service and management escalations as and when necessary
  • The candidate needs to have a grasp of telecommunication systems from an end to end perspective
  • Act as the Principle single point of contact from operations and as the operational consultant for any projects undertaken
  • Leading and coordinating teams of engineers whilst working on faults or projects as and when necessary


Additional Information


Closing Date: 3rd August 2021

Location: Flexible 

Grade: PTG


We’ll be sending you emails about the status of your application. To make sure you receive these, please add and to your Safe Senders list.

We’re looking to pay a great compensation package (depending on experience) for this position. We also offer plenty of extras to sweeten the deal, which could include things like bonuses, life assurance cover, health care and lots of flexible benefits.  

Also, every employee has their personal development supported with a LinkedIn learning account; plus other role specific learning available through our award-winning digital learning platform - O2 Campus. 

We also believe a great work-life balance is important, so we’re open to considering flexible working arrangements. Like to know more, feel free to raise it.  

Join us and we’ll encourage you to be bold every day. So take a deep breath, your career is about to go to exciting new places. 

If you have any questions around the role then please email who will be happy to help.