BUUK Infrastructure
Principal Network Engineer
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Job Location: Cardiff
Additional Location Information:
Salary: Competitive
Contract type: Permanent
Posting End Date: 09/09/2026
At BUUK Infrastructure, our vision is to be the leading utility partner to accelerate the UK towards net zero for all our customers. Our group of companies has been the major drive for change and innovation over 30 years.
We provide a supportive environment that is committed to enabling our people to be the best – ensuring they feel proud to be themselves and part of BUUK Infrastructure.
We are looking for a Principal Network Engineer who would like to help us reach our mission to “earn customer loyalty and drive business growth by providing consistently excellent service”.
Purpose of this Role
As our Principal Network Engineer, you will be providing subject matter engineering expertise for OFNL’s fully fibre network components, with a specific focus on Nokia core routing and Nokia and Adtran access technologies. You will be responsible for the full lifecycle of active network components, ensuring solutions are delivered at pace in a scalable, supportable, and secure manner.
You will be responsible for developing and designing the active end-to-end network, ensuring high availability and maximum performance.
Your Key Responsibilities Are
- Lead the development of new broadband, data, and voice products.
- Design scalable network solutions to support growth and ensure high availability.
- Test, evaluate, and deploy new network hardware and software.
- Maintain and create documentation, including technical reports and training materials.
- Collaborate with internal and external suppliers.
- Investigate and resolve complex technical issues, including occasional site visits.
- Develop and deliver training material and knowledge transfer activities.
- Provide technical leadership and mentorship to developing engineers.
- Act as the primary technical escalation point for network issues.
- Plan and prioritize work effectively.
- Lead development projects and introduce new technologies.
- Work closely with operational teams.
- Work with minimal supervision and support.
- Take leadership in problem investigation.
- Be a self-starter, creative, and critical thinker with coding skills.
- Supervise developing team members and act as the technical contact point for daily issues.
- Stay updated with relevant technologies and attend training courses.
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Qualifications
- Degree in telecommunications or computer science, or equivalent experience.
- Extensive experience in Network Engineering roles.
Experience/Knowledge
- Proficiency in routing and switching technologies.
- Extensive experience with IP, Ethernet, and GPON networking technologies.
- In-depth knowledge of the OSI Layer 7 model.
- Proficiency in IP, TCP, UDP, PPPoE, OSPF, BGP, SNMP, DHCP, VRRP, 802.11g/n/ac, Ethernet.
- Expertise in MPLS, t-LDP, RSVP-TE.
Abilities/Skills
- Excellent written and verbal communication skills.
- To be thorough and pay attention to detail.
- The ability to work well with others leading a focus group when needed.
- Ability to work independently.
- To be flexible and open to change.
- The ability to accept feedback and work well under pressure.
Desirable
- Nokia SRA.
- Experience with GPON/FTTH technology, experience in a telecom environment, knowledge of SIP.
- Incident Management.
- Nokia SRoS/NSP/NFMP and coding skills (especially php and velocity script).
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What Can You Expect From Us
- Cost of living annual pay review.
- Company pension contributions up to 10% if employees contribute 5%.
- 33 days holiday including bank holidays with the ability to purchase an additional 2 weeks.
- Enhanced maternity, paternity and adoption pay.
- To say thank you, each time you successfully refer someone you will receive a referral payment of £1000 (net of tax).
- Hybrid working for eligible roles.
- Development opportunities to reach your career aspirations.
BUUK has an award-winning culture. We care about your wellbeing and safety as we all deserve the right to go home safe, every day. We are proud to be an equal opportunity employer, we respect each other and advocate for equity, diversity and inclusion in all we do.
Research shows that women and people from different underrepresented backgrounds often only apply for a job if they meet 100% of the listed qualifications. If you would like to be a part of our team and you meet many, but not all our requirements for this role, please apply. You can also ask us about flexible working options.
Please note we reserve the right to close the role early. Therefore, if you're interested in this role, we encourage you to apply as soon as possible.
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