Senior Network Engineer in London

Your impact

Do you want to grow your career in networking, take on complex technical challenges, and help shape secure networks that underpin the UK’s most critical missions? At Leonardo, our Senior Network Engineers are at the heart of designing, configuring, and supporting secure networks that keep our customers connected and protected.

Your work at Leonardo UK will see you take a leading role in solving customer problems in an agile, innovative, and team-centric manner, working fully onsite at a customer location to ensure close collaboration with the wider team and our customers.

Leonardo UK is seeking a Senior Network Engineer to join the Cyber & Security Solutions Division team. This role is focused on:

What you will do as a Senior Network Engineer

• Lead the design, configuration, implementation, and support of secure networks within a secure, on-premise environment.
• Provide 1st, 2nd, and 3rd line support on premise and at deployed sites as part of a small team supporting a limited number of high-value users.
• Be willing to flex across roles where needed, supporting colleagues and contributing to the wider team’s objectives.
• Take ownership of engineering delivery for one or more work packages, including planning, estimation, execution, and reporting.
• Develop and review high- and low-level network designs, implementation plans, and technical documentation.
• Integrate, test, and support network components, ensuring compliance with performance and security requirements.
• Provide guidance and technical support to other engineers and technicians within the team.
• Collaborate with stakeholders, project teams, and customers to ensure solutions meet operational and technical requirements.
• Contribute to continuous improvement, engineering standards, and governance activities.

What you’ll bring

• Strong technical ability with demonstrable experience of delivering and supporting secure network solutions.
• Experience working onsite in secure environments.
• Adaptability and willingness to support a range of operational tasks, not solely project-based engineering activity.

Core areas (must have):

• Strong understanding of TCP/IP, OSI model, and routing/switching protocols (BGP, OSPF, HSRP, QoS, VPNs, VLANs).
• Hands-on experience with Cisco (CCNA/ CCNP level) or equivalent multi-vendor equipment (Dell, Palo Alto, Fortinet).
• Ability to provide 1st, 2nd, and 3rd line support in a secure operational environment.
• Experience with network security technologies (firewalls, IDS/IPS, VPN, NAC).
• Experience designing, configuring, and supporting networks within secure on-premise environments.
• Experience with network monitoring, diagnostic, and support tools.
• Understanding of ITIL and service management frameworks.

Desirable:

• CCNA/At least one Cisco CCNP module or equivalent certification/experience (2-4 years).
• Knowledge of software-defined networking (SDN, SD-WAN).
• Familiarity with scripting and automation (Python, Ansible, Terraform).
• Exposure to SIEMs and wider cyber security toolsets.
• Familiarity with MODCert and associated compliance processes.
• Experience with SolarWinds for monitoring and infrastructure visibility.
• Experience with enterprise IT services (Active Directory, DNS, PKI, monitoring).
• Experience mentoring engineers and contributing to technical governance.

This is not an exhaustive list, and we are keen to hear from you even if you might not have experience in all the above. The most important skill is a good attitude and willingness to learn.

Security Clearance

This role is subject to pre-employment screening in line with the UK Government’s Baseline Personnel Security Standard (BPSS). An additional range of Personnel Security Controls referred to as National Security Vetting (NSV) will apply. This role requires Developed Vetting (DV) clearance prior to starting.

Location

This role is fully site-based, 5 days per week, at a secure customer site in London. No hybrid or remote working.

Why join us

At Leonardo, our people are at the heart of everything we do. We offer a comprehensive, company-funded benefits package that supports your wellbeing, career development, and work–life balance. Whether you're looking to grow professionally, care for your health, or plan for the future, we’re here to help you thrive.

• Time to Recharge: Enjoy generous leave with the opportunity to accrue up to 12 additional flexi-days each year.
• Secure your Future: Benefit from our award-winning pension scheme with up to 15% employer contribution.
• Your Wellbeing Matters: Free access to mental health support, financial advice, and employee-led networks championing inclusion and diversity.
• Rewarding Performance: All employees at management level and below are eligible for our bonus scheme.
• Never Stop Learning: Free access to 4,000+ online courses via Coursera and LinkedIn Learning.
• Refer a friend: Receive a financial reward through our referral programme.
• Tailored Perks: Spend up to £500 annually on flexible benefits including private healthcare, dental, family cover, tech & lifestyle discounts, gym memberships and more.
• Flexible working: Flexible hours with hybrid working options. For part time opportunities, please talk to us about what might be possible for this role.

For a full list of our company benefits please visit our website.

Leonardo is a global leader in Aerospace, Defence, and Security. Headquartered in Italy, we employ over 53,000 people worldwide including 8,500 across 9 sites in the UK. Our employees are not just part of a team—they are key contributors to shaping innovation, advancing technology, and enhancing global safety.

At Leonardo we are committed to building an inclusive, accessible, and welcoming workplace. We believe that a diverse workforce sparks creativity, drives innovation, and leads to better outcomes for our people and our customers. If you have any accessibility requirements to support you during the recruitment process, just let us know.

Be part of something bigger - apply now!

Primary Location: GB - London

Contract Type: Employee-Permanent

Hybrid Working: Onsite