Network Engineer - NSX

Job Description:

Salary Range: £44,171 - £58,000

Leonardo UK operates a grade-based salary framework with broad bands. The salary range shown reflects the approved grade band for this role, or a narrower hiring range published within that band, and is benchmarked against the external market. Exceptions above the standard range are managed through governance controls to protect internal equity.

Do you want to grow your career in network engineering and work on projects that safeguard the UK’s most critical systems? At Leonardo, our 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 the lead in solving customer problems in an agile, innovative and team‑centric manner. The role may involve a blended hybrid working model, with a mixture of working from home and working on site at one of our Leonardo offices to ensure close collaboration with the wider team and with our customers.

• Design, configure, and support network virtualisation solutions (e.g. VMware NSX) within secure and enterprise environments
• 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 and technical documentation.
• Integrate and test network components, ensuring compliance with performance and security requirements.
• Provide mentoring, guidance, and technical leadership to Network Engineers and Technicians.
• Collaborate with stakeholders, project teams, and customers to ensure solutions meet requirements.
• Drive continuous improvement and contribute to engineering standards and governance.

• Strong experience in designing, configuring, and supporting network virtualisation platforms (e.g. NSX or similar)
• Ability to balance hands‑on engineering with technical leadership and mentoring responsibilities.
• Confidence to take ownership of solutions and represent networking in technical discussions.

• Strong understanding of TCP/IP, OSI model, and routing/switching protocols (BGP, OSPF, QoS, VPNs, VLANs)
• Network virtualisation (NSX‑T): design, configuration, and support of NSX‑based networking environments
• Software‑defined networking: implementation of logical switching, routing, and micro‑segmentation
• Integration of NSX networking within virtualised and platform environments (e.g. VCF)
• Hands‑on experience with Cisco or equivalent multi‑vendor network equipment
• Network security technologies (firewalls, IDS/IPS, VPN, segmentation)
• Familiarity with virtualisation and cloud networking concepts
• Network monitoring, diagnostic, and analytics tools
• Understanding of ITIL and service management frameworks
• Delivery within secure / enterprise / defence environments

• VMware NSX‑T deep expertise and certification (or equivalent experience)
• VCF networking integration (vSphere, vSAN, Aria Suite)
• Overlay / underlay network design concepts
• Automation of network configuration (Ansible, Terraform, APIs)
• Integration with security tooling (SIEM, SOC platforms)
• Cloud networking (AWS, Azure) and hybrid connectivity
• Experience working in secure or regulated environments

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.

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. For more information and guidance please visit:

This role will be based at one of our UK sites – Yeovil.

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,…