Lead Infrastructure Engineer

Are you ready to lead the design and deployment of secure, enterprise‑grade networking platforms? We’re looking for a Lead Infrastructure Engineer – Networking to join our Aerospace, Defence and Security Sector (ADS) team in Hemel Hempstead. This is a full‑time, on‑site role with occasional travel to client sites. You must hold active DV clearance to be considered.

You’ll be part of a collaborative, delivery‑focused team that thrives on precision and structure. Work together to solve complex challenges, share knowledge, and deliver robust, secure systems that meet critical national security requirements. You’ll have direct influence on project delivery as a subject‑matter expert in networking, applying strict governance and security principles throughout.

• Designing and deploying multi‑site enterprise hardware platforms using COTS networking.
• Creating data centre layouts, rack configurations and cabling schematics.
• Specifying and managing hardware components across the delivery lifecycle.
• Documenting low‑level designs, procedures and disaster recovery instructions.
• Acting as the go‑to expert for hardware and data centre‑related matters.
• Supporting hardware implementation and integration within secure environments.

• Active DV Clearance.
• Strong hands‑on experience managing and configuring network platforms.
• Expertise in fault‑tolerant networking solutions.
• Solid understanding of enterprise hardware installation and resilient design principles.
• Proficiency in networking across multi‑technology solutions.
• Knowledge of networking in Windows Server/Client and virtual environments.

• Cisco certifications.
• Experience with infrastructure automation tools such as Ansible and Terraform.
• Understanding of data centre power and cooling requirements.
• Familiarity with secure environments and regulations (JSP 440, JSP 604, SCIDA).
• Experience with monitoring tools like SCOM and Splunk Enterprise.

If you’re interested in this role but not sure if your skills and experience are exactly what we’re looking for, please do apply – we’d love to hear from you.

Employment Type: Full‑time, Permanent.

Location: Hemel Hempstead.

Security Clearance Level: DV (Developed Vetting).

Internal Recruiter: Soraya.

Salary: £60,000 to £75,000.

Benefits: £5,400 car allowance, 25 days annual leave with the option to buy additional days, private medical, life assurance, pension, and generous flexible benefits fund.

Although this role is advertised as full‑time, we believe that flexibility at work can promote work/life balance, increase your motivation, reduce stress and improve performance and productivity. We support different ways of working and can offer a range of flexible working arrangements. So, if you’re interested and need to work flexibly, we encourage you to apply and talk to us about what might be possible.

We embrace difference as a source of creativity, innovation and competitive advantage and are striving to become a more diverse organisation. We welcome applications from people with a diverse variety of backgrounds and identities. We are committed to equality of opportunity for all and do not discriminate on the basis of race, religion, colour, gender, age, disability, sexual orientation or marital status.

We have partnered with Vercida, the UK’s largest diversity and inclusion focused careers site, where all our vacancies are available in an accessible format.

If you require any adjustments to the recruitment process, to enable you to perform to the best of your ability, please let us know when completing your application. We participate in the Disability Confident scheme and are committed to offering an interview to any candidate with a disability, who meets the minimum criteria for the role. If you believe this could apply to you, please let us know when completing your application.