Senior Network and Security Engineer in London

About The Role

Own complex networks. Lead delivery on site. Be the expert customers trust as our Senior Network and Security Engineer. At Intercity, we don’t just keep networks running, we make them secure, resilient and fit for the future. We’re looking for a Senior Network & Security Engineer to take a leading technical role supporting a key customer site in Nuneaton. This is a hands‐on, customer‐facing role for an experienced engineer who enjoys ownership, problem‐solving and delivering real outcomes.

You’ll work across BAU support and project delivery, acting as a trusted technical presence on site and a go‐to escalation point for complex network challenges.

About the role

This is a second‐line and project‐focused role, combining technical depth with strong customer engagement. You’ll be responsible for troubleshooting and resolving complex network issues, delivering network projects end‐to‐end, and ensuring the customer’s environment remains secure, stable and well‐documented. You’ll operate with confidence and autonomy, knowing when to take the lead and when to collaborate with senior colleagues and you’ll play a key role in guiding and mentoring a more junior engineer on site. This role is based primarily at a customer site in Nuneaton and requires someone who is comfortable being visible, accountable and trusted by stakeholders.

Key responsibilities as a Senior Network and Security Engineer:

• Act as a technical escalation point for complex network and security incidents
• Troubleshoot and resolve network issues while managing priorities and SLAs
• Deliver network projects end‐to‐end, from design through to implementation, commissioning and UAT
• Configure, deploy and support enterprise network infrastructure, including: Juniper switching, routing and firewalls, Aruba wireless controllers and access points
• Lead wireless deployment, optimisation and troubleshooting
• Own patching, upgrades and configuration changes across the estate
• Maintain clear, accurate network documentation and live ticket updates
• Build strong working relationships with customer stakeholders through clear, confident communication
• Mentor and guide a junior engineer, supporting their technical development
• Work independently on site while collaborating with wider Intercity delivery teams

Key Experience

This role is suited to an experienced network engineer who is confident working in a customer environment and comfortable owning complex technical delivery. You’ll bring:

• Strong, hands‐on experience in enterprise networking, with at least 2+ years in a dedicated networking role
• Proven experience working with Juniper and Aruba technologies
• The ability to diagnose and resolve complex network issues under pressure
• Experience delivering technical projects alongside BAU support
• Excellent verbal and written communication skills
• A structured, methodical approach to troubleshooting and documentation
• Confidence working independently while contributing as part of a wider team
• A proactive mindset and a genuine interest in continuous learning

Qualifications

JNCIA, ACNT or a relevant degree (or equivalent practical experience)

What We Offer:

• 33 days holiday (inclusive of bank holidays), with entitlement increasing by one day for each full calendar year employed, up to a maximum of five days.
• Annual pay reviews.
• Holiday buy scheme.
• All‐company bonus scheme.
• Death in service cover.
• Employee assistance programme.
• Company pension.
• Active social calendar.
• A strong focus on developing our people.

About Us

Intercity Technology provides reliable and secure technologies in communications, cloud, and managed services, with a big difference - Intercity is a technology solutions partner that isn’t all about tech. It’s about a great bunch of people combining their passion, expertise, and dedication to deliver extraordinary results for businesses.

Our vision is to be the best technology partner to work for and with - we are really proud of our achievements so far: Customer Net Promoter Score of +92, Gold Award Investors in People Accreditation, Employer of the Year 2025 - British Business Excellence Award, Gold Eco Vadis rating - Among the Top 3% of Companies for Sustainability Performance.

We select candidates with the right skills, experience, and values to join us and selection is based on a fair and equal process. We’re proud to be committed to equal opportunities and welcome all applications. As a specialist in secure technology solutions, all successful candidates will be subject to pre‐employment checks, so we can ensure compliance with our ISO27001 (Information Security) and Cyber Essentials Plus certifications. We are committed to using any personal information you may give us in a secure and proper manner, for more information please see our privacy policy on our website.