Job Description
📌 Senior Network Security Engineer
📌 Sheffield or Hatfield
📌 £58,000 to £70,000 + 10% Bonus
📌 10% Pension + Life Assurance + Excellent Benefits + Share Equity
📌 Hybrid Working | 3 On Site | 2 Remote
** The business will support the application for security clearance. Due to the nature of work, the individual has to be a UK national or have lived and worked in the UK for the past 5 consecutive years. **
The Role In a Nutshell
Act as the primary technical authority for key customer's complex network and security infrastructure. This is a unique hybrid position blending Technical Design Authority responsibilities with senior operational engineering, requiring deep networking and security expertise to drive technical improvements and lead during critical incidents.
The Business
With one of the largest networks in Europe, this business invests hundreds of millions annually in research each year and employs more than 10,000 people in the network business alone. With incredible opportunities to learn, develop and grow your skills, they will invest in you, nurture your potential and shape your future whatever your background or experience.
The Role
You'll be the dedicated technical resource for key enterprise customers leveraging the IaaS platform to deliver critical business solutions. This isn't standard ticket-based work—you'll drive technical improvements, lead projects, and engage directly with customers. The role is 60-70% technical, requiring subject matter expertise in high-pressure, customer-facing environments. You'll be the go-to expert during major incidents, providing deep technical leadership.
Skills & Experience
•\tDemonstrable, in-depth experience in networking and security
•\tStrong skills in LAN switching and routing principles
•\tProven experience with security technologies
•\tExpertise with Fortinet and Cisco highly preferred
•\tEligible for UK Security Clearance (SC)
The following would be an advantage:
•\tExperience with WAF/Load balancers
•\tDynamic routing protocols
•\tFCSS/CCNP or Fortinet Network Security certifications
•\tAgile and ITIL process knowledge
Your Responsibilities
•\tAct as lead technical authority for customer's complex infrastructure environments
•\tProactively identify and drive technical improvements, projects, and changes
•\tServe as primary technical contact during major incidents, leading resolution
•\tWork directly with customers, managing stakeholder relationships
•\tProvide technical leadership and oversight for second and third-line support engineers
•\tDevelop deep understanding of customer solutions to implement beneficial changes
Other skills required:
•\tTechnical Authority - Proven ability to articulate design and implementation of complex technical solutions with detailed examples, explaining rationale end-to-end
•\tCustomer Engagement - Exceptional communication and stakeholder engagement skills with ability to build customer rapport and trust
•\tProblem Solving - Strong analytical abilities, capable of providing deep, low-level technical analysis in pressurised environments
•\tLeadership - Confidence to lead technical discussions and mentor colleagues, providing trustworthy feedback
•\tImprovement Mindset - Proactive approach to constantly seeking opportunities to enhance service and efficiency
Benefits
•\tWorld-class training and development opportunities
•\t10% on-target bonus
•\tCompany Pension scheme
•\t25 days annual leave plus bank holidays, increasing with service
•\tHuge range of flexible benefits including cycle to work, healthcare, season ticket loan
•\tOption to join company share saving schemes
•\tEqual family leave: 18 weeks full pay, 8 weeks half pay, 26 weeks statutory rate
keywords: network security, fortinet, cisco, technical authority, customer-facing, security clearance, lan switching, routing, waf, load balancer, fcss, ccnp, infrastructure, technical leadership