At a Glance
- Tasks: Manage and enhance enterprise firewall infrastructure while leading automation initiatives.
- Company: Join a dynamic team focused on cutting-edge network security solutions.
- Benefits: Competitive pay, flexible working options, and opportunities for professional growth.
- Other info: Collaborative environment with a focus on innovation and career advancement.
- Why this job: Be at the forefront of network security and make a significant impact in a vital role.
- Qualifications: 5-7 years in network security with strong FortiGate experience required.
The predicted salary is between 60000 - 80000 £ per year.
We are seeking an experienced Senior Firewall & Network Security Engineer with deep expertise in the Fortinet ecosystem to join our infrastructure security team. In this role, you will design, manage, and continuously improve enterprise‑grade firewall infrastructure, lead firmware upgrade cycles, drive automation initiatives, and serve as the subject‑matter expert on FortiGate platforms — including the 1500D and 1800F series. You will work cross‑functionally with network, cloud, and compliance teams, operating within ITIL‑aligned change management processes.
Key responsibilities
- Own end‑to‑end management of enterprise FortiGate firewalls (1000‑series and above) across production and non‑production environments, including VDOM configuration, HA setup, and policy routing.
- Plan and execute FortiOS major‑version upgrade paths (e.g., 6.x → 7.x) in production, including firmware validation, compatibility matrix review, pre/post checklists, and rollback procedures.
- Lead hardware migration and refresh projects for Fortinet infrastructure — from staging through production cutover — with full documentation and stakeholder communication.
- Administer and tune the FortiGate 1800F platform, leveraging the NP7 network processor architecture for high‑performance traffic inspection and security policy enforcement.
- Manage the Fortinet centralised management stack: FortiManager (policy and configuration management), FortiAnalyzer (logging and reporting), and FortiClient EMS (endpoint visibility).
- Develop and maintain network automation workflows using Ansible, Python, or the Fortinet REST API to reduce manual toil and enforce configuration consistency.
- Author change requests, risk assessments, and runbooks aligned to ITIL practices, managing approvals and execution through ServiceNow or Jira.
- Perform advanced CLI‑level troubleshooting and debug command analysis to resolve complex network and security incidents within SLA.
- Collaborate with security operations and architecture teams to continuously harden firewall policies, reduce attack surface, and meet compliance requirements.
Required experience
- 5–7 years in firewall engineering, network security operations, or infrastructure security roles.
- Demonstrated experience managing FortiGate firewalls in enterprise environments (1000‑series or higher strongly preferred).
- Proven track record executing at least one large‑scale Fortinet hardware migration or refresh project.
- Working knowledge of ITIL practices, change management, and ticketing platforms (ServiceNow, Jira).
Preferred qualifications
- Fortinet NSE 4, NSE 7, or NSE 8 certification.
- Experience with the FortiGate 1800F hardware platform and NP7 processor architecture.
- Proficiency in Python or Ansible for network automation at scale.
- Exposure to SD‑WAN, zero‑trust segmentation, or cloud security gateway architectures.
- Familiarity with multi‑VDOM designs in large enterprise or service provider environments.
Senior Network Security Engineer in London employer: Bounteous
Join a forward-thinking company in London that values innovation and expertise, particularly in the realm of network security. As a Senior Firewall & Network Security Engineer, you will thrive in a collaborative work culture that encourages professional growth through challenging projects and continuous learning opportunities. With a focus on cutting-edge technology and a commitment to employee development, this role offers a unique chance to make a significant impact while enjoying a supportive environment.
StudySmarter Expert Advice🤫
We think this is how you could land Senior Network Security Engineer in London
✨Network Like a Pro
Get out there and connect with folks in the industry! Attend meetups, webinars, or even local tech events. The more people you know, the better your chances of landing that Senior Network Security Engineer role.
✨Show Off Your Skills
Don’t just list your qualifications; demonstrate them! Create a portfolio showcasing your projects, especially those involving FortiGate firewalls or automation with Python. This will make you stand out when we’re looking for that perfect fit.
✨Ace the Interview
Prepare for technical interviews by brushing up on your CLI troubleshooting skills and understanding of ITIL practices. We love candidates who can think on their feet and solve problems in real-time, so practice common scenarios you might face.
✨Apply Through Our Website
Make sure to apply directly through our website! It’s the best way to ensure your application gets seen by the right people. Plus, it shows us you’re genuinely interested in joining our team.
We think you need these skills to ace Senior Network Security Engineer in London
Some tips for your application 🫡
Tailor Your CV:Make sure your CV highlights your experience with Fortinet firewalls and any relevant projects you've led. We want to see how your skills match the job description, so don’t be shy about showcasing your expertise!
Craft a Compelling Cover Letter:Your cover letter is your chance to shine! Use it to explain why you’re the perfect fit for our Senior Firewall & Network Security Engineer role. Share specific examples of your past work that align with the responsibilities listed in the job description.
Show Off Your Certifications:If you’ve got any Fortinet certifications like NSE 4, NSE 7, or NSE 8, make sure they’re front and centre in your application. We love seeing candidates who are committed to their professional development!
Apply Through Our Website:We encourage you to apply directly through our website. It’s the best way for us to receive your application and ensures you’re considered for the role. Plus, it’s super easy!
How to prepare for a job interview at Bounteous
✨Know Your Fortinet Stuff
Make sure you brush up on your knowledge of the Fortinet ecosystem, especially the FortiGate 1500D and 1800F series. Be ready to discuss your hands-on experience with these platforms, including any major upgrades or migrations you've led.
✨Showcase Your Automation Skills
Since automation is key in this role, prepare to talk about your experience with Ansible or Python. Have specific examples ready where you've developed workflows to reduce manual tasks and improve efficiency.
✨Understand ITIL Practices
Familiarise yourself with ITIL-aligned change management processes. Be prepared to explain how you've applied these practices in your previous roles, particularly in managing change requests and using tools like ServiceNow or Jira.
✨Prepare for Technical Challenges
Expect some technical questions or scenarios during the interview. Brush up on advanced CLI troubleshooting and be ready to demonstrate your problem-solving skills with real-world examples of complex network incidents you've resolved.
