At a Glance
- Tasks: Engineer and support resilient, secure network infrastructure across various environments.
- Company: Join a diverse tech company that values innovation and collaboration.
- Benefits: Flexible hours, remote work options, mentorship, and educational opportunities.
- Other info: Inclusive culture that celebrates diversity and encourages personal growth.
- Why this job: Make a real impact on global network solutions using cutting-edge technologies.
- Qualifications: Hands-on experience with Cisco networking and strong troubleshooting skills required.
The predicted salary is between 60000 - 80000 £ per year.
We are seeking an IT Infrastructure Engineer (Network) to contribute to the engineering, implementation, support, and optimisation of enterprise network services, supporting office, data centre, and hybrid cloud networking environments. This is a hands‑on engineering role focused on delivering resilient, secure‑by‑design, and high‑performance network platforms using predominantly Cisco technologies, with exposure to Juniper and cloud‑native networking. The role will be critical in ensuring network segmentation, security, and scalability across the organisation’s global infrastructure. The role requires solid technical capability, strong troubleshooting skills, and effective collaboration across teams.
What you will do
- Engineer and support network infrastructure, including:
- Office / campus networks
- Data centre networking
- Hybrid cloud connectivity (Azure, GCP)
- Implement, support and input to the design of secure, scalable network solutions across:
- LAN / WAN / Data Centre / Cloud
- Support and optimise Cisco-based network platforms, including:
- Routing and switching
- Cisco ACI (Application Centric Infrastructure)
- Policy-driven segmentation
- Support and manage F5 load balancing platforms, including:
- LTM configuration and optimisation
- Traffic management and application delivery
- High availability and failover design
- Deliver secure‑by‑design network architecture, including:
- Network segmentation and micro‑segmentation
- Zero Trust principles
- Alignment to enterprise security controls
- Implement, support and input to the design of hybrid networking solutions, including:
- Connectivity to Azure and GCP
- VPN and private connectivity models (e.g. ExpressRoute, Interconnect)
- Troubleshoot and resolve complex network incidents and performance issues across multi‑layer environments.
- Contribute to network automation and standardisation to improve operational efficiency.
- Produce and maintain high‑quality network documentation, including:
- High‑level and low‑level designs
- Network diagrams
- Runbooks and operational procedures
- Configuration standards
- Collaborate with:
- Security teams (segmentation, network security controls)
- Cloud engineering teams
- Platform and infrastructure teams
- Participate in the on‑call rota to support critical network incidents.
What we are looking for
- Required skills & experience
- Good hands‑on experience with:
- Cisco networking technologies (core requirement)
- Data centre networking and Cisco ACI
- F5 load balancing platforms
- Experience with:
- Juniper networking technologies (desirable)
- Hybrid cloud networking (Azure and/or GCP)
- Strong knowledge of:
- Network segmentation and secure network design
- Routing and switching protocols (e.g. BGP, OSPF)
- Layer 4–7 load balancing concepts
- High availability and resilient design
- Proven ability to implement, support and contribute to the support of enterprise‑scale network environments.
- Good troubleshooting experience across:
- LAN
- WAN
- Ability to implement complex technical delivery and provide strong contributions to problem resolution.
- Strong understanding of:
- Secure‑by‑design networking
- High availability, resilience, and fault tolerance
- Hands‑on experience implementing and operating Cisco ACI environments.
- Ability to contribute to design decisions in partnership with architecture teams.
- Preferred qualifications
- Certifications such as:
- F5 certifications
- Cloud networking certifications (Azure / GCP)
- Exposure to:
- Container networking and modern application delivery
- Degree in Computer Science, Networking, or related field (or equivalent experience)
- 3-5 years of experience in enterprise networking
- Flexible working hours and the option to work from home.
- Extensive induction program with experienced mentors and buddies.
- Opportunities for further development and educational opportunities.
- Global Family Leave Policy.
- Employee Assistance Program.
- Internal inclusion & diversity employee networks.
Education & Experience
What we offer you
Diversity and inclusion
Inclusion and valuing diversity of thought and experience are at the heart of our culture here at Colt. From day one, you’ll be encouraged to be yourself because we believe that’s what helps our people to thrive. We welcome people with diverse backgrounds and experiences, regardless of their gender identity or expression, sexual orientation, race, religion, disability, neurodiversity, age, marital status, pregnancy status, or place of birth.
IT infrastructure engineer (network) in London employer: Colt Technology Services Group Ltd.
At Colt, we pride ourselves on being an exceptional employer, offering a dynamic work culture that fosters collaboration and innovation. As an IT Infrastructure Engineer (Network), you will benefit from flexible working hours, extensive mentorship programs, and numerous opportunities for professional development, all while contributing to cutting-edge network solutions in a diverse and inclusive environment. Join us to be part of a team that values your unique contributions and supports your growth in the ever-evolving tech landscape.
Contact Details:
Colt Technology Services Group Ltd. Recruitment Team
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We think this is how you could land IT infrastructure engineer (network) in London
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We think you need these skills to ace IT infrastructure engineer (network) in London
Some tips for your application 🫡
Showcase Your Problem-Solving Skills:In IT consulting, it's all about problem-solving, so make sure your CV highlights your analytical skills and any relevant projects you've tackled. Mention specific technologies or methodologies you've used to resolve issues or improve processes; this shows you can think critically and deliver results, which is vital for us at Colt Technology Services Group Ltd..
Highlight Relevant Certifications:Certifications like ITIL, PMP, or even specific tech stack qualifications can really make you stand out. Make sure to include these in your CV, as they not only demonstrate your expertise but also your commitment to staying current in the field. We love seeing candidates who are proactive about their professional development!
Tailor Your Cover Letter:Your cover letter is your chance to connect personally with us at Colt Technology Services Group Ltd.. Share stories about your experiences in IT consulting, and how they shaped your desire to join our team. Mention why you’re excited about this particular role, and how you see yourself contributing to our projects.
Keep It Clear and Concise:We're all busy, so make sure your application is easy to read. Use bullet points for key achievements, and don’t overload us with jargon. A clean, professional layout goes a long way. Remember, the clearer your application, the more likely we are to invite you in for an interview!
How to prepare for a job interview at Colt Technology Services Group Ltd.
✨Brush Up on Your Technical Skills
For an IT consulting role, be ready to demonstrate your technical prowess. You might face questions on systems integration, cloud technologies, or even troubleshooting specific software. If you have experience with tools like AWS, Azure, or even specific programming languages, make sure you can talk about them fluently.
✨Showcase Your Problem-Solving Approach
IT consulting is all about solving problems for clients. Think about how you can illustrate your approach to a past challenge using the STAR method (Situation, Task, Action, Result). It's a great way to show how you tackle complex issues and come up with effective solutions.
✨Know the Business Impact of IT Solutions
When discussing your experiences, focus not just on the tech solutions you implemented, but also on their business impact. Employers want to see that you can connect IT with organisational goals. Prep examples that highlight how your tech contributions improved efficiency or reduced costs for past clients or projects.
✨Prepare for Behavioural Questions
Since IT consulting often involves teamwork and client interactions, expect behavioural questions that assess your interpersonal skills. Be prepared with examples that demonstrate your adaptability, communication skills, and how you handle client feedback. Before the interview, think of situations where you worked closely with clients to create effective IT strategies or changes.
