Network Engineer

iSAM; London; On-site; GBP 45,000 - 65,000; Full time

Job summary

A leading company in London is seeking a skilled Network Engineer to enhance network performance and reliability. The ideal candidate will design and maintain secure network infrastructures, manage network access control, and support automation efforts. The role requires strong problem-solving skills and a background in networking technologies.

Qualifications

• 4+ years of experience in network support/engineering roles.
• Strong understanding of networking fundamentals (OSI Model, TCP/IP).

Responsibilities

• Design, configure, and maintain secure and scalable network infrastructure.
• Implement and manage network access control (NAC) systems.

Skills

Network Security

Problem-Solving

Communication

Adaptability

Analytical Thinking

Education

Bachelor's degree in Computer Science

Tools

Python

Ansible

Terraform

Git

Grafana

Job description

Network Engineer

Department: Infrastructure

Employment Type: Permanent

Location: London

Reporting To: Head of Platform Engineering

Description

We are seeking a skilled Network Engineer with a strong background in Wi-Fi, switching, routing, firewall technologies, and network automation principles. The ideal candidate should possess in-depth knowledge of network protocols, network security, and automation frameworks to enhance network performance and reliability.

Key Responsibilities

• Design, configure, and maintain secure and scalable network infrastructure solutions, including firewall configurations, VPN setup, and security protocols
• Implement and manage network access control (NAC) systems to ensure secure network access for all users and wireless/wired devices
• Configure, optimize, and troubleshoot Wi-Fi networks, including access points, cloud-based controllers, and client devices
• Perform network performance monitoring, analysis, and troubleshooting for wired and wireless environments
• Perform Business as Usual (BAU) support for Network and Automation operations
• Take ownership of the end-to-end network infrastructure, from data centre cabling to the network architecture
• Continually improve our monitoring systems to pre-empt and detect failure as well as provide alerting to the organisation
• Participate in on-call rota
• Provide concise and professional documentation
• Project delivery/management collaborating with internal and external vendors
• Implement and/or coordinate changes following approved change control policies.
• Travel might be required.

Skills, Knowledge and Expertise

Required Skills & Qualifications:

• Bachelor's degree in Computer Science, Information Technology, or related field (or equivalent experience)
• 4+ years of experience in network support/engineering roles
• Strong understanding of networking fundamentals (OSI Model, TCP/IP, Switching & Routing)
• Working in multi-vendor environment, incl. Arista, Fortinet, Meraki, Zscaler
• Experience in configuring/troubleshooting Wireless networks
• Strong understanding of network access control (NAC) principles and solutions (Cisco ISE, Arista AGNI, or similar)
• Proficiency in 802.1x authentication and related security protocols (EAP, RADIUS, etc.).
• Advanced troubleshooting experience in BGP/OSPF routing in multi VRF environment
• Experience in Python scripting and automation tools (Ansible, Terraform, Jinja2, Netbox, Git, GitLab CI/CD)
• Experience with Prometheus, Alert Manager, Grafana
• Knowledge of firewall policies, IPSEC VPNs, SSL, and security best practices
• Data Centre / Colo experience
• Experience working with Linux
• Excellent problem-solving skills and attention to details
• Certifications such as CCNA, CCNP, JNCIA, or DevNet Associate are advantageous

Bonus Qualifications:

• Experience with Cloud Networking (AWS, Azure, or GCP)
• Experience with cloud-based DDoS protection solutions
• Experience in containerized networking environments (Docker, Kubernetes)
• Exposure to SDN (Software Defined Networking) and SD-WAN solutions
• Experience with overlay networks (EVPN, VxLAN)

Personal Attributes and Key Outcomes

Personal Attributes:

• Clear communication – explains technical concepts concisely and effectively

• Adaptability – adjusts to new technologies and unexpected challenges

• Analytical thinking – breaks down complex issues logically and methodically

• Decision-making – balances speed and accuracy when making technical decisions

• Collaboration over competition – prioritises team success over individual wins

• Accountability – follows through on commitments and owns mistakes

• Patience – supports teammates as they learn or troubleshoot issues

• Open to feedback – accepts and applies suggestions for improvement

• Growth mindset – always looks for ways to improve skills and workflows

• Proactiveness – takes initiative instead of waiting for instructions

Key outcomes:

Success in a Network Engineer role at iSAM isn’t just looking after networks —it’s about building relationships, problem-solving, and making a lasting impact on the team and business.

• Contributes to a positive, inclusive team culture where knowledge sharing is the norm

• Improves automation frameworks, reducing manual effort and deployment risks

• Fixes issues swiftly and documents solutions for future reference

• Takes full responsibility for automation scripts, CI/CD pipelines and IaC tools

• Recongnised by peers and leadership as a reliable resource for automation challenges

• Trusted to make informed decisions that align with team and company goals