Network and Security Engineer

LocationLondon, England, United Kingdom

Posted At6/10/2025

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Description

Job Title: Network and Security Engineer Location: London (UK) On site Job Type: Full Time We are seeking a talented and experienced Network and Security Engineer to join our team. The ideal candidate will have a strong background in networking and security, excellent problem-solving skills, and a passion for learning and developing new skills. You will be responsible for designing, implementing, and managing networks and security measures to safeguard our networks and systems against current and emerging cyber threats, with a particular focus on Datacentre, 3GPP mobile network CORE and RAN environments. Key Responsibilities: Networking, Segmentation, Optimization and Maintenance

Design, configure and implement highly scalable L2/L3 networks using varieties of protocols and vendor equipment.
Monitor network traffic and analyse security incidents to detect and respond to threats within mobile network environments.
Diagnose and troubleshoot network related issues associated with L1-L7 using varieties of tools, ensuring quick recovery and minimum network downtime.
Carry out periodic backups of network device operating system and configurations to ensure timely restoration of critical network services.
Design and implement network security solutions such as Policies, IPS, SSLVPN, IPSec VPN and security profiles using Next-Gen Firewalls (FortiGate/Palo-Alto)
Develop and apply network segmentation strategies to strengthen security and safeguard sensitive information within the core network.
Work closely with other teams to establish and enforce network access policies, ensuring that only authorized individuals and devices have the correct access privileges.

Proactive Security Testing and Vulnerability Management

Conduct vulnerability assessments and penetration testing to identify and address security weaknesses in mobile network architectures.

Develop and enforce security policies and procedures to ensure compliance with industry standards and regulations.

Design and implement security protocols and solutions to protect network infrastructure

Develop and enforce security policies and procedures to ensure compliance with industry standards and regulations.

Work together with system administrators and application owners to resolve discovered vulnerabilities by applying necessary patches or making configuration adjustments.

Create and sustain a thorough vulnerability management program that includes tracking vulnerabilities, assessing risks, and planning remediation strategies.

Engage in network security incident response efforts by providing technical expertise and supporting investigations when needed.

Stay updated with the latest security trends, threats, and technologies, particularly related to 3GPP standards and mobile networks.

Collaborate with IT and engineering teams to integrate security measures into network architecture, including mobile network elements.

Respond to security breaches and provide incident response and disaster recovery support.

Qualifications/Skills:

Bachelor’s degree in computer science, Information Security, or a related field (or equivalent work experience).
Master’s degree in Cybersecurity or Networking is desirable.
Proven experience as a Network and Security Engineer or similar role, with focus on IP network design, implementation, T-shoot and mobile network security.
Understanding of 3GPP mobile network CORE and RAN architectures and security requirements.
Strong knowledge of network security protocols, VPN, firewall management, and intrusion detection systems.
Experience with security tools such as SIEM, IDS/IPS, and vulnerability scanners.
Familiarity with regulatory standards and frameworks (e.g., GDPR, HIPAA, ISO 27001).

In-depth understanding of routers, switches, firewalls, and switching/routing protocols – such as VLAN, VTP, STP, RSTP, MST, OSPF, EIGRP and BGP.

Monitoring solutions which include PRTG, SolarWinds and Zabbix, and also, knowledge of Virtualization technology such as EXSi, KVM, Proxmox and Hyper-V.

Relevant industry certifications such as CCNA, CCNP, CISSP, CISM, CEH, CompTIA Security+, AZ500 and GCP PCSE are highly desirable.

Excellent analytical and problem-solving skills with the ability to troubleshoot complex issues.

Strong communication skills and the ability to work effectively in a team environment.

This role requires daily physical/ onsite reporting in the office.