Senior Network Security Engineer

Square One Resources; Coventry; On-site; GBP 73,000 - 95,000; Part time

Job summary

Square One Resources is seeking a Senior Network Security Engineer in Coventry for a 4-month contract. The role focuses on designing, implementing, and maintaining robust security across on-prem, cloud, and hybrid environments, driving Zero Trust initiatives and modernising security architecture.

You will bring hands-on firewall expertise (Palo Alto, Check Point, Cisco Firepower, Fortinet FortiGate, Juniper SRX) and strong cloud networking knowledge in Azure and AWS, with a track record of

Qualifications

• Extensive experience in enterprise network security engineering.
• Hands-on experience with enterprise firewall platforms.
• Knowledge of security in Azure and AWS networking.
• Experience designing Zero Trust security architectures.
• Ability to lead security initiatives and collaborate with SOC.

Responsibilities

• Design, implement and maintain enterprise network security across on-prem, cloud and hybrid environments.
• Lead network security transformation and Zero Trust initiatives.
• Deploy and manage firewalls with policy config, NAT, and access controls.
• Develop network segmentation strategies to minimise risk and lateral movement.
• Secure cloud network architectures in Azure and AWS and ensure secure connectivity.
• Configure VPNs, IPSec, SSL VPNs and remote access with robust security.
• Monitor security events and contribute to threat detection and response with SOC.

Skills

Network security engineering

Zero Trust

Security architecture

Threat detection

Education

Industry certifications (PCNSE, CCSE/CCSM, CISSP)

Cloud security knowledge

Tools

Palo Alto

Check Point

Cisco Firepower

Fortinet FortiGate

Juniper SRX

Job description

Job Advert: Senior Network Security Engineer

Location: Coventry - 3 days per week on-site

Rate: £455 per day (Inside IR35)

Contract: Contract opportunity

Duration: 4 months

Overview

We are seeking an experienced Senior Network Security Engineer to join a high-performing team, responsible for designing, implementing and maintaining robust enterprise network security solutions across on-premises, cloud and hybrid environments.

This is an excellent opportunity for a seasoned network security professional to take a leading role in strengthening security architecture, driving network security transformation and implementing Zero Trust principles across complex enterprise infrastructure.

The successful candidate will bring extensive hands‑on experience with enterprise firewall technologies, cloud network security, network segmentation and secure remote access, alongside the ability to lead technical initiatives and protect critical production environments against evolving cyber threats.

Key Responsibilities

• Design, implement and maintain enterprise network security solutions across global, on-premises, cloud and hybrid environments.
• Lead network security transformation, modernisation and Zero Trust initiatives.
• Design, deploy and manage enterprise firewall platforms, including policy configuration, NAT rules, access controls and rule optimisation.
• Develop and implement network segmentation and micro‑segmentation strategies to minimise security risks and lateral movement.
• Design and secure cloud network architectures across Microsoft Azure and AWS.
• Implement and manage secure connectivity between cloud platforms and on‑premises infrastructure.
• Configure and maintain VPNs, IPSec connectivity, SSL VPNs and secure remote access solutions.
• Monitor network security events, investigate incidents and collaborate with SOC teams to improve threat detection and response.
• Conduct vulnerability assessments, security architecture reviews and remediation activities.
• Ensure network security controls align with relevant policies, industry standards and regulatory requirements.
• Produce technical architecture designs, security assessments, operational documentation and remediation plans.
• Work closely with internal stakeholders, vendors and project teams to deliver secure, resilient network solutions.

Essential Skills and Experience

• Extensive experience in Network Security Engineering.
• Extensive hands‑on experience managing enterprise firewall technologies.
• Strong knowledge of Palo Alto, Check Point, Cisco Firepower, Fortinet FortiGate and/or Juniper SRX.
• Proven experience designing and implementing network segmentation and Zero Trust security solutions.
• Strong understanding of Microsoft Azure and AWS networking and security services.
• Experience with hybrid cloud connectivity, secure network architecture and cloud‑native security controls.
• Solid knowledge of VPN technologies, IDS/IPS, Web Application Firewalls, DDoS protection and secure remote access.
• Strong networking fundamentals, including BGP, OSPF, MPLS, VLANs and high‑availability architectures.
• Experience with security monitoring tools such as Microsoft Sentinel, Splunk, QRadar, Cortex XDR, CrowdStrike or Darktrace.
• Knowledge of vulnerability management, security risk assessments and compliance frameworks.
• Familiarity with automation and infrastructure‑as‑code tools such as PowerShell, Python, Terraform and Ansible.
• Excellent troubleshooting, analytical, communication and stakeholder management skills.

Desirable Experience

• Hands‑on experience with Azure Firewall, Network Security Groups, Application Gateway, Virtual WAN, ExpressRoute and Private Endpoints.
• Experience with AWS Security Groups, Network ACLs, Transit Gateway, AWS Network Firewall, WAF, Shield, Direct Connect and Amazon VPC.
• Knowledge of Zero Trust Network Access (ZTNA), Software Defined Perimeter (SDP) and Secure Access Service Edge (SASE) architectures.
• Experience working in regulated enterprise environments, particularly financial services, banking, insurance, healthcare, telecommunications, utilities or the public sector.
• Relevant industry certifications, such as PCNSE, Check Point CCSE/CCSM, Cisco CCNP/CCIE Security, Fortinet certifications, CISSP, CISM, Microsoft AZ-500 or AWS Certified Security - Specialty.
• Familiarity with ISO 27001, NIST Cybersecurity Framework, CIS Controls, GDPR and Cyber Essentials Plus.

What You'll Bring

You will be a technically strong and proactive security engineer who can operate confidently in complex enterprise environments. You will have the ability to troubleshoot challenging network security issues, influence technical decisions, engage effectively with stakeholders and deliver practical security improvements while maintaining operational resilience.

A strong background in enterprise firewall management, cloud security and Zero Trust networking will be key to success in this role