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About the Role
The Digital M&A Advisory practice advises clients on technology, IT, cyber, and digital risks across acquisitions and strategic initiatives. This role serves as the technical network security lead, assessing network security posture and translating technical findings into business implications for investors and executives.
Responsibilities
- Lead technical network security reviews for cyber due diligence, technical reviews, and portfolio company engagements.
- Assess enterprise network architecture and design across data centres, offices, sites, cloud, and hybrid environments, including WAN, LAN, SD-WAN, and remote access.
- Review network segmentation and zoning, including VLANs, VRFs, DMZs, micro-segmentation, and separation of critical, production, and user environments.
- Review firewall configurations and rule bases (e.g., Palo Alto, Fortinet, Check Point, Cisco), identifying issues and gaps.
- Assess perimeter and internet exposure, including externally facing services, VPN, remote access gateways, web application firewalls, and DDoS protection.
- Evaluate cloud network security controls across Azure and AWS, including VNets/VPCs, security groups, NSGs, private endpoints, and hybrid connectivity.
- Assess IT/OT network separation and industrial network security where relevant.
- Review network access control, Zero Trust Network Access (ZTNA), and SASE/SSE architectures.
- Assess network monitoring, logging, and detection capabilities, including NDR, IDS/IPS, NetFlow, and integration with SOC/SIEM services.
- Review the hardening, patching, and lifecycle status of network devices.
- Translate technical findings into prioritized, commercially relevant risks, remediation roadmaps, and cost estimates.
- Produce high-quality reports, presentations, and executive briefings.
- Manage technical workstreams and support engagement delivery across multiple concurrent projects.
- Work closely with colleagues across technology, cyber, M&A, and risk advisory disciplines.
- Contribute to the development of the team's technical review methodologies, network assessment tooling, and market offerings.
- Support client engagements across the UK and EMEA.
Requirements
- Demonstrable experience in network engineering, network security, network architecture, security consulting, or a related technical role.
- Strong, hands-on experience implementing and assessing network segmentation and firewall configurations in complex enterprise environments.
- Experience designing, implementing, or assessing network segmentation and zoning (VLANs, VRFs, DMZs, micro-segmentation).
- Experience designing, implementing, or assessing next-generation firewalls and rule base management (Palo Alto, Fortinet, Check Point, Cisco).
- Experience designing, implementing, or assessing routing and switching (e.g., BGP, OSPF) and enterprise LAN/WAN/SD-WAN.
- Experience designing, implementing, or assessing VPN, remote access, ZTNA, and SASE/SSE solutions.
- Experience designing, implementing, or assessing cloud networking and security in Azure and/or AWS.
- Experience designing, implementing, or assessing network access control (802.1X, NAC).
- Experience designing, implementing, or assessing IDS/IPS, NDR, and network monitoring.
- Experience designing, implementing, or assessing wireless network security.
- Experience designing, implementing, or assessing OT and industrial network security.
- Experience designing, implementing, or assessing network resilience, redundancy, and disaster recovery.
- Familiarity with CIS Benchmarks and CIS Critical Security Controls.
- Familiarity with NIST CSF and NIST SP 800-41 (firewall guidance).
- Familiarity with NIST SP 800-207 (Zero Trust Architecture).
- Familiarity with ISO 27001.
- Familiarity with IEC 62443 and the Purdue model.
- Understanding of common network attack techniques and their impact on critical business assets.
- Ability to interpret firewall rule bases, device configurations, network diagrams, and outputs.
- Experience identifying and assessing network and cyber risks within complex environments.
- Ability to communicate technical findings and business implications to both technical and non-technical stakeholders.
- Strong analytical and problem-solving skills.
- Commercial awareness and the ability to understand business implications of technology and security decisions.
- Excellent written and verbal communication skills.
- Experience managing technical workstreams and contributing to successful project delivery.
- Strong stakeholder management and presentation skills.
- Ability to engage effectively with both technical teams and senior business executives.
- Experience developing positive client relationships.
- Comfortable working within multidisciplinary and global teams and fast-paced consulting environments.
- Ability to manage multiple engagements and competing priorities.
- Highly organised with strong attention to detail and quality.
- Experience in OT/ICS environments (highly desirable).
- Exposure to attack path analysis, exposure management, or cyber risk quantification platforms (highly desirable).
- Experience of network penetration testing, firewall audits, or security assurance reviews (highly desirable).
- Experience supporting network separations, integrations, data centre migrations, or infrastructure modernisation programmes (highly desirable).
- Experience working with private equity-backed businesses or large corporate organisations (highly desirable).
- Experience mentoring junior team members or supporting team development initiatives (highly desirable).
- Interest in supporting client relationship management (highly desirable).
Skills
- Network Engineering
- Network Security
- Network Architecture
- Security Consulting
- Network Segmentation
- Firewall Configuration
- WAN
- LAN
- SD-WAN
- Remote Access
- VLANs
- VRFs
- DMZs
- Micro-segmentation
- Palo Alto
- Fortinet
- Check Point
- Cisco
- BGP
- OSPF
- ZTNA
- SASE/SSE
- Azure Networking
- AWS Networking
- Network Access Control
- 802.1X
- NAC
- IDS/IPS
- NDR
- NetFlow
- SOC/SIEM Integration
- Wireless Network Security
- OT Network Security
- Industrial Network Security
- Purdue Model
- IEC 62443
- Network Resilience
- Disaster Recovery
- CIS Benchmarks
- CIS Critical Security Controls
- NIST CSF
- NIST SP 800-41
- NIST SP 800-207
- ISO 27001
- Network Attack Techniques
- Stakeholder Management
- Client Relationship Management
- Project Delivery
- Team Leadership
- Mentoring
Location
- London
Work Type
- Full-time
Experience Level
- Senior
Education Level
- Bachelor's degree or equivalent experience
About the Company
- Headquartered in London, Aon Plc is a leading global professional services firm providing a broad range of risk, retirement, and health solutions.
- Aon's 50,000 colleagues in 120 countries empower results for clients by using proprietary data and analytics to deliver insights that reduce volatility and improve performance.
Equal Opportunity
- Aon is an equal opportunities employer.
- Aon's recruitment and selection policy ensures the best possible skill mix of colleagues and the highest quality candidates are appointed using objective job-related criteria.