# Senior Network Security Consultant at Aon

Aon is hiring a Senior Network Security Consultant in London, United Kingdom. Level rates it Little AI ●○○○; you can [apply on Aon](https://jobsbylevel.com/go/d9d1758f-adef-45d3-a724-493e3e026c70?utm_medium=ai-agent).

AI Level 1, AI centrality 38 out of 100. London, United Kingdom.

## Details

- Company: [Aon](https://jobsbylevel.com/companies/aon)
- AI level: AI Level 1 (score 38 out of 100)
- Location: London, United Kingdom
- Posted: November 5, 2026
- Apply: https://jobsbylevel.com/go/d9d1758f-adef-45d3-a724-493e3e026c70?utm_medium=ai-agent
- Free CV review for this job: https://jobsbylevel.com/cv-review?job=senior-network-security-consultant-at-aon-2be32a

## Description

We’re hiring! Aon is seeking a Senior Network Security Consultant to join our Digital M&A Advisory practice in London. The team advises private equity investors, infrastructure funds and corporate clients on technology, IT, cyber and digital risks across acquisitions, portfolio companies and strategic transformation initiatives. Our work spans cyber due diligence, technical cyber reviews, cyber risk assessments, network and infrastructure security reviews, separation and integration support, and post-transaction cyber value creation. This role is ideally suited to a technically strong network specialist with hands-on experience designing, implementing or assessing enterprise network architectures, segmentation and firewall configurations across on-premise, cloud and hybrid environments. Previous M&A experience is not required. You will act as the technical network security lead on our engagements, working directly with investors, CISOs, infrastructure and network teams and C-suite executives to assess network security posture, identify exposures and translate technical findings into clear business and investment implications. This is a fast-paced, client-facing role offering significant exposure to a broad range of industries, network environments and technologies. About Aon Headquartered in London, Aon Plc is a leading global professional services firm providing a broad range of risk, retirement and health solutions. Our 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. 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. About the Role Your impact as a Senior Network Security Consultant: You will be responsible for leading the network security elements of engagements across private equity and corporate clients, including: Leading technical network security reviews as part of cyber due diligence, technical reviews and portfolio company engagements. Assessing enterprise network architecture and design across data centres, offices, sites, cloud and hybrid environments, including WAN, LAN, SD-WAN and remote access. Reviewing network segmentation and zoning, including VLANs, VRFs, DMZs, micro-segmentation and separation of critical, production and user environments. Reviewing firewall configurations and rule bases (e.g. Palo Alto, Fortinet, Check Point, Cisco), identifying overly permissive, redundant or shadowed rules, insecure services and gaps in change control. Assessing perimeter and internet exposure, including externally facing services, VPN and remote access gateways, web application firewalls and DDoS protection. Evaluating cloud network security controls across Azure and AWS, including VNets/VPCs, security groups, NSGs, private endpoints and hybrid connectivity (ExpressRoute, Direct Connect, site-to-site VPN). Assessing IT/OT network separation and industrial network security (e.g. Purdue model, IEC 62443) where relevant. Reviewing network access control, Zero Trust Network Access (ZTNA) and SASE/SSE architectures. Assessing network monitoring, logging and detection capabilities, including NDR, IDS/IPS, NetFlow and integration with SOC/SIEM services. Reviewing the hardening, patching and lifecycle status of network devices, including end-of-life infrastructure. Translating technical findings into prioritised, commercially relevant risks, remediation roadmaps and cost estimates for investors and management teams. Producing high-quality reports, presentations and executive briefings. Managing technical workstreams and supporting engagement delivery across multiple concurrent projects. Working closely with colleagues across technology, cyber, M&A and risk advisory disciplines. Contributing to the development of the team's technical review

The description is cut here. Read the full offer: https://jobsbylevel.com/jobs/senior-network-security-consultant-at-aon-2be32a

Source: https://jobsbylevel.com/jobs/senior-network-security-consultant-at-aon-2be32a

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