Mergers and Acquisitions Security Architect

Aon Corporation•Berwyn, IL

About The Position

Aon is in the business of better decisions. At Aon, we shape decisions for the better to protect and enrich the lives of people around the world! As an organization, we are united through trust as one inclusive, diverse team, and we are passionate about helping our colleagues and clients succeed. What the day will look like The M&A Security Architect has responsibility for end‑to‑end cybersecurity due diligence, risk quantification, and security integration/separation architecture for mergers, acquisitions, divestitures, joint ventures, and strategic partnerships. This role partners with Corporate Development, Legal, IT, Privacy, Compliance, Security Architecture and Engineering, Cybersecurity Operations, and Integrated Risk Management to: Perform deep technical assessments of target environments Identify and quantify material cyber risks and control gaps Define desired and transitional security architectures Lead implementation of security controls aligned with Aon standards from the initial phase through the first month and up to the 100-day mark The person in this role will be the primary technical authority for security across the deal lifecycle from initial diligence through integration or separation stabilization.

Requirements

5 or more years of hands‑on expertise using security technologies within a mid to large size company.
Strong risk‑based, pragmatic decision‑making
Systems thinking and ability to make architecture trade‑offs under time and information constraints
Ability to influence and negotiate outcomes across organizations without direct authority
Comfort operating in ambiguity with incomplete data and high sensitivity of information
Bias toward automation, standardization, and building reusable patterns

Nice To Haves

Experience in Technology mergers and acquisitions/integrations is a plus.

Responsibilities

Lead end‑to‑end technical security assessments across identity, network, endpoint, cloud/SaaS, data, and application security
Identify material risks
Review security evidence and artifacts
Assess security maturity against internal standards and leading frameworks
Produce executive‑ready risk summaries, findings, and recommendations (including go/no‑go guidance and conditional close criteria)
Translate technical findings into business and financial risk, including potential incident impact, operational disruption, regulatory/legal exposure, and reputational risk
Support Contracting, Legal, and Corporate Development with security requirements for TSAs and separations
Provide input on security and privacy clauses, minimum control baselines, representations and warranties, and remediation commitments
Estimate remediation effort, cost, and time, and feed these into valuation models, risk reserves, and integration budgets
Design target and interim security architectures across identity and access, network, endpoint, email/collaboration, cloud, logging/monitoring, and vulnerability/patch management
Define secure integration and separation patterns for connectivity, identity consolidation/trust, tenant/organization alignment, and logging/SIEM/SOAR coverage
Develop Day 1 / Day 30 / Day 100+ roadmaps that prioritize high‑impact controls and clearly distinguish pre‑close, Day 1‑ready, and post‑Day 1 activities
Map controls to enterprise security standards and document gaps, exceptions, and compensating controls during transition

Benefits

Aon offers a comprehensive package of benefits for full-time and regular part-time colleagues, including, but not limited to: a 401(k) savings plan with employer contributions; an employee stock purchase plan; consideration for long-term incentive awards at Aon’s discretion; medical, dental and vision insurance, various types of leaves of absence, paid time off, including 12 paid holidays throughout the calendar year, 15 days of paid vacation per year, paid sick leave as provided under state and local paid sick leave laws, short-term disability and optional long-term disability, health savings account, health care and dependent care reimbursement accounts, employee and dependent life insurance and supplemental life and AD&D insurance; optional personal insurance policies, adoption assistance, tuition assistance, commuter benefits, and an employee assistance program that includes free counseling sessions. Eligibility for benefits is governed by the applicable plan documents and policies.

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