Job Description

Location: London, United Kingdom

Date Posted: Jan 19, 2026

Description

Security Engineering Specialist (MS Defender stack and Mimecast admin), London, Hybrid

About Alvarez & Marsal

Alvarez & Marsal (A&M) is a global consulting firm with over 10,000 entrepreneurial, action and results-oriented professionals in over 40 countries. We take a hands-on approach to solving our clients' problems and assisting them in reaching their potential. Our culture celebrates independent thinkers and doers who positively impact our clients and shape our industry. The collaborative environment and engaging work--guided by A&M's core values of Integrity, Quality, Objectivity, Fun, Personal Reward, and Inclusive Diversity--are why our people love working at A&M.

The Team

With the growth of the business globally we are now looking to further expand our Global Security Office and are looking to recruit a Security Engineer to join the team. This role requires a Security Engineer who will work as a part of the Global Security Office (GSO) reporting to the GSO Security Engineering Manager.

The successful candidate in this role

will have served as a subject matter expert

in the

Microsoft Defender stack and Mimecast platform

. You are currently a Subject Matter Expert and the primary Security Administrator, with hand-on involvement in the platform's architecture. We are not looking for SOC Analysts.

The Role

Be responsible for day-to-day administration of numerous security platforms which the SecEng and SOC uses. Contribute to the technical design of security systems and services to meet organizational needs whilst managing risks. Assist the GRC with regular vendor assessments and risk reviews. Work closely with Project Management/Change Control to deliver new solutions and ongoing system upgrades/enhancements. Research and apply innovative security solutions to new or existing problems and be able to justify and communicate design decisions. Support and collaborate with other security teams (SOC & GRC) towards a unified vision. Perform vendor assessments and risk reviews.

Core Qualifications

Bachelor's degree in a security related field is highly preferred (i.e. Security Analysis, Penetration Testing, Malware Analysis, Digital Forensics, Network Engineering, Computer Science). Have strong technical knowledge across various Security Engineering pillars (Email Security, Endpoint Security, Network Security, Cloud Security and Infrastructure Security). A number of years' direct experience in Security Engineering

(managing and administering security policy and platforms)

. Extremely advantageous: Google SecOps (SIEM), Grey Matter, Varonis and ServiceNow (SecOps); able to integrate signals and automate workflows. Email Security (

Mimecast Email security gateways, Microsoft Defender for Office 355

, DMARC/DKIM/SPF). Excellent knowledge of Microsoft Cloud Security (CASB, MFA, Azure, ATP, Intune, O365, SSO, IaaS, PaaS, SaaS). Good knowledge of Network and Endpoint Security (Cisco Firewalls/IDS/IPS, Cisco ISE, Darktrace, EDR and VPN solutions). Knowledge of scripting languages is considered highly advantageous (e.g. Python, Bash scripting). Able to participate in complex vendor troubleshooting calls and diagnose/resolve tool and policy issues.

Personal Competencies

Understand the impact of decisions, balancing requirements and deciding between approaches. Have a deep and evolving level of technical expertise. Work extremely well with minimal supervision and is a fast learner. Have great teamwork skills. Be able to cooperate with Security Engineers and in different regions. Communicate effectively with the business. Develop a variety of runbooks and training materials to ensure skill transfer within the SecEng team. Adjusting to priorities or processes as needs dictate. Have an ability to complete assigned tasks within set deadlines. Well experienced in working with external vendors and third parties. Good understanding of system and network hardening practices.

Your journey at A&M

We recognize that our people are the driving force behind our success, which is why we prioritize an employee experience that fosters each person's unique professional and personal development. Our robust performance development process promotes continuous learning, rewards your contributions, and fosters a culture of meritocracy. With top-notch training and on-the-job learning opportunities, you can acquire new skills and advance your career.

We prioritize your well-being, providing benefits and resources to support you on your personal journey. Our people consistently highlight the growth opportunities, our unique, entrepreneurial culture, and the fun we have together as their favorite aspects of working at A&M. The possibilities are endless for high-performing and passionate professionals.

Inclusive Diversity

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A&M's entrepreneurial culture celebrates independent thinkers and doers who can positively impact our clients and shape our industry. The collaborative environment and engaging work--guided by A&M's core values of Integrity, Quality, Objectivity, Fun, Personal Reward, and Inclusive Diversity--are the main reasons our people love working at A&M. Inclusive Diversity means we embrace diversity, and we foster inclusiveness, encouraging everyone to bring their whole self to work each day. It runs through how we recruit, develop employees, conduct business, support clients, and partner with vendors. It is the A&M way.

Equal Opportunity Employer

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It is Alvarez & Marsal's practice to provide and promote equal opportunity in employment, compensation, and other terms and conditions of employment without discrimination because of race, color, creed, religion, national origin, ancestry, citizenship status, sex or gender, gender identity or gender expression (including transgender status), sexual orientation, marital status, military service and veteran status, physical or mental disability, family medical history, genetic information or other protected medical condition, political affiliation, or any other characteristic protected by and in accordance with applicable laws. .

Unsolicited Resumes from Third-Party Recruiters

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Please note that as per A&M policy, we do not accept unsolicited resumes from third-party recruiters unless such recruiters are engaged to provide candidates for a specified opening. Any employment agency, person or entity that submits an unsolicited resume does so with the understanding that A&M will have the right to hire that applicant at its discretion without any fee owed to the submitting employment agency, person or entity.