Site Security Manager (London)

About Nebius: Nebius is leading a new era in cloud infrastructure for the global AI economy. We are building a full-stack AI cloud platform that supports developers and enterprises from data and model training through to production deployment, without the cost and complexity of building large in-house AI/ML infrastructure. Built by engineers, for engineers. From large-scale GPU orchestration to inference optimization, we own the hard problems across compute, storage, networking and applied AI. Listed on Nasdaq (NBIS) and headquartered in Amsterdam, we have a global footprint with R&D hubs across Europe, the UK, North America and Israel. Our team of 1,500+ includes hundreds of engineers with deep expertise across hardware, software and AI R&D.

The role: Nebius is looking for a Site Security Manager to lead physical security operations for the Nebius London office. You will own the day-to-day security posture of the site, protect employees, visitors, assets and infrastructure, and make sure local practices are robust, compliant and aligned with Nebius corporate standards. This is a hands-on leadership role for someone who can set clear processes, manage vendors and front-desk security personnel, and respond calmly and decisively when incidents occur.

Your responsibilities will include:

• Lead day-to-day physical security operations at the Nebius London office, maintaining a safe, secure and professional environment for employees, visitors and company assets.
• Develop, implement and continuously improve site-specific security policies, procedures and training for the London office, aligned with Nebius corporate standards and applicable UK regulatory requirements.
• Monitor and manage CCTV, alarm systems and access-control processes, ensuring reliable operation, clear escalation routes and timely response to potential threats.
• Conduct regular risk assessments, site reviews and physical-security checks; identify vulnerabilities and drive corrective actions to completion.
• Serve as the primary local liaison with UK law enforcement, emergency services, building management and other relevant authorities during incidents, emergencies or crises.
• Lead investigations into security breaches and incidents, document findings clearly, and implement corrective and preventive actions.
• Manage relationships with external security vendors and contractors, setting expectations and ensuring high-quality service delivery.
• Direct, brief and coach front-desk security personnel on-site so that security standards are applied consistently and professionally.
• Partner with Facilities, IT, People, Legal/Compliance and site leadership to keep local practices aligned with company-wide security, safety and business-continuity expectations.

We expect you to have:

• Proven experience managing physical security operations, preferably in large corporate, technology, critical-infrastructure or governmental environments.
• Strong leadership, communication and interpersonal skills, with the ability to manage vendors, contractors and diverse on-site teams.
• Solid knowledge of physical-security principles, risk management, emergency response and applicable UK regulatory requirements.
• Hands-on experience with security technologies, including surveillance systems, CCTV, alarm systems and access-control platforms.
• Excellent analytical and problem-solving ability, with the judgment to assess risk, prioritize remediation and implement effective solutions.
• Calm, credible decision-making under pressure, especially during emergencies, incidents or sensitive investigations.
• Clear documentation and reporting skills, including incident reports, risk summaries, findings and corrective-action plans.
• Good communication skills in English.

Benefits & Perks:

• Competitive compensation
• Career growth and learning opportunities
• Flexibility and ownership
• Collaborative and innovative culture
• Opportunity to work on impactful AI projects
• International environment and talented teams

What's it like to work at Nebius: Fast moving - Bold thinking - Constant growth - Meaningful impact - Trust and real ownership - Opportunity to shape the future of AI.

Equal Opportunity Statement: Nebius is an equal opportunity employer. We are committed to fostering an inclusive and diverse workplace and to providing equal employment opportunities in all aspects of employment. We do not discriminate on the basis of race, color, religion, sex (including pregnancy), national origin, ancestry, age, disability, genetic information, marital status, veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by applicable law. Applicants must be authorized to work in the country in which they apply and will be required to provide proof of employment eligibility as a condition of hire. If you need accommodations during the application process, please let us know.