London Security Engineer Business Operations

There’s a better way to work in finance—and more specifically, a better way to unlock value potential in private equity-backed portfolio companies. Working at the intersection of sponsors and management teams across every stage of the investment lifecycle, our team provides hands-on, execution-oriented support to elevate the office of the CFO.

So, what does it mean to work at Accordion? It means joining 1,400+ finance & technology experts in a high-growth, collaborative, and agile environment while changing the way portfolio companies drive value. It also means making your mark on Accordion’s future.

With the London office launching our European footprint, London-based Accordionites will have a unique opportunity to flex their entrepreneurial muscles and drive our business forward in the European market.

Accordion is headquartered in New York City with 10 offices around the globe. Come join us as we build something great, together.

We are seeking a versatile Security Engineer to join our small, fast-paced security team. This role supports a wide range of security functions, emphasizing hands-on technical expertise, proactive problem-solving, and adaptability across network security, cloud security, incident response, vulnerability management, and security tool administration.

This role can be based in our London office with the flexibility to work remotely 1-2 days a week, blending the best of both worlds for efficiency and collaboration.

• Manage and operate our XDR platform: triage alerts, conduct investigations, and take response actions.
• Create security automation through our XDR platform and in our other tools
• Configure, review, and enhance our SIEM solution
• Assist with vulnerability management: apply threat modeling of identified CVEs, coordinate technical remediation, propose solutions, and document outcomes.
• Administer email security systems: respond to phishing attempts, maintain and improve filters, investigate suspicious email traffic, and provide quick technical response to threats.
• Deploy, integrate, and maintain diverse security tools: drive lifecycle management, automation of routine security operations, and ensure seamless integration with existing infrastructure.
• Support security awareness and technical training: deliver targeted education and assist users in following security best practices.
• Provide incident response across environments: analyze, contain, document, and automate response processes.
• Collaborate with IT and security leadership to assess risks and prioritize technical security tasks based on business urgency and threat landscape.
• Operate and optimize virtualized Layer 7 firewalls (Palo Alto, Fortinet, Juniper, etc.): configure policies, tune rules, and troubleshoot firewall and traffic anomalies.
• Provide hands-on support for cloud security operations—design, implement, and monitor Azure networking (with emphasis on Azure Network Security Groups), enforce cloud security best practices, assess cloud risks, and collaborate on secure cloud architecture.
• Administer and optimize network infrastructure, including Meraki environments, with a focus on monitoring, troubleshooting, device configuration, and reviewing network security alerts.
• Manage end-to-end network troubleshooting: identify, analyze, and resolve network performance and security issues across LAN, WAN, and cloud-connected infrastructure.

• 2+ years of experience in security operations, with demonstrated responsibility for network and cloud environments.
• In-depth expertise in network management and troubleshooting—including Meraki, multi-vendor LAN/WAN, and cloud-connected scenarios.
• Working knowledge of scripting/automation (Python, Power Shell, Bash): ability to streamline security operations, automate repetitive tasks, and integrate systems.
• Proven experience with Crowd Strike (or similar XDR), SIEM platforms, and security tool deployment/integration.
• Hands-on experience with Azure networking and security groups, with a strong understanding of cloud security requirements.
• Experience with vulnerability management processes, threat modeling, and technical remediation.
• Strong incident…