Cloud Security Engineer in London

Fin is the AI Customer Agent company on a mission to help businesses provide perfect customer experiences. Our AI Agent Fin is the highest-performing AI Customer Agent on the market today, enabling businesses to deliver impeccable, always-on customer support across the customer journey – from service, to sales, to ecommerce. Powered by our own AI models, Fin resolves complex customer issues end-to-end across every channel, with minimal set-up and integration.

The Cloud Security team is responsible for protecting the platforms that power Fin. We partner closely with infrastructure and product engineering teams to secure cloud environments, detect emerging threats, respond to incidents, and build the security foundations that enable teams to move quickly with confidence. The team owns critical cloud security capabilities including detection engineering, cloud security monitoring, incident response, cloud security controls, and the security tooling that protects Fin's production environments.

The mission of the team is to help Fin build and operate trusted AI-powered customer service experiences by making security a natural part of how our cloud platforms, production systems, and engineering workflows are designed, deployed, and operated. As Fin continues to expand its capabilities and adoption, you'll help define how cloud security evolves alongside increasingly sophisticated systems and threat models.

What will I be doing?

• Design and implement secure cloud architectures across our AWS environments.
• Build and maintain protective and detective controls that improve visibility into threats across our cloud environments.
• Develop detection engineering capabilities that identify attacker behaviour and reduce time to detection and response.
• Lead cloud security investigations and incident response activities in partnership with engineering teams.
• Participate in a shared on-call rotation and help coordinate containment, remediation, and recovery efforts during security incidents.
• Build automation that improves the scalability, reliability, and effectiveness of security controls.
• Partner with infrastructure teams to embed security into cloud platforms, infrastructure-as-code workflows, and engineering practices.
• Develop and improve cloud security standards, guidance, and best practices across Fin.
• Drive security initiatives from problem definition through design, implementation, and measurable outcomes.
• Assess emerging threats to cloud environments and help evolve our defensive capabilities.
• Help shape Fin's AI-first approach to security, including AI-assisted detection, automated investigations, continuous monitoring, and emerging defensive capabilities.
• Support the secure adoption of AI-assisted software development tools and engineering workflows.

What skills do I need?

• Proven experience in cloud security, security engineering, detection engineering, or a closely related field.
• Strong experience securing and operating production AWS environments.
• Deep understanding of cloud security principles, modern attack techniques, and security best practices.
• Experience building or operating detection, monitoring, or threat detection capabilities.
• Hands-on experience investigating security incidents, leading technical investigations, and driving remediation efforts.
• Experience implementing security controls across cloud platforms and production environments.
• Strong programming skills and experience building automation, tooling, or operational workflows.
• Experience working with infrastructure-as-code practices and modern cloud-native technologies.
• Comfortable using modern AI-assisted development tools to improve productivity and engineering effectiveness.
• Ability to communicate security concepts clearly and collaborate effectively with engineering teams.
• A pragmatic approach to balancing security, customer impact, and engineering velocity.

Bonus skills & attributes

• Experience building detection engineering, threat hunting, or security operations capabilities at scale.
• Experience with cloud-native security platforms, CNAPP technologies, or large-scale cloud security monitoring.
• Experience applying AI to detection, response, threat analysis, or security operations workflows.
• Familiarity with AWS networking, identity, and cloud security patterns.
• Experience working across both large-scale SaaS environments and high-growth companies.

Benefits

• Competitive salary and equity in a fast-growing start-up.
• We serve lunch every weekday, plus a variety of snack foods and a fully stocked kitchen.
• Regular compensation reviews – we reward great work!
• Unlimited access to Claude Code and best-in-class AI tools; experimentation & building is encouraged & celebrated.
• Pension scheme & match up to 4%.
• Peace of mind with life assurance, as well as comprehensive health and dental insurance for you and your dependents.
• Flexible paid time off policy.
• Paid maternity leave, as well as 6 weeks paternity leave for fathers, to let you spend valuable time with your loved ones.
• If you’re cycling, we’ve got you covered on the Cycle-to-Work Scheme. With secure bike storage too.
• MacBooks are our standard, but we also offer Windows for certain roles when needed.