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As a Lead Security Engineer on the Enterprise Security team, you'll play a central role in securing the corporate systems and platforms that Klaviyo runs on - spanning critical SaaS applications, identity and access, endpoints, Zero Trust network architecture, and perimeter security. You'll partner across Engineering, IT, and the broader Security organization to mature existing programs, introduce new capabilities, and ensure our corporate security posture keeps pace with a fast-moving, AI-first company.

This is a hands-on technical leadership role. You'll be expected to deliver complex, cross-functional projects end to end, establish the design patterns and standards your team works from, and mentor the engineers around you. You bring deep expertise in at least one enterprise security domain and the range to work credibly across several others.

At Klaviyo, AI fluency isn't optional - it's foundational. You'll lead with AI at every stage of your work, from designing solutions to iterating on implementations, and you'll take full ownership of the quality and security of what you ship.

• Partner across several teams to drive the security architecture and lifecycle of Klaviyo's critical SaaS applications, from procurement to offboarding
• Ensure the design and operations of identity and access management (IAM) across corporate SaaS platforms, including Just-in-Time Access (JITA), privilege management, and SSO/SCIM integrations; ensuring identity implementation meets or exceeds security standards
• Mature and expand Klaviyo's Zero Trust network architecture - establishing web gateways, defining secure access policies, and building the foundation for a modern corporate network security posture
• Champion an AI-first approach to security engineering: designing, prototyping, and iterating with AI tools, and owning the responsible review and deployment of AI-generated artifacts
• Manage and mature Cloudflare WAF policies and other perimeter security controls, ensuring coverage, tuning, and continuous improvement
• Expand and mature Klaviyo's endpoint security strategy and tooling, partnering with IT, Detection, Response, and the broader security teams to achieve full endpoint visibility, proactive threat coverage, and rapid response capability across the fleet
• Deliver complex, multi-team projects by decomposing technical problems into actionable workstreams, setting the pace through all phases from requirements through production

• Have 7+ years of experience in security or infrastructure engineering roles, with demonstrated ownership of enterprise security domains such as SaaS security, IAM, Zero Trust, endpoint security, or cloud-delivered security services
• Approach every project AI-first: you design with AI, refine with AI, and take full responsibility for validating and owning what you deploy - you are not a passive consumer of AI output
• Hands-on by default - you are equally comfortable writing policy-as-code, reviewing architecture, and debugging a production issue
• Proficient with Terraform for building and maintaining infrastructure-as-code across enterprise security systems
• Experienced operating in AWS environments, with strong familiarity with cloud security services, IAM policies, and secure architecture patterns
• Experience with enterprise IdP solutions such as Okta, AWS Cognito
• Experienced with enterprise security tooling such as Cloudflare (WAF, gateway), Wiz (CNAPP/cloud security), and CrowdStrike (EDR/endpoint)
• Knowledgeable in secrets management, JITA, and modern identity patterns including SSO, SCIM, and privileged access workflows including SAML 2.0, SCIM, OAuth and OIDC - note this is not a dedicated IAM role; fluency in these areas supports broader enterprise security ownership, not identity program management
• Experienced mentoring engineers and working through influence: you raise the bar for the people around you and hold team-wide technical standards
• Nice to have: experience with GCP or Azure environments, Spacelift for IaC orchestration, AI agent development, or securing AI coding platforms (e.g., Lovable, Vercel, Cursor)

This role is hybrid, with an expectation of coming into the office three (3) times per week.