Lead Security Engineer, Enterprise Security

At Klaviyo, we value the unique backgrounds, experiences and perspectives each Klaviyo (we call ourselves Klaviyos) brings to our workplace each and every day.

Requirements

If you’re a close but not exact match with the description, we hope you’ll still consider applying. Want to learn more about life at Klaviyo? com/careers to see how we empower creators to own their own destiny.

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.

through production

Who You Are

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 secur