[Remote] Lead Security Engineer, Cloud Infrastructure

Note: The job is a remote job and is open to candidates in USA. Klaviyo is a company that empowers creators to own their destiny by making first-party data accessible and actionable. As a Lead Security Engineer, you will focus on strengthening the security posture across Klaviyo’s technology environment, developing security architectures, and mentoring colleagues while collaborating with cross-functional teams to address emerging threats. Responsibilities • Secure Klaviyo's infrastructure by designing, implementing, and maintaining scalable security controls across cloud, on-prem, and hybrid environments • Evaluate and improve security configurations and policies across a range of technologies, using your domain expertise to reduce risk and enable secure-by-default architectures • Collaborate with engineering and IT teams to embed security practices and develop repeatable security patterns across the development and deployment lifecycle • Lead threat modeling, risk assessments, and architecture reviews in areas aligned with your specialty • Develop automated solutions and infrastructure-as-code to drive consistent and reproducible security outcomes • Stay ahead of the latest threats and advocate for innovative security solutions aligned with business needs • Help define security standards and best practices at Klaviyo, championing their adoption across teams Skills • 5+ years of experience in infrastructure or security engineering roles, with deep knowledge in one or more security focus areas (e.g., cloud security, IAM, endpoint security, data protection, detection engineering, compliance) • Comfortable navigating ambiguity and defining priorities in a broad-scoped role • Experienced working in modern cloud environments such as AWS, GCP, or Azure • Familiar with infrastructure-as-code tools such as Terraform, CloudFormation, or Pulumi • Proficient in secure systems design, threat modeling, and vulnerability management • AI Agentic development and prompt engineering, MCP (AWS Bedrock, OpenAI, Anthropic) • Able to clearly articulate complex security topics to technical and non-technical stakeholders • Passionate about security, eager to learn from others and share your expertise • Certifications (e.g., CISSP, CKS, GCP/AWS Security certs) or equivalent practical experience Benefits • Participation in the company’s annual cash bonus plan • Variable compensation (OTE) for sales and customer success roles • Equity • Sign-on payments • A comprehensive range of health, welfare, and wellbeing benefits based on eligibility Company Overview • Klaviyo is an automation and email platform designed to help grow businesses. It was founded in 2012, and is headquartered in Boston, Massachusetts, USA, with a workforce of 1001-5000 employees. Its website is Company H1B Sponsorship • Klaviyo has a track record of offering H1B sponsorships, with 47 in 2025, 29 in 2024, 24 in 2023, 27 in 2022, 21 in 2021, 8 in 2020. Please note that this does not guarantee sponsorship for this specific role. Apply tot his job