Lead Security Engineer, Cloud Infrastructure

At Klaviyo, we value the unique backgrounds, experiences and perspectives each Klaviyo (we call ourselves Klaviyo) brings to our workplace each and every day. We believe everyone deserves a fair shot at success and appreciate the experiences each person brings beyond the traditional job 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? Visit careers.klaviyo.com to see how we empower creators to own their own destiny.

As a Lead Security Engineer, you’ll be a vital part of the Infrastructure Security Team, focusing on strengthening the security posture across Klaviyo’s entire technology environment, developing security architectures and repeatable patterns and mentoring colleagues and junior security engineers. Unlike roles with a narrowly defined specialty, this position offers the opportunity to demonstrate your unique expertise—whether that’s in cloud security, identity and access management, data protection, secure systems design, or other security domains. Your work will involve evaluating and hardening our infrastructure, collaborating with cross-functional teams, and leveraging AI to build scalable solutions to address emerging threats.

We are looking for someone who is excited to bring their specialized skills to the team, shaping Klaviyo’s security practices and helping us continue to raise the bar.

How You Will Make a Difference

• 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

Who You Are

Base Pay Range For US Locations : $220,000 — $330,000 USD

Get to Know Klaviyo

We’re Klaviyo (pronounced clay-vee-oh). We empower creators to own their destiny by making first-party data accessible and actionable like never before. We see limitless potential for the technology we’re developing to nurture personalized experiences in ecommerce and beyond. To reach our goals, we need our own crew of remarkable creators—ambitious and collaborative teammates who stay focused on our north star : delighting our customers. If you’re ready to do the best work of your career, where you’ll be welcomed as your whole self from day one and supported with generous benefits, we hope you’ll join us.

AI fluency at Klaviyo includes responsible use of AI (including privacy, security, bias awareness, and human-in-the-loop). We provide accommodations as needed.

By participating in Klaviyo’s interview process, you acknowledge that you have read, understood, and will adhere to our Guidelines for using AI in the Klaviyo interview Process. For more information about how we process your personal data, see Job Applicant Privacy Notice.

Massachusetts Applicants :

It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability.

Klaviyo is committed to a policy of equal opportunity and non-discrimination. We do not discriminate on the basis of race, ethnicity, citizenship, national origin, color, religion or religious creed, age, sex (including pregnancy), gender identity, sexual orientation, physical or mental disability, veteran or active military status, marital status, criminal record, genetics, retaliation, sexual harassment or any other characteristic protected by applicable law.

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