Lead Security Engineer, Enterprise Security
About the role
The Lead Security Engineer on the Enterprise Security team at Klaviyo plays a central role in securing the corporate systems and platforms that Klaviyo runs on. This role spans critical SaaS applications, identity and access, endpoints, Zero Trust network architecture, and perimeter security. The role requires a hands-on technical leadership approach, delivering complex, cross-functional projects end-to-end, establishing design patterns and standards, and mentoring the engineers around you.
Responsibilities
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.
Requirements
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.
Be proficient with Terraform for building and maintaining infrastructure-as-code across enterprise security systems.
Experience 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.
Experience 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.
Qualifications
Experienced mentoring engineers and working through influence: you raise the bar for the people around you and hold team-wide technical standards.
Skills
Deep expertise in at least one enterprise security domain and the range to work credibly across several others.
AI fluency at every stage of your work, from designing solutions to iterating on implementations, and taking full ownership of the quality and security of what you ship.
Benefits
Our salary range reflects the cost of labor across various U.S. geographic markets. The range displayed below reflects the minimum and maximum target salaries for the position across all our US locations. The base salary offered for this position is determined by several factors, including the applicant’s job-related skills, relevant experience, education or training, and work location. In addition to base salary, our total compensation package may include participation in the company’s annual cash bonus plan, variable compensation (OTE) for sales and customer success roles, equity, sign-on payments, and a comprehensive range of health, welfare, and wellbeing benefits based on eligibility.
Pay
Base Pay Range For US Locations: $175,200—$262,800 USD
Schedule
This role is hybrid, with an expectation of coming into the office three (3) times per week.
Additional Information
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.
This role may require up to 10% travel for purposes such as new hire onboarding, client or partner work if applicable, team meetings, and industry events. Travel is coordinated in advance.
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 our Job Applicant Privacy Notice.
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.