Principal Engineer, Security

Who You Are Experience: 10+ years in infrastructure or platform security engineering, with a track record of shipping security improvements that measurably reduced risk or improved compliance posture at scale. Technical depth: Deep in cloud infrastructure security (AWS/GCP IAM, service mesh mTLS, secrets management, network defenses); you architect and ship production controls, not just audit them. SLO and compliance rigor: You define security SLOs, track MTTR for vulnerabilities, and communicate risk posture clearly; you translate security work into business language that non-security stakeholders act on. Developer-centric mindset: You build tools and guardrails that other engineers adopt because they make their work easier—not because they're required to. Cross-org influence: You align teams through threat models, security reviews, and IaC guardrails; you earn credibility via code, design quality, and clear reasoning, not title. Operational excellence: You've been on-call for security incidents. You write runbooks, lead readiness reviews, and treat recurring vulnerabilities as systemic engineering problems. Communication: You write crisp ADRs and RFCs, run effective security design reviews, and translate risk exposure into decisions business stakeholders can act on. AI tools and automation: You've brought AI into security engineering, automated threat detection, intelligent vulnerability triage, AI-assisted compliance checks, or security copilots—with explicit guardrails and audit trails. You've already experimented with AI in work or personal projects, and you're excited to dive in and learn fast. You're hungry to responsibly explore new AI tools and workflows, finding ways to make your work smarter and more efficient. Nice to Haves Experience with zero-trust architecture and progressive access control in a large multi-tenant SaaS environment. Deep familiarity with enterprise compliance frameworks (SOC 2, ISO 27001, GDPR) and the infrastructure controls that underpin them. Track record of embedding security tooling into CI/CD and IaC pipelines adopted org-wide. Experience securing AI/ML systems: model access controls, data privacy guardrails, and agentic system security boundaries. Success in 6 - 12 Months Security guardrails codified as IaC modules and enforced in paved roads; IAM and secrets management posture measurably improved. Security SLO framework established; MTTR for critical vulnerabilities trending down; recurring vulnerability classes addressed systemically. Zero-trust progress measurable against defined milestones; demonstrable audit readiness for SOC 2 / ISO 27001. 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. 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. Your recruiter can provide more details about the specific salary/OTE range for your preferred location during the hiring process. Base Pay Range For US Locations: $244,000 — $366,000 USD 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. IMPORTANT NOTICE: Our company takes the security and privacy of job applicants very seriously. We will never ask for payment, bank details, or personal financial information as part of the application process. All our legitimate job postings can be found on our official career site. Please be cautious of job offers that come from non-company email addresses (@klaviyo.com), instant messaging platforms, or unsolicited calls. By clicking "Submit Application" you consent to Klaviyo processing your Personal Data in accordance with our Job Applicant Privacy Notice. If you do not wish for Klaviyo to process your Personal Data, please do not submit an application. You can find our Job Applicant Privacy Notice here and here (FR).

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