Senior Security Engineer - Detection and Response

<div class="content-intro"><p><em>At Klaviyo, we value the unique backgrounds, experiences and perspectives each Klaviyo (we call ourselves Klaviyos) 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 <a class="_ymio1r31 _ypr0glyw _zcxs1o36 _mizu194a _1ah3dkaa _ra3xnqa1 _128mdkaa _1cvmnqa1 _4davt94y _4bfu18uv _1hms8stv _ajmmnqa1 _vchhusvi _kqswh2mm _ect4ttxp _syaz13af _1a3b18uv _4fpr8stv _5goinqa1 _f8pj13af _9oik18uv _1bnxglyw _jf4cnqa1 _30l313af _1nrm18uv _c2waglyw _1iohnqa1 _9h8h12zz _10531ra0 _1ien1ra0 _n0fx1ra0 _1vhv17z1" href="http://klaviyo.com/careers" data-renderer-mark="true">klaviyo.com/careers</a> to see how we empower creators to own their own destiny.</em></p></div><p>Klaviyo is looking for a <strong>Senior Security Engineer</strong> to add to our growing Detection and Response (D&R) Team. This is a hands-on technical role that involves building and maintaining secure, reliable, and scalable detection and response systems to enhance our security observability capabilities. This role will also be responsible for participating in full end-to-end detection development and response lifecycle and support with threat response operations. As a Senior Security Engineer, you will have the opportunity to leverage your security and engineering skills to provide thought leadership, solve complex security challenges and ultimately improve Klaviyo’s overall security posture. </p> <p><strong>How you will make a difference:</strong></p> <ul> <li>Build systems that facilitate security observability for detection and response </li> <li>Develop AI-first security systems to automate detection and response operations</li> <li>Onboard, normalize and optimize security logging data for large-scale data analysis, detection engineering, deployment of ML models, and efficient querying during incidents.</li> <li>Develop high-fidelity rule-based and/or ML-based detections as code</li> <li>Respond to security alerts, cyber threats, and security incidents </li> <li>Drive end-to-end incident response investigations  </li> <li>Automate and codify detection and response workflows and processes</li> <li>Conduct ad-hoc threat hunts and be an active member of D&R on-call rotations </li> </ul> <p><strong>We’d love to hear from you if you have:</strong></p> <ul> <li>5+ years of experience in software, security, and/or data engineering </li> <li>Automation-first and AI-first approach for all work performed</li> <li>Experience with centralized logging, data lakes, and SIEM solutions</li> <li>Familiarity with large-scale data pipelines and data engineering techniques </li> <li>Proficient in programming languages to automate / build (e.g., Python, Go or similar)</li> <li>Proven experience with git/GitHub and CI/CD automations </li> <li>Familiarity with tactics, techniques, and procedures used by threat actors</li> <li>Experience being part of detection and response or incident response on-call </li> <li>Strong passion for continuous learning and staying updated on evolving technology </li> <li>Strong oral and written communication skills</li> <li>Team player with a strong, self-managing work ethic</li> </ul><br><p>We use Covey as part of our hiring and / or promotional process. For jobs or candidates in NYC, certain features may qualify it as an AEDT. As part of the evaluation process we provide Covey with job requirements and candidate submitted applications. We began using <a href="https://getcovey.com/product/covey-scout-inbound">Covey Scout for Inbound</a> on April 3, 2025.</p><p>Please see the independent bias audit report covering our use of Covey <a href="https://getcovey.com/nyc-local-law-144" style="text-decoration:underline">here</a></p><div class="content-pay-transparency"><div class="pay-input"><div class="description"><p><strong>Massachusetts Applicants:<br></strong>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.</p> <hr> <p>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.</p> <p>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. </p> <p>Your recruiter can provide more details about the specific salary/OTE range for your preferred location during the hiring process.</p></div><div class="title">Base Pay Range For US Locations:</div><div class="pay-range"><span>$141,600</span><span class="divider">—</span><span>$212,400 USD</sp