Klaviyo is looking for a Senior Security Engineer 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. 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 Klaviyos overall security posture.

Build systems that facilitate security observability for detection and response Develop AI-first security systems to automate detection and response operations Onboard, normalize and optimize security logging data for large-scale data analysis, detection engineering, deployment of ML models, and productive querying during incidents. Develop high-fidelity rule-based and/or ML-based detections as code Respond to security alerts, cyber threats, and security incidents 5+ years of experience in software, security, and/or data engineering ~ Automation-first and AI-first approach for all work performed ~ Experience with centralized logging, data lakes, and SIEM solutions ~ Familiarity with large-scale data pipelines and data engineering techniques ~ Proficient in programming languages to automate / build (e.g., Python, Go or similar) ~ Familiarity with tactics, techniques, and procedures used by threat actors ~ 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.

The base salary offered for this position is determined by several factors, including the applicants 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 companys 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. 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. We empower creators to own their destiny by making first-party data accessible and actionable like never before. To reach our goals, we need our own crew of remarkable creatorsmbitious and collaborative teammates who stay focused on our north star: delighting our customers.

AI fluency at Klaviyo includes responsible use of AI (including privacy, security, bias awareness, and human-in-the-loop). By participating in Klaviyos 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. 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. 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.

📌 Senior Security Engineer - Testing (Northumberland County)
🏢 Klaviyo
📍 Northumberland County