Senior Security Engineer - Detection and Response

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. 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.

How you will make a difference:

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 efficient querying during incidents.

Develop high-fidelity rule-based and/or ML-based detections as code

Respond to security alerts, cyber threats, and security incidents

Drive end-to-end incident response investigations

Automate and codify detection and response workflows and processes

Conduct ad-hoc threat hunts and be an active member of D&R on-call rotations

We’d love to hear from you if you have:

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)

Proven experience with git/GitHub and CI/CD automations

Familiarity with tactics, techniques, and procedures used by threat actors

Experience being part of detection and response or incident response on-call

Strong passion for continuous learning and staying updated on evolving technology

Strong oral and written communication skills

Team player with a strong, self-managing work ethic

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 Covey Scout for Inbound on April 3, 2025.

Please see the independent bias audit report covering our use of Covey here

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:

$141,600—$212,400 USD