Senior Security Engineer - Detection & Response

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 klaviyo.com/careers to see how we empower creators to own their own destiny.

Klaviyo is looking for a Senior Security Engineer to add to our growing Detection & Response Team. This is an engineering role that spans the full detection and response lifecycle - leveraging software development practices to build detections, triaging alerts, lead investigations, respond to incidents, perform threat hunting, and build the tooling that keeps us from doing the same work twice. As a member of the team, you will have the opportunity to work on complex large-scale security challenges across Klaviyo’s enterprise, cloud, and product environments, and shape how an engineering-first D&R function uses automation and AI in production, at scale, alongside talented and ambitious colleagues spanning multiple regions and timezones.

How you will make a difference

Leverage engineering practices to develop, test, and deploy high-fidelity rule-based and anomaly-based detections-as-code

Detect and respond to cyber threats using security data lake, SIEM, and cloud platforms

Respond to alerts, cyber threats, and drive end-to-end incident response investigations

Perform digital forensic investigations to include collection and analysis of evidence

Automate and codify detection and response workflows and processes

Build security tooling to drive automation across D&R lifecycle

Improve and maintain detection and response pipelines and underlying systems

Work with our Threat Intelligence team to identify and respond to sophisticated threats

Develop AI-first security systems to automate detection and response operations

Conduct threat hunts across corporate, cloud and product environments

Support data engineering workflows for core security data lake and SIEM platforms

Be an active member of D&R on-call rotations

Coach and mentor security engineers within the detection & response team

We’d love to hear from you if you have

5+ years of hands-on security experience in modern cloud environments

Experience in triaging and responding to cyber threats

Experience in large-scale log analysis, incident response and/or digital forensics

Experience with centralized security data lakes and SIEM solutions

Hands-on experience in writing detections-as-code

Solid data querying skills (e.g. SQL, Splunk)

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

Engineering-first and AI-first approach for all work performed

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

Our salary range reflects the cost of labour in the country where the job post is advertised. 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.

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