Senior Security Engineer - Detection & Response, AI-First

Klaviyo Inc.; Denver (CO); On-site; USD 142,000 - 212,000; Full time

Job summary

Klaviyo Inc. is seeking a Senior Security Engineer to join the Detection & Response Team.

This engineering role spans the full detection and response lifecycle—building detections, triaging alerts, leading investigations, and automating workflows across enterprise, cloud, and product environments. You will work on AI-first security systems, threat hunting, and on-call rotations, mentoring teammates and collaborating with Threat Intelligence.

Qualifications

• 5+ years 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.

Responsibilities

• 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 Threat Intelligence 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.

Skills

Cloud security

Incident response

Threat hunting

Detections-as-code

Python/Go

SQL/Splunk

Git/GitHub

CI/CD automation

On-call

Tools

SIEM

Data lake

Threat intel tools

Job description

Klaviyo Inc. is seeking a Senior Security Engineer to join the Detection & Response Team.

This engineering role spans the full detection and response lifecycle—building detections, triaging alerts, leading investigations, and automating workflows across enterprise, cloud, and product environments. You will work on AI-first security systems, threat hunting, and on-call rotations, mentoring teammates and collaborating with Threat Intelligence.