AI-First Security Engineer: Detection & Response

Klaviyo Inc.; San Francisco, Northern (CA, KY); Hybrid; USD 142,000 - 212,000; Full time

Job summary

Klaviyo is looking for a Senior Security Engineer to join our Detection & Response Team. This is an engineering role that spans the full detection and response lifecycle—building detections, triaging alerts, leading investigations, and shaping AI-first security tooling across enterprise, cloud, and product environments.

As part of the D&R team, you will conduct threat hunts, incident response, and forensics, while automating workflows and building security tooling.

Qualifications

• 5+ years of hands-on security experience in modern cloud environments.
• Experience 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.
• Proficient in data querying with SQL (and tools like Splunk).
• Proficient in programming languages to automate/build (Python, Go).
• Experience with Git/GitHub and CI/CD automation.
• Familiarity with threat actor TTPs and on-call IR.
• Engineering-first and AI-first approach for security work.

Responsibilities

• 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.

Skills

Detections-as-code

SQL

Splunk

Python

Go

Git/GitHub

CI/CD

Cloud environments

Incident response

Digital forensics

Tools

Security data lake

SIEM platforms

Job description

Klaviyo is looking for a Senior Security Engineer to join our Detection & Response Team. This is an engineering role that spans the full detection and response lifecycle—building detections, triaging alerts, leading investigations, and shaping AI-first security tooling across enterprise, cloud, and product environments.

As part of the D&R team, you will conduct threat hunts, incident response, and forensics, while automating workflows and building security tooling.