Senior Security Engineer – AI-Driven Detection & Response

Klaviyo Inc.; Greater London; Hybrid; GBP 84,000 - 126,000; Full time

Job summary

Klaviyo is seeking a Senior Security Engineer to join the Detection & Response Team. You will develop detections, triage alerts, lead investigations, and build tools for scalable security across enterprise, cloud, and product environments.

You will work on threat hunts, automate detection pipelines, and collaborate with Threat Intelligence to counter sophisticated threats while shaping AI-first security solutions. This role involves on-call rotations and mentoring teammates.

Qualifications

• 5+ years hands-on security 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.

Responsibilities

• Develop detections-as-code and deploy high-fidelity detections.
• Detect and respond to cyber threats using security data lake, SIEM, and cloud platforms.
• Lead end-to-end incident response investigations.
• Perform digital forensic investigations including 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.
• Collaborate with Threat Intelligence to identify 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 D&R team.

Skills

Security engineering

Cloud environments

Incident response

Threat hunting

Automation/CI/CD

Python

Go

SQL/Splunk queries

Communication skills

Tools

SIEM

Data lake

Git/GitHub

CI/CD tooling

Python

Job description

Klaviyo is seeking a Senior Security Engineer to join the Detection & Response Team. You will develop detections, triage alerts, lead investigations, and build tools for scalable security across enterprise, cloud, and product environments.

You will work on threat hunts, automate detection pipelines, and collaborate with Threat Intelligence to counter sophisticated threats while shaping AI-first security solutions. This role involves on-call rotations and mentoring teammates.