Senior Security Engineer, Threat Detection & Response

Klaviyo is looking for a Senior Security Engineer to add to our growing Detection and Response (D&R) Team. This hands-on technical role involves building and maintaining secure detection and response systems, participating in the full detection development and response lifecycle, and supporting threat response operations to enhance Klaviyo’s security posture.

Responsibilities:

• 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

Requirements:

• 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