Senior Security Engineer - Detection and Response

Klaviyo•Boston, MA

21h•Remote

About The Position

Klaviyo is seeking a Senior Security Engineer to join their Detection and Response (D&R) Team. This is a hands-on technical role focused on building and maintaining secure, reliable, and scalable detection and response systems to improve security observability. The role involves participating in the full lifecycle of detection development and response, supporting threat response operations, and leveraging security and engineering skills to provide thought leadership, solve complex security challenges, and enhance Klaviyo's overall security posture.

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

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