Senior Security Engineer, Detection & Response

Aircall is a unicorn, AI-powered customer communications platform used by 22,000+ companies worldwide to drive revenue, resolve issues faster, and scale customer-facing teams. We’re redefining customer communications by bringing voice, SMS, WhatsApp, and AI together into one seamless workspace. Our momentum comes from a simple idea: help teams work smarter, not harder. Aircall’s AI Voice Agent automates routine calls, AI Assist streamlines post-call work, and AI Assist Pro delivers real-time guidance so people can do their best work. The result is higher revenue, faster resolutions, and teams that scale with confidence. Aircall is headquartered in Paris, our European HQ, with a strong North American presence anchored in Seattle, our North American HQ, and teams across Madrid, London, Berlin, San Francisco, New York City, Sydney, and Mexico City. We’ve built a product customers love and a business that’s scaling quickly, backed by world-class investors and driven by rapid AI innovation across multiple product lines. At Aircall, you’ll join a company in motion. We’re ambitious, product-driven, and execution-focused, with visible impact, fast decisions, and real growth. How we work at Aircall : We’re customer-obsessed, data-driven, and focused on delivering meaningful outcomes. We value ownership, continuous learning, and thoughtful speed. If you thrive in a collaborative, fast-moving environment where trust and impact matter, you’ll feel at home here. About the Role As a Senior Security Engineer, Detection and Response you will develop, scale, and evolve Aircall's threat detection and response capabilities. You will take ownership of building detections from scratch, leading investigations, and driving the maturity of our detection program. This is an owner-operator role. You will not be solely responding to alerts or consuming a detection platform that someone else runs, you will build and run it: the ingestion pipelines, the Terraform that defines them across sandbox, staging and production AWS accounts, the retention and cost posture, and the automation layered on top. Roughly two-thirds of the work is software and platform engineering; the remaining third is investigation, incident response and threat hunting. Expect to write production Python and Terraform every week, working alongside a product security, cloud and infrastructure security team you will partner with closely. Our team builds the best solutions to our biggest problems, over the past year we've built our own AI SOC & IR agent, and we're applying those lessons to how we protect customer-facing AI products. Responsibilities Leading direction and strategy of the DART program at Aircall Lead end-to-end development of detection logic: from threat modeling and hypothesis to writing, testing, simulation, tuning, and deploying detection rules and alerts across logs, telemetry, host, network, and cloud. Own the security data platform end to end. Operate and…