Senior Backend Engineer, Precision Defense at horizon3ai · LumiJobs

Responsibilities

As a Senior Backend Engineer on the Precision Defense team, you'll help build the systems that move our customers from reactive security toward proactive, evidence-based defense. The team operates across three closely related areas — Rapid Response, Tripwires/Deception, Security Controls/EDR, and Autonomous Defense — and you'll contribute to backend infrastructure that spans all of them.
Depending on where you land within the team, your focus might include: analyzing and surfacing emerging vulnerability intelligence; building and scaling the workflows that help customers identify exposed assets and validate their defenses; deploying and improving deception signals that catch attackers in the act; or producing credible evidence that endpoint detection and response (EDR) controls are working as expected. Across all of these, the common thread is translating attacker-informed findings into measurable defensive outcomes for our customers.
This is a high-impact role on a team that owns customer-facing security workflows, supports production incidents, and ships features that directly influence how organizations understand and close their defensive gaps.
Build and maintain backend APIs, ETL pipelines, and data processing systems that power Rapid Response, Tripwires, EDR effectiveness, and Autonomous Defense workflows.
Design and implement GraphQL APIs to facilitate data interactions across product components.
Develop event-driven services and distributed systems that support reliable, scalable security automation.
Collaborate with frontend engineers, attack engineers, and product managers to deliver customer-facing features that communicate security findings clearly and actionably.
Contribute to production reliability: monitoring, alerting, incident response, and debugging across ETL, deployment, and data-propagation workflows.
Support safe, explainable, and reversible security automation — understanding that incorrect behavior in this domain can mean missed detections, noisy alerts, or false confidence for customers.
What You'll Bring:
Ability to own and manage concurrent initiatives, demonstrating effective judgment in prioritization and time management.
Driven, self-managed, capable of conceiving and implementing solutions on your own and with a team.

Senior Backend Engineer, Precision Defense

Responsibilities

Benefits

Company

horizon3ai

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