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Senior Detection Engineer, Autonomous Defense at Horizon3

Horizon3

Define the security meaning and remediation requirements behind Horizon3 attack detections. Provide domain criteria that product, engineering and AI research teams can implement and measure. The employer describes this as a detection-domain role rather than a coding role. Remote in the United States.

Applied AI Engineer, Autonomous Defense at Horizon3

Horizon3

Build AI agents that reason from confirmed attack paths to defensive changes such as EDR policies, firewall rules, cloud IAM and detection content. Validate repairs by rerunning the attack. This posting lists remote work in the United States.

Senior Autonomous Defense Backend Engineer at Horizon3

Horizon3

Build the distributed platform for NodeZero defensive agents operating across customer environments. Support isolated execution, approvals, staged changes, rollback and auditable evidence before agents alter production controls. This posting lists remote work in the United States.

Senior Machine Learning Engineer, Autonomous Defense at Horizon3

Horizon3

Move defensive AI models from research into production at Horizon3. Build reproducible training pipelines, CI evaluations, versioned releases, canary and rollback paths, and monitoring for model quality, cost and latency. The posting lists remote work in the United States.

Staff Autonomous Defense Software Engineer at Horizon3

Horizon3

Lead technical work on NodeZero defensive agents that turn confirmed attack paths into ongoing remediation. Set architecture, write production code and mentor engineers while working with AI researchers and product teams. The posting lists remote work in the United States.

Staff Active Directory Attack Engineer at Horizon3

Horizon3

Lead NodeZero attack capabilities for internal networks and Active Directory, safely proving exploitable paths involving identity, Kerberos and enterprise management systems. This posting lists remote work in the United States.

Senior Backend Data and Application Platform Engineer at Horizon3

Horizon3

Build and operate distributed backend services and data processing for Horizon3 pentests. Improve PostgreSQL schemas, migrations and query performance, define service targets and monitor production operations. The posting lists remote work in the United States.

Senior Backend Engineer, Precision Defense at Horizon3

Horizon3

Build backend APIs, ETL pipelines and data processing for Horizon3 defense workflows. Design GraphQL and event-driven services, and collaborate with frontend and attack engineers on actionable security findings. The posting lists remote work in the United States.

Senior Data Engineer at Horizon3

Horizon3

Design and operate production data pipelines and warehouse models for Horizon3, including batch and streaming tradeoffs, event contracts, reprocessing and observability. The posting lists remote work in the United States.

Staff Technical Support Engineer, Web App at Horizon3

Horizon3

Solve complex enterprise issues involving Horizon3 cloud infrastructure, networking and security. Act as a senior technical authority, using Linux and container expertise to coordinate fixes with engineering teams. The posting lists remote work in the United States.

Staff Tripwires Software Engineer at Horizon3

Horizon3

Lead architecture and implementation for Horizon3 detection capabilities, turning network-security goals into a technical roadmap and production Python systems. The posting lists remote work in the United States.

Senior Federal Technical Support Engineer at Horizon3

Horizon3

Diagnose cloud, networking and security issues for Horizon3 federal customers. Work across teams and use Linux, container and cloud knowledge to resolve difficult enterprise support cases. The posting lists remote work in the United States.

Senior Browser Automation Software Engineer at Horizon3

Horizon3

Build the browser automation and crawling engine for Horizon3 autonomous web pentesting. Improve navigation through modern SPAs, authentication and anti-bot challenges using Playwright and Stagehand while keeping tests production-safe. The posting lists remote work in the United States.

Web Application Offensive Security Engineer at Horizon3

Horizon3

Perform hands-on web application penetration tests and build reusable attack coverage in Horizon3 NodeZero. Analyze live testing gaps and help integrate AI-enhanced security techniques into production-safe autonomous assessments. The posting lists remote work in the United States.

Federal Backend Software Engineer at Horizon3

Horizon3

Develop backend product features for Horizon3 federal environments, including ETL data processing and GraphQL APIs for retrieval and interaction between services. This posting lists remote work in the United States.

Federal Attack Software Engineer at Horizon3

Horizon3

Develop offensive-security attack content and improve the data model behind Horizon3 NodeZero for federal deployments. Work with attack, data and federal engineering teams on product design and implementation. This posting lists remote work in the United States.

Staff AI and LLM Attack Engineer at Horizon3

Horizon3

Research attacks against AI and agentic systems and turn findings into repeatable modules for Horizon3 NodeZero autonomous pentesting. Work on prompt injection, tool-use abuse and defense evasion. The posting lists remote work in the United States.

Senior Backend Integration Engineer at Horizon3

Horizon3

Build APIs and integration foundations for Horizon3 NodeZero so customers can connect security data and create agentic workflows. Work on scalable backend systems with the Platform Integration team. The posting lists remote work in the United States.

Principal Database Platform Engineer at Horizon3

Horizon3

Lead database architecture for NodeZero’s multi-tenant penetration-testing data platform.

Senior Data Ingestion Software Engineer at Horizon3

Horizon3

Build Go or Python pipelines that turn autonomous penetration-test output into structured NodeZero data.