Horizon3AI
Applied AI Engineer, Autonomous Defense
$313K–$369K
US, Remote · Remote · Full-time · Posted Sep 14, 2026
- Experience
- 4+ years of professional engineering experience.
- Education
- Master's in Computer Science, Machine Learning, or a related field, or equivalent practical experience.
About the job
Build autonomous AI agents that translate proven attack paths into safe security-control changes, apply or stage them, and verify effectiveness by rerunning attacks.
What you'll do
- Develop reasoning systems to map attack paths and telemetry to control changes, assessing effectiveness and operational blast radius.
- Create training and evaluation data from pentest results and run counterfactual experiments to test remediation effectiveness and generalization.
- Design cross-vendor control-plane reasoning and safety systems for autonomous changes, including simulation, approval gates, staged rollout, rollback, and audit trails.
What they ask for
- Production AI/ML engineering experience, including deep learning, transformer models, and PyTorch; plus experience with LLM post-training or agentic systems with tool use, planning, and long-horizon execution.
- Track record building outcome-based evaluation systems for open-ended tasks and reasoning over structured, heterogeneous real-world data.
- Production-quality Python software engineering experience, plus experience with data pipelines, distributed systems, and cloud infrastructure.
- Master's in Computer Science, Machine Learning, or related field, or equivalent practical experience; 4+ years of professional engineering experience.
Nice to have
- Background in detection engineering, purple teaming, security engineering, offensive security, or incident response.
- Experience with causal or counterfactual inference, graph reasoning, planning, or production write-action automation with safety and change-management controls.
Pay
$313,000 - $369,000 annually (base salary); stock options (additional compensation; no amount stated)
Tools
PyTorch, Python, AWS, Neo4j, CrowdStrike, SentinelOne, Defender, Palo Alto
AI focus
Build and evaluate autonomous agents that reason over attack evidence, recommend and execute security-control changes, and verify fixes through real attack reruns; includes safety architecture, training data, and counterfactual evaluation.
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