# Senior Machine Learning Engineer, Autonomous Defense at Horizon3.ai

- Company: Horizon3.ai
- What the company does: Horizon3 uses real-world attacks to safely show what attackers can actually do in your environment—so you can fix and prove what matters. Backed by NEA.
- Company website: https://horizon3.ai/
- Type: Startups (AI role)
- Level: Senior
- Location: US, Remote
- Work setup: Remote
- Pay: $211K to $249K base salary per year (USD)
- Posted: 2026-09-14
- Apply by: 2026-10-29
- Apply: https://jobs.ashbyhq.com/horizon3ai/d29ee5f3-2b4f-416f-8771-7c419e7db974
- Page: https://www.1752.vc/careers/jobs/horizon3-ai-senior-machine-learning-engineer-autonomous-defense/

## About the role

As a Senior Machine Learning Engineer on the Defensive Agent team, you'll be the person who gets our defensive models into production and keeps them there. Our AI researchers define how NodeZero's agents should reason. You build the pipelines, serve infrastructure, and release machinery that turns that research into something running against thousands of customer tenants every day.

## What they're looking for

- Bachelor's Degree in Computer Science, Computer Engineering or related field, or equivalent practical experience
- 5+ yrs professional software engineering experience, with strong production Python
- Demonstrated experience taking ML or LLM-backed systems from prototype to production and operating them
- Hands-on experience with ML pipelines and tooling: training or fine-tuning workflows, experiment tracking, artifact and model registries, and reproducible data preparation
- Experience building and operating inference or model-serving infrastructure in production, including latency and cost optimization
- Experience building applications on cloud computing platforms such as AWS, Azure, GCP, using container technologies such as Docker and Kubernetes

Tags: Engineering