Senior Full-Stack Engineer, Autonomous Defense

🔥 15 hours ago

🇺🇸 United States – Remote

💵 $195k - $235k / year

⏰ Full Time

🟠 Senior

🧑‍💻 Full-stack Engineer

👻 Ghost score 20%

What it means: the chance that no one is really hiring for this job.How to read it: 60% or higher means we think this is a ghost. Lower scores are less of a worry.How we score it: age, reposts, open roles vs team size, how fast jobs close, and whether pay is listed.Fine print: an estimate from public data, not a judgment of the company. Real jobs can score high, so treat it as a hint, not a fact.

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Horizon3.ai

WebsiteLinkedInAll Job Openings

51 - 200 employees

Founded 2019

🔒 Cybersecurity

🤖 Artificial Intelligence

☁️ SaaS

Cybersecurity • Artificial Intelligence • SaaS

Horizon3. ai is a cybersecurity company that specializes in autonomous penetration testing through its platform, NodeZero. The company's mission is to proactively identify and address attack vectors before they can be exploited, allowing organizations to continuously assess their security posture across various environments including cloud, IoT, and on-premises systems. Founded by veterans from the US Special Operations and National Security sectors, Horizon3. ai offers a self-service SaaS solution that provides organizations with insights into their security vulnerabilities without requiring persistent or credentialed agents.

📋 Description

• Build and own the agent execution runtime with durable, resumable, long-running workflows, checkpointing, idempotent steps, cancellation, and timeouts • Design and implement the agent tool layer with registry versioning, schema validation, per-tenant enablement, and server-side authorization • Build the connector framework for third-party security control planes, including EDR, firewall, identity, SIEM, and cloud IAM • Implement the safe-change pipeline with dry runs, simulation, blast-radius classification, approval gates, staged rollout, rollback, and immutable per-tenant audit trails • Build the operator-facing React and TypeScript front end • Build client-side data and streaming layers using WebSockets rather than polling • Extend tenant isolation for write-capable agents, including execution boundaries, egress control, quotas, and prevention of cross-tenant leakage • Develop ETL and GraphQL product features for data processing and retrieval • Build ETL pipelines that convert pentest and remediation outcomes into training and evaluation datasets • Instrument systems with distributed tracing, per-tenant cost and token accounting, and tooling to explain agent decisions • Partner with AI researchers, attack engineers, and product to move capabilities from prototype to production

🎯 Requirements

• Bachelor's Degree in Computer Science, Computer Engineering or related field • 7+ years of professional software engineering experience using modern object-oriented or functional languages such as Python, Go, Scala, C++, or TypeScript • Proven experience delivering backend APIs, especially GraphQL, and consuming them from a modern web stack • Production experience with React, TypeScript, and modern CSS layout • Experience building applications on AWS, Azure, or GCP • Experience using Docker and Kubernetes • Expert proficiency in SQL • Demonstrated experience designing and operating distributed systems in production, including asynchronous workflows, queues, retries, idempotency, and partial failure • Track record of shipping and operating production services, including on-call ownership • Experience building agentic or LLM-backed systems in production • Experience with durable execution or workflow engines such as Temporal, or equivalent checkpointing experience • Experience building multi-tenant platforms with hard isolation requirements, workload identity, and short-lived credential brokering • Experience integrating third-party APIs behind a normalized abstraction • Familiarity with security control planes and APIs, including EDR, firewalls, SIEM, and cloud IAM • Experience with PostgreSQL and Neo4j database architectures and GraphQL backends • Experience with React Query or Apollo, GraphQL subscriptions, and WebSockets • Experience building operator-facing or admin interfaces where density, auditability, and safe destructive actions matter • Experience with Datadog, Prometheus, Grafana, and distributed tracing • Awareness of prompt injection and untrusted-input handling • Willingness to travel up to 5% • Authorization to work in the United States is requested in the application form

🏖️ Benefits

• Equity package in the form of stock options for all full-time roles • Health insurance for you and your family • Vision insurance for you and your family • Dental insurance for you and your family • Flexible vacation policy • Generous parental leave • Career development opportunities • Inclusive and collaborative work environment • Remote work

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