Senior Full-Stack Engineer, Autonomous Defense
Horizon3 AI12 hours ago
Remote, United StatesSenior
Base Salary
$195k - $235k/yr
Responsibilities
- Build and own a durable, resumable agent execution runtime with checkpointing, idempotency, cancellation, and timeouts.
- Design the versioned agent tool layer with schema validation, per-tenant enablement, and server-side authorization.
- Build connectors for third-party security control planes and implement simulation, approval, staged rollout, rollback, and immutable audit capabilities.
- Extend tenant isolation for write-capable agents, including execution boundaries, egress control, quotas, and cross-tenant leakage prevention.
- Build operator-facing React and TypeScript interfaces and client-side streaming data layers using WebSockets.
- Develop GraphQL and ETL features and pipelines for agent context, run history, remediation state, and research datasets.
- Instrument agent runs with distributed tracing, tenant-level cost and token accounting, and debugging tools.
- 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 a related field.
- 7+ years of professional software engineering experience using languages such as Python, Go, Scala, C++, or TypeScript.
- Proven experience delivering backend APIs, especially GraphQL, and consuming them from modern web stacks.
- Production experience with React, TypeScript, and modern CSS layout.
- Experience building applications on AWS, Azure, or GCP with Docker and Kubernetes.
- Expert proficiency in SQL.
- Experience designing and operating distributed systems involving asynchronous workflows, queues, retries, idempotency, and partial failure.
- Track record of shipping and operating production services, including on-call ownership.
- Preferred experience with agentic or LLM-backed systems, durable execution or workflow engines such as Temporal, and multi-tenant platforms with hard isolation requirements.
- Preferred experience integrating third-party APIs, security control planes, relational and graph databases, GraphQL backends, client-side streaming patterns, operator-facing interfaces, observability tools, and distributed tracing.
- Awareness of prompt injection and untrusted-input handling in agent systems.
Benefits
- Fully remote company with up to 5% travel required; remote and hybrid work models vary by role and location.
- Full-time roles are eligible for an equity package in the form of stock options.
- Health, vision, and dental insurance for employees and families.
- Flexible vacation policy and generous parental leave.
- Inclusive, collaborative culture with career development opportunities.
Tech Stack
AWSAzureC++CSSDatadogDockerGoGoogle Cloud PlatformGrafanaGraphQLKubernetesNeo4jPostgreSQLPrometheusPythonReactScalaSQLTypeScript
Categories
About Horizon3 AI
Horizon3 AI builds NodeZero, a proactive security platform that autonomously performs penetration testing and validates attack paths across on‑prem, cloud, and hybrid environments. The company sells its software by subscription to security and IT teams at enterprises and government agencies, helping prioritize and verify fixes. Founded in 2019 and headquartered in San Francisco, it is privately held and serves customers across regulated industries and the public sector.