Senior Software Engineer - Remote Cybersecurity Innovator

Horizon3 AI, Inc.; Chicago, Northern (IL, KY); Hybrid; USD 169,000 - 208,000; Full time

Benefits offered by this job

Health insurance

Vision insurance

Dental insurance

Flexible vacation

Parental leave

Equity options

Job summary

Horizon3 AI, Inc. is a remote-first cybersecurity company seeking engineers to build scalable attack-vector discovery and automated crawls across client environments. You’ll work on NodeZero platform components and collaborate with a global team to deliver production-safe solutions.

You’ll tackle complex web app security challenges, improve crawl coverage, and balance deterministic automation with AI-powered navigation while maintaining performance and reliability.

Qualifications

• Experience in web app security or offensive tooling.
• Familiarity with graph data models (e.g., Neo4j).
• Experience with large-scale crawling and endpoint discovery.
• Experience with session/credential management for automated access.

Responsibilities

• Tackle complex web app challenges: SPA routing, authentication flows, multi-step forms, file uploads, WebSocket/Socket.IO, infinite scroll, and crawler traps.
• Improve crawl coverage, determinism, and throughput with endpoint discovery, dedupe, queueing, and state management.
• Balance deterministic automation with selective LLM-driven navigation for speed and debuggability.
• Collaborate with attack-team engineers to map crawl outputs to the application graph.
• Own critical subsystems and scale them to production environments.

Skills

Web app security

Offensive tooling

Graph data models

Crawling experience

Endpoint discovery

Session management

Tools

Neo4j

Job description

Horizon3 AI, Inc. is a remote-first cybersecurity company seeking engineers to build scalable attack-vector discovery and automated crawls across client environments. You’ll work on NodeZero platform components and collaborate with a global team to deliver production-safe solutions.

You’ll tackle complex web app security challenges, improve crawl coverage, and balance deterministic automation with AI-powered navigation while maintaining performance and reliability.