175K–230K USD / year
Senior Firewall Engineer, Autonomous Defense
OtherRemote — United States
Published on 2026-10-29
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About this role
Define the domain standards for firewall detection, effectiveness, and tuning recommendations in Horizon3’s autonomous defense platform. This practitioner-focused role connects Product, Engineering, and AI research, ensuring recommendations reflect real firewall behavior and SOC workflows.
About the company
Horizon3.ai is a technology company specializing in cybersecurity solutions, focusing on automated penetration testing and threat detection for enterprises. They provide a range of services aimed at enhancing security posture and risk management for organizations across various sectors.
The team
Precision Defense and CAIR
Stack
AWS WAFPalo Alto PAN-OSFortinet FortiOSCisco Secure FirewallCheck Point QuantumPythonSQL
What you'll do
- Turn firewall effectiveness and tuning goals into buildable requirements and acceptance criteria.
- Validate detection, tuning, and remediation features against real SOC workflows.
- Define vendor-specific policy semantics and equivalent remediation intent across platforms.
- Maintain current knowledge of firewall platform policies, APIs, releases, and capabilities.
- Evaluate whether tuning recommendations block validated attack paths while preserving legitimate traffic.
- Partner with the Attack team to ground coverage and remediation in adversary behavior.
What we're looking for
- 6+ years in firewall engineering, network security, security operations, incident response, or threat hunting.
- Hands-on production administration and tuning of enterprise firewalls, including rulebases, NAT, segmentation, and policy exceptions.
- Strong understanding of firewall logs, SOC investigations, policy effectiveness, and false-positive and false-negative tradeoffs.
- Knowledge of MITRE ATT&CK, network-control coverage, and post-compromise attacker behavior.
- Experience shaping a security product or platform as a domain expert and influencing without authority.
- Excellent technical writing and ability to communicate across technical and business audiences.
- Working ability with Python, APIs, telemetry analysis, and SQL.
Benefits
- Stock options
- Flexible vacation policy
- Generous parental leave
- Health, vision, and dental insurance for employees and families