Senior Backend Engineer, Firewall at horizon3ai · LumiJobs

Responsibilities

We're hiring a Senior Firewall Engineer to be the blue team voice inside the Firewall team. You'll sit between Product and Engineering as the person who defines what "correct" means. When an attack technique is detected, you decide what remediation that claim requires. Your judgment becomes the ground truth.
This is not a coding role and it is not a product management role. Product owns the roadmap, Engineering owns the implementation, and our AI researchers own how the agents reason. You own the domain truth all three depend on, and you make it concrete enough to build and measure against. If you've spent your career being the person in the room who knows how the tools really behave, this is a seat where that knowledge teaches a system instead of firefighting alerts.
PRODUCT DIRECTION & REQUIREMENTS
Partner with Product to turn firewall effectiveness and tuning ambitions into concrete, buildable requirements.
Translate blue team workflows and pain into prioritized product outcomes, and push back when a proposed feature or agent behavior would not hold up in a real SOC.
Define acceptance criteria for detection, effectiveness, and tuning features, and validate releases against them before customers see them.
Serve as the standing domain reference for Engineering and AI research: available for design reviews, technique questions, and vendor behavior questions.
FIREWALL & NETWORK POLICY DOMAIN EXPERTISE
Own deep, current knowledge of major firewall platforms (i.e. AWS WAF, Palo Alto PAN-OS, Fortinet FortiOS, Cisco Secure Firewall, and Check Point Quantum) at the management console, policy/configuration, traffic and logging, and API levels.
Maintain fluency in how policy evaluation and enforcement work in each product, including rule order, zones, objects, NAT, security profiles, exceptions, and differences between default and hardened configurations.
Define vendor-specific policy semantics so a recommended rule or configuration change has equivalent intent across platforms that model policies differently.
Track platform releases, policy and API changes, new inspection and threat-prevention capabilities, and vendor guidance; keep our supported coverage model current as vendors ship.

Senior Backend Engineer, Firewall

Responsibilities

Benefits

Company

horizon3ai

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