225K–265K USD / year
Staff Software Engineer, Firewall
BackendRemote — United States
Published on 2026-10-30
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About this role
Lead the technical direction and hands-on development of Horizon3’s Web Application Firewall workstream within Precision Defense. Build integrations that assess WAF coverage and turn validated attack-path findings into accurate, safe remediation guidance.
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, Firewall pod
Stack
PythonGoRustAWS WAFCloudflareF5ImpervaFortiWeb
What you'll do
- Own the WAF workstream’s technical approach from design through delivery and operation.
- Build reliable integrations with WAF platforms and account for vendor-specific policy behavior.
- Develop correctness checks and safe remediation guidance that preserve legitimate traffic.
- Design durable workflows with retries, idempotency, timeouts, and partial-failure handling.
- Add authorization, audit, validation, rollout, and recovery controls for configuration changes.
- Improve observability and contribute production code, reviews, architecture, and mentorship.
What we're looking for
- Expert-level proficiency in large-scale Python development.
- 8+ years leading technical work at Staff, Lead, or comparable scope.
- Working knowledge of WAF platforms, rules, managed rule groups, and request inspection behavior.
- Proficiency in Go, Rust, or a comparable backend language.
- Experience designing service-oriented systems, APIs, or integrations for reliability and partial failure.
- Strong systems-design, security, communication, and cross-functional leadership skills.
Nice to have
- Experience with API security, bot management, rate limiting, application security testing, or network firewalls.
- Experience integrating vendor-specific security or infrastructure platforms.
- Experience building security products that assess control coverage or validate attack paths.
- Experience with safe automation, cloud environments, containerization, or services at scale.
- Experience partnering with Product, applied research, or security practitioners.
Benefits
- Stock options
- Health, vision, and dental insurance for employees and family
- Flexible vacation policy
- Generous parental leave