Staff Software Engineer, Defensive Agent

Horizon3.ai
United States
Workplace: RemoteFull timeUSD 229,000 - 270,000 annuallyFunction: Software EngineeringExperience: 7+ yearsEducation: bachelorsSkills: ["Mentorship","Collaboration","Ownership","Technical leadership","Risk communication"]

Lead technical work for NodeZero’s defensive agents, translating proven attack paths into continuous, actionable remediation. Partner with AI researchers to shape agent reasoning while building the platform capabilities that make autonomous remediation a core product outcome. Provide hands-on technical leadership through architecture, design reviews, mentorship, and production code, partnering closely with Product to sequence priorities and ship durable multi-tenant systems.

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FursaFursa
Horizon3.ai
Horizon3.ai
2 days ago

Staff Software Engineer, Defensive Agent

✓ Verified Job

Canonical indexed version, validated from employer's careers page.

Source: Company careers pageValidated by: Fursa AI
Last checked: 13 hours agoStatus: Live

Job Summary

Lead technical work for NodeZero’s defensive agents, translating proven attack paths into continuous, actionable remediation. Partner with AI researchers to shape agent reasoning while building the platform capabilities that make autonomous remediation a core product outcome. Provide hands-on technical leadership through architecture, design reviews, mentorship, and production code, partnering closely with Product to sequence priorities and ship durable multi-tenant systems.
Location: United States
Workplace: Remote
Employment Type: Full time
Job Function: Software Engineering
Seniority: Mid level

Key Responsibilities

  • •Own the end-to-end technical vision for the workstream, from initial design through shipping, iterating, and deprecating.
  • •Contribute production code at lead/staff level in a modern backend language in a service-oriented environment.
  • •Set and raise the technical bar through architecture, design reviews, operational discipline, and mentoring frameworks.
  • •Translate ambiguous product goals into concrete technical roadmaps, partnering with PM on PRD reviews and sequencing MVP work.
  • •Design durable execution for long-running, resumable agent runs, including multi-tenant isolation, authorization/permission layers, and connector frameworks for third-party security control APIs.

Pay and Benefits

Salary: USD 229,000 - 270,000 annually
Equity and Bonus:Equity
Perks:Health InsuranceVisionDentalPaid LeaveParental Leave

Key Requirements

  • •Bachelor’s degree in Computer Science, Computer Engineering, or a related field.
  • •7+ years of professional software engineering experience using modern object-oriented or functional languages (e.g., Python, Go, Scala, C++, TypeScript).
  • •Experience building applications on cloud platforms such as AWS, Azure, or GCP, using Docker and Kubernetes.
  • •Deep, production experience with agentic or LLM-backed systems, including understanding failures and containment.
  • •Expert proficiency in SQL and demonstrated experience designing and operating distributed systems (async workflows, queues, retries, idempotency, partial failure).
Experience:7+ yearsCybersecurityLLM-backed systemsAgentic systemsCloudDistributed systemsMulti-tenant platforms
Education:Bachelor's in Computer Science or Computer Engineering (or related field)
Skills:MentorshipCollaborationOwnershipTechnical leadershipRisk communication
Tech Stack:PythonGoRustScalaC++TypeScriptSQLAWSAzureGCPDockerKubernetesTemporalPostgreSQLNeo4jGraphQLCrowdStrikeSentinelOneMicrosoft DefenderEDR

Company Brief

Horizon3.ai
Builds NodeZero®, an autonomous penetration-testing platform that continuously finds, prioritizes, and verifies exploitable vulnerabilities across on-premises, cloud, and hybrid environments to help organizations reduce security risk.
Industry: Cybersecurity
Company Size: Large (251 to 1,000 employees)
Growth: Scaleup
Funding: Series D
Headquarters: San Francisco, United States
Founded: 2019
Glassdoor
Glassdoor: 4.9
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