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Horizon3.ai
Horizon3.ai
51 – 200 Employees
Artificial IntelligenceCybersecuritySaaS
Horizon3.ai is a cybersecurity and artificial intelligence company founded in 2019 that develops autonomous penetration testing software. Its NodeZero platform helps organizations continuously evaluate their security posture by identifying exploitable attack paths across cloud, IoT, and on-premises environments. Designed as a self-service SaaS solution, NodeZero provides vulnerability insights without requiring persistent or credentialed agents. Horizon3.ai was founded by veterans of the US Special Operations and National Security sectors and focuses on helping security teams proactively address weaknesses before attackers can exploit them.
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Software Engineer, API Platform at Horizon3.ai (Remote - United States)

Build Go-based API infrastructure for Horizon3.ai’s NodeZero autonomous cybersecurity platform. Own gateways, service contracts, reliability tooling, and shared APIs that support security integrations.

USUnited States
$148,750 – $190,000 / year
RemoteFull-timeJuniorMiddleNo degree requiredEnglish RequiredBackend EngineerSoftware Engineer
CloudCyber SecurityDockerGoGRPCKubernetesNGINX

Description

  • Develop and maintain Go API endpoints, middleware, and platform services
  • Expand the API gateway with routing, authentication, rate limiting, and request/response transformation
  • Define and maintain API contracts with OpenAPI and gRPC
  • Notify internal consumers about breaking API changes
  • Improve platform API reliability through monitoring, alerting, SLA tracking, and incident response
  • Produce readable, reviewable code with tests for successful and failure scenarios
  • Partner with the Data Ingestion, Integrations Platform, and Client Platform teams
  • Develop the internal API layer linking NodeZero services with customer and integration interfaces
  • Contribute to API consolidation, versioning, rate limiting, and observability initiatives
  • Report to the API Platform Engineering Manager

Requirements

  • At least two years of professional experience developing production backend services
  • Proficiency in Go, or a strong ability and willingness to become productive quickly; Go is the primary language
  • Strong understanding of REST API design and HTTP semantics
  • Ability to evaluate latency, error rates, retry behavior, and circuit-breaking strategies
  • Experience working in Kubernetes environments, including deployment, debugging, and service interaction analysis
  • Experience with Docker-based containerized development workflows
  • Familiarity with OAuth 2.0, API key, and JWT authentication patterns
  • Ability to write clear, reviewable code supported by meaningful tests
  • Willingness to raise blockers early and seek assistance when needed
  • Comfort working asynchronously with a distributed team
  • Experience with gRPC is beneficial
  • Experience with API gateways such as Kong, Envoy, NGINX, or comparable cloud-native technologies is beneficial
  • Exposure to service mesh platforms such as Istio or Linkerd is beneficial
  • Cybersecurity experience or experience developing APIs used by security tools is beneficial
  • Experience with gRPC and protobuf-based service contracts is beneficial
  • Legally authorized to work in the United States
  • Willingness to travel up to 5% if required

Benefits

  • Stock options or an equity package for every full-time employee
  • Health insurance covering employees and their families
  • Vision insurance covering employees and their families
  • Dental insurance covering employees and their families
  • Flexible vacation policy
  • Generous parental leave
  • Professional and career development opportunities
  • Inclusive, collaborative workplace culture
  • Remote and hybrid work arrangements based on the role and location

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