Software Engineer, API Platform

🕒 October 8

🇺🇸 United States – Remote

💵 $148.8k - $190k / year

⏰ Full Time

🟢 Junior

🟡 Mid-level

🔙 Backend Engineer

🚫👨‍🎓 No degree required

👻 Ghost score 20%

What it means: how likely this posting is sitting open without active hiring.How to read it: 60% or higher means we think this is a ghost. Lower scores are less of a worry.How we score it: age, reposts, open roles vs team size, how fast jobs close, and whether pay is listed.Fine print: an estimate from public data, not a judgment of the company. Real jobs can score high, so treat it as a hint, not a fact.

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Horizon3.ai

WebsiteLinkedInAll Job Openings

51 - 200 employees

Founded 2019

🔒 Cybersecurity

🤖 Artificial Intelligence

☁️ SaaS

Cybersecurity • Artificial Intelligence • SaaS

Horizon3. ai is a cybersecurity company that specializes in autonomous penetration testing through its platform, NodeZero. The company's mission is to proactively identify and address attack vectors before they can be exploited, allowing organizations to continuously assess their security posture across various environments including cloud, IoT, and on-premises systems. Founded by veterans from the US Special Operations and National Security sectors, Horizon3. ai offers a self-service SaaS solution that provides organizations with insights into their security vulnerabilities without requiring persistent or credentialed agents.

📋 Description

• Implement and maintain API endpoints, middleware, and platform services in Go • Build and evolve the API gateway layer, including routing, authentication, rate limiting, and request/response shaping • Write and maintain API contracts using OpenAPI and gRPC definitions • Communicate breaking API changes to internal consumers • Contribute to service reliability through monitoring, alerting, SLA tracking, and incident response for platform APIs • Write clear, reviewable code with tests covering happy paths and failure modes • Collaborate with Data Ingestion, Integrations Platform, and Client Platform teams • Help build the internal API layer connecting NodeZero services and powering customer and integration interfaces • Work on API consolidation, versioning, rate limiting, and observability • Report to the API Platform Engineering Manager

🎯 Requirements

• 2+ years of professional software engineering experience building production backend services • Proficiency in Go or strong motivation to ramp quickly; Go is the primary language • Solid understanding of REST API design principles and HTTP semantics • Ability to reason about latency, error rates, retry behavior, and circuit breaking • Comfort working in Kubernetes-based environments, including deploying, debugging, and understanding service interactions • Experience with containerized development workflows using Docker • Familiarity with OAuth 2.0, API keys, and JWT authentication patterns • Ability to write clear, reviewable code with meaningful tests • Ability to communicate blockers early and ask for help • Comfortable working asynchronously across a distributed team • Experience with gRPC is a plus • Experience with API gateway technologies such as Kong, Envoy, NGINX, or cloud-native equivalents is a plus • Exposure to service mesh architectures such as Istio or Linkerd is a plus • Background in cybersecurity or experience building APIs consumed by security tools is a plus • Experience with gRPC and protobuf-defined service contracts is a plus • Legally authorized to work in the United States • Up to 5% travel may be required

🏖️ Benefits

• Stock options/equity package for all full-time roles • Health insurance for employees and family • Vision insurance for employees and family • Dental insurance for employees and family • Flexible vacation policy • Generous parental leave • Career development opportunities • Inclusive and collaborative culture • Remote and hybrid work models depending on role and location