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Salary: USD 170,000 - 235,000 / annual
Horizon3.ai is a fast-growing cybersecurity company building NodeZero, an autonomous pentest platform that helps organizations proactively find and fix exploitable attack vectors. The company is remote-first and founded by former U.S. Special Operations cyber operators and startup engineers.
You'll join the Platform Integration Team (PIT Crew), a high-impact group responsible for transforming Horizon3's APIs and integrations into a consistent, documented, permission-aware platform. This is a senior individual contributor role where you'll lead through technical judgment and high-quality execution, owning significant pieces of platform infrastructure while mentoring junior and mid-level engineers.
Key responsibilities:
- Design and implement backend APIs in GraphQL, including federated subgraph development, schema evolution, and multi-account query scoping for MSSP and multi-subsidiary customers
- Build and extend the Integration Router: connector libraries, workflow configuration, secrets management, vendor adapters, and Kafka-triggered dispatch services
- Own production reliability for API and integration services: monitoring, alerting, deployment, vendor API drift, rate limits, retries, and safe failure handling
- Contribute to the MCP platform and OAuth proxy layer, including tool authentication and agentic workflow support
- Produce code that sets the standard for design quality, code quality, and operational rigor
- Collaborate with frontend engineers, product managers, and security-domain teams to deliver integrated customer experiences
- Mentor junior and mid-level engineers as the team scales
- Share on-call responsibility for production observability (Datadog, Kafka-triggered services, multiple environments)
You'll work on integrations with industry-standard security and IT tools including CrowdStrike, Splunk, ServiceNow, Jira, Palo Alto, and SentinelOne across SIEM, EDR, and ticketing ecosystems.
REQUIREMENTS:
- Bachelor's Degree in Computer Science, Computer Engineering, or related field
- 7+ years of professional software engineering experience using modern object-oriented or functional languages (Python, Go, TypeScript, Java, Scala, C++, etc.)
- Experience building production applications on cloud platforms (AWS, Azure, GCP) using Docker and Kubernetes
DESIRABLE QUALIFICATIONS:
- Expert proficiency in SQL and experience with relational (PostgreSQL) and graph (Neo4j) database architectures
- Hands-on experience building GraphQL backends, including federated graph architectures and schema evolution patterns
- Experience designing and operating public API platforms with versioning, developer documentation, permission models, and multi-tenant access
- Experience building or operating an integrations platform with reusable connector patterns, event-driven workflows (Kafka or similar), and asynchronous execution
- Familiarity with OAuth/OIDC, service accounts, or machine identity patterns for programmatic API access
- Experience integrating with third-party security or IT platforms (SIEMs, EDR tools, ticketing systems, workflow automation)
- Experience with MCP, agentic frameworks, or other tool-protocol ecosystems
- Production reliability experience: observability tooling (Datadog or similar), on-call ownership, vendor API drift handling, and safe failure design
- Experience with customer-facing developer surfaces: CLI tooling, SDKs, or developer portals
