Senior Backend Engineer, Horizon3

• Ability to own and manage concurrent initiatives, with strong judgment in prioritization and time management
• Self-directed and driven — capable of conceiving and implementing solutions independently and as part of a team
• A strong desire to continuously learn new technologies in a fast-paced Agile environment
• Excellent analytical and problem-solving skills, with attention to detail and a high bar for quality
• Strong technical documentation ability to support an external developer audience
• Effective communication and collaboration across engineering, product, and design
• Interest in mentoring junior and mid-level engineers as the team grows
• 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 (Python, Go, TypeScript, Java, Scala, C++, etc.)
• Experience building production applications on cloud platforms (AWS, Azure, GCP) using Docker and Kubernetes

Desirable

• You'll be joining the Platform Integration Team (PIT Crew) — a high-impact group whose mandate is critical to the scalability and extensibility of the NodeZero platform. The PIT Crew's mission is to transform Horizon3's APIs and integrations from a collection of one-off vendor connectors into a consistent, documented, permission-aware platform. You'll build the systems that let customers connect NodeZero to the tools they already rely on across the security and IT ecosystem
• This is a senior individual contributor role. You'll lead through technical judgment, cross-functional partnership, and high-quality execution — owning significant pieces of platform infrastructure while helping set the standard for the team
• API Platform: evolving our internal GraphQL-federated API into a first-class, customer-facing product — with permissions, multi-account scoping, versioning, schema evolution, and documentation
• Integration Platform: building and operating a shared Integration Router so new connectors can be configured and declared rather than built from scratch, with reusable authentication, health checks, and workflow execution
• Security-Tool Integrations: shipping and maintaining integrations with the tools customers already use — CrowdStrike, Splunk, ServiceNow, Jira, Palo Alto, SentinelOne, and others in the SIEM, EDR, and ticketing ecosystem
• MCP Platform: expanding our customer-facing MCP server and agentic workflow capabilities across US, EU, and Australia production environments, enabling customers to build their own AI-powered workflows atop NodeZero data
• You'll also share on-call responsibility for a substantial production-observability footprint (Datadog, Kafka-triggered services, multiple environments), meaning you're not just shipping integrations — you're operating them
• 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
• Contribute production code that sets the standard for design quality, code quality, and operational rigor
• Collaborate with frontend engineers, product managers, and security-domain teams (particularly the Pentest Data Platform) to deliver integrated customer experiences
• Mentor junior and mid-level engineers on the team as it scales