Senior Backend Engineer, Integrations

The role

You will join the Platform Integration Team to build and operate systems that connect the NodeZero platform to security and IT tools. You will evolve GraphQL APIs, build an Integration Router, and expand MCP platform capabilities.

What you will do

• Design and implement backend APIs in GraphQL
• Build and extend the Integration Router including connector libraries and Kafka-triggered services
• Own production reliability for API and integration services
• Contribute to the MCP platform and OAuth proxy layer
• Contribute production code that sets standards for design and quality
• Collaborate with frontend engineers, product managers, and security-domain teams
• Mentor junior and mid-level engineers

Required qualifications

• 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

Nice to have

• 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
• 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
• Experience integrating with third-party security or IT platforms
• 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

Benefits

• Equity package in the form of stock options
• Health, vision & dental insurance for you and your family
• Flexible vacation policy
• Generous parental leave

About the company

Horizon3 is a fast-growing, remote cybersecurity company dedicated to enabling organizations to proactively find and fix exploitable attack vectors. Their flagship product, NodeZero, delivers autonomous pentests across various cloud environments.