Back End Engineer, Horizon3

• Bachelor’s degree in Computer Science, Computer Engineering, or a related field, or equivalent practical experience
• 1–4 years of professional software engineering experience
• Experience building backend services using at least one modern language, such as Python, Go, Java, TypeScript, or similar
• Experience working with SQL and at least one relational database in production
• Experience building backend services on a cloud platform (AWS, GCP, or Azure), and familiarity with Docker and containerized applications
• Ownership mindset at the feature/component level:
• You can take a scoped project from design discussion through implementation, testing, and rollout with guidance
• You’re comfortable asking for help early when requirements or tradeoffs are unclear
• Strong collaboration skills:
• Clear, concise written and verbal communication
• Ability to work effectively with designers, frontend engineers, product, and customer-facing teams
• Growth and learning orientation:
• Curiosity about how distributed systems, ETL pipelines, and APIs come together to support a complex SaaS product
• Willingness to learn from senior engineers and to work in areas that might be new to you (e.g., graph databases, large-scale ETL, or advanced observability)
• Attention to quality:
• You care about testing, clear documentation, and building systems that are debuggable and observable in production
• You’re comfortable iterating quickly while still keeping reliability in mind

Desirable

• We’re looking for a Backend Engineer to join our Application Platform Team (APT). APT owns cross-cutting platform features for the Horizon3.ai engineering team, and has a mandate to build out a world-class application platform which is reliable, scalable, and performant
• As a Backend Engineer, you’ll help build and improve the backend systems and APIs that power NodeZero’s production-scale pentesting and reporting
• You’ll work alongside experienced engineers to implement features, improve stability and performance, and make it easier for other Horizon3 teams to build on the platform
• This description reflects a mid level role: you’ll have meaningful ownership of components and projects, with strong mentorship and support from senior engineers and managers
• Build and enhance backend services that power NodeZero, with a focus on:
• ETL jobs and data pipelines used to process and analyze large graph and relational datasets
• GraphQL APIs used by customer-facing features and internal tools (such as authentication, our internal management portal, reporting flows, and more)
• Improving the entrypoint to NodeZero, ensuring NodeZero runs seamlessly on various operating systems and provides improved observability into customer faced issues on installation process
• Implement and evolve backend APIs in GraphQL and Python to support:
• Internal tools that enable managing customer accounts and operations at scale
• Product features that rely on reliable, performant data access
• Help build foundational integrations platform
• Be involved in a new initiative to help scale Horizon3’s ability to integrate a large number of new partners
• Help improve developer experience and API quality and operational readiness to ensure partner integrations are seamless
• Collaborate closely with other teams:
• Partner with product, frontend, and other engineering squads to ship user-facing improvements
• Work with on-call and support engineers to debug production issues and improve reliability
• Contribute to platform performance and stability, including:
• Improving ETL and post-ETL performance around attack vectors and large customer environments
• Enhancing observability and monitoring for runner queues, ETL jobs, and core APIs
• Attack vector and asset graph processing
• Platform features like runner queues, customer entitlements, and client migrations
• Participate in code reviews, testing, and documentation, helping raise the quality bar across the team