Note: The job is a remote job and is open to candidates in USA. Horizon3.ai is a remote cybersecurity company that develops the NodeZero platform for autonomous penetration testing and security assessment operations. The Senior Backend Engineer will design, implement, and operate backend services for licensing, entitlements, provisioning, administration, MSP/MSSP capabilities, auditability, and notifications across a multi-tenant platform.
Responsibilities
- Design and implement backend services that enforce licensing, entitlements, feature access, usage limits, and packaging rules consistently across NodeZero's product, APIs, and partner workflows
- Build and evolve provisioning and onboarding workflows - account setup, entitlement propagation, and auto-provisioning that reliably activates customers without manual intervention
- Develop admin experience infrastructure: user access controls, account settings, parent-child account relationships, and the RBAC/authorization patterns that make multi-tenant administration safe and auditable
- Build MSP/MSSP capabilities - asset allocation, sub-client management, usage visibility, and reporting workflows that let service providers manage multiple customer environments at scale
- Implement audit logging and event history systems that capture administrative, entitlement, usage, and account-level actions for support, compliance, and customer trust
- Develop the notifications platform: usage warnings, consumption alerts, overage notices, product announcements, and other transactional and non-transactional communications
- Operate these services in production - contributing to monitoring, runbooks, incident response, and support workflows for systems customers depend on daily
- Contribute production code that sets the standard for design quality, test coverage, observability, and operational rigor
- Collaborate with adjacent teams - Pentest Data Platform and the Platform Integration Team - to ensure entitlement, access, and account-hierarchy rules are applied consistently wherever NodeZero data is exposed
Skills
- 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 high attention to detail and a high bar for quality - particularly for systems where correctness has commercial and compliance implications
- Strong technical documentation ability, including design docs, runbooks, and support documentation
- Effective communication and collaboration across engineering, product, and design
- Interest in mentoring junior and mid-level engineers
- 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
- Experience building multi-tenant SaaS platforms with strong tenant isolation - particularly around access controls, data scoping, and account hierarchy
- Hands-on experience with RBAC, authorization, authentication, or SSO systems, and the patterns that make them consistent and auditable at scale
- Experience with licensing, subscription, entitlement, usage metering, or billing-adjacent systems - especially where correctness and consistency across services matter
- Experience designing and building audit log or event history systems with compliance or support requirements in mind
- Familiarity with provisioning and feature-access patterns - auto-provisioning, feature flags, and staged rollout for commercial SaaS products
- Experience building admin consoles or customer self-service workflows, including parent-child or multi-org account management
- Experience with MSP, MSSP, or multi-tenant partner models - asset allocation, sub-account management, and usage/reporting visibility
- Experience with notifications infrastructure - transactional and non-transactional communications, delivery reliability, and preference management
- Production reliability experience: observability tooling, on-call ownership, runbook authorship, and incident response for foundational platform services
- Expert proficiency in SQL and experience with relational database architectures (PostgreSQL); comfort with complex data models involving account hierarchies, usage records, and entitlement state
Benefits
- Inclusive culture where everyone can thrive.
- Numerous career development opportunities.
- A collaborative environment that encourages creativity and out-of-the-box thinking.
- Remote and hybrid work models depending on role and location.
- Equity package in the form of stock options for all full-time roles.
- Health, vision & dental insurance for you and your family.
- Flexible vacation policy.
- Generous parental leave.
Company Overview