Senior Backend Engineer, Licensing

Get to Know Us Horizon3 is a fast-growing, remote cybersecurity company dedicated to the mission of enabling organizations to proactively find, fix and verify exploitable attack vectors before criminals exploit them. Our flagship product, the NodeZeroTM platform, delivers production-safe autonomous pentests and other key assessment operations that scale across the largest internal, external, cloud, and hybrid cloud environments. NodeZero has been adopted by organizations of all sizes, from small educational institutions to government agencies and Global 100 enterprises. It is used by IT Ops/SecOps teams, consulting pentesters, and MSSPs and MSPs. We are a fusion of former U.S. Special Operations cyber operators, startup engineers & operators, and formerly frustrated cybersecurity practitioners. We're committed to helping solve our common security problems: ineffective security tools and false positives, resulting in alert fatigue, blind spots, "checkbox” security culture, cybersecurity skills shortage, and the long lead time and expense of hiring outside consultants. Collectively, we are a team of learn it alls, committed to a culture of respect, collaboration, ownership, and results. What You’ll Do As a Senior Backend Engineer on the Licensing, Usage & Entitlements team, you’ll build the services that determine what NodeZero customers have purchased, which capabilities are enabled for them, and how usage limits apply. You’ll own meaningful work across product packaging, entitlements, and usage workflows for direct and partner accounts. Because these systems affect customer access and downstream product behavior, you’ll focus on correctness, clear service contracts, and reliable operation. You’ll collaborate with Product and adjacent engineering teams to resolve edge cases and deliver changes safely to production. Responsibilities - Design, build, and maintain services and APIs that represent customer purchases, product packaging, enabled capabilities, and usage limits. - Own features from technical design through implementation, testing, rollout, and production operation, with attention to data correctness and customer impact. - Build and evolve entitlement and usage workflows that work consistently across direct and MSP/MSPP account models. - Partner with Product and adjacent teams to define interfaces and resolve edge cases in licensing, packaging, and feature access. - Improve tests, observability, design documentation, runbooks, and support playbooks for business-critical services. - Investigate production issues across service boundaries and implement durable fixes. - Review code and design proposals and share context with other engineers. What You’ll Bring - Strong ownership and judgment when working on customer-impacting workflows where correctness matters. - Ability to reason through edge cases and communicate implementation risks and tradeoffs clearly. - A quality-minded approach to testing, data integrity, production support, and technical documentation. - Effective collaboration with Product and engineering partners; willingness to share knowledge and support teammates. - Ability to manage concurrent work while keeping stakeholders informed. Required Education / Experience - Bachelor’s degree in Computer Science, Computer Engineering, or a related field, or equivalent practical experience. - 7+ years of professional software engineering experience building and operating backend software. - Experience with a modern backend language such as Python, Go, Java, or TypeScript. - Experience designing APIs and data models for business-critical services or customer-facing workflows. - Strong SQL and relational database experience, including data integrity and production troubles