Senior Engineer, Full Stack - Pentest Experience

Get to Know Us Horizon3 is a fast-growing, remote cybersecurity company dedicated to the mission of enabling organizations to proactively find and 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 ITOps/SecOps teams, consulting pentesters, and MSSPs and MSPs.  We are a fusion of former U.S. Special Operations cyber operators, startup engineers, and formerly frustrated cybersecurity practitioners. We're committed to helping solve our common security problems: ineffective security tools, 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 We are hiring Senior Full Stack Engineers to join our team and help build product experiences that enable customers to understand, prioritize, and act on risk in their environments. This role is for a strong senior engineer who can own meaningful product work end-to-end across both backend and frontend systems, partnering closely with Product, Design, and peer engineers to deliver outstanding customer-facing outcomes. The right candidate will be comfortable moving between backend services and modern frontend application development. This role will be approximately 80% backend focused and 20% frontend focused. You should be able to scope and drive work independently, proactively identify risks and tradeoffs, and help raise the bar for the engineers around them through strong execution, code reviews, and collaborative problem solving. What You’ll Be Responsible For - Build and ship world-class product capabilities spanning backend services, APIs, and modern web application interfaces. - Own moderate-to-large projects end-to-end, including scoping, technical design, implementation, rollout, and iteration. - Help implement user-facing experiences that are clear, maintainable, performant, and aligned with product requirements and design direction. - Partner closely with Product, Design, and adjacent engineering teams to deliver cross-functional initiatives. - Proactively identify and resolve technical risks, blockers, and mis-scoped work before they become larger delivery issues. - Communicate technical topics clearly to both technical and non-technical audiences, including tradeoffs, delivery risks, and implementation choices. - Contribute to architectural and design discussions with a strong sense for maintainability, operability, and long-term team productivity. - Write high-quality code, tests, and technical documentation, and provide strong code reviews that improve the team’s overall output. - Support and mentor less experienced engineers through thoughtful feedback, onboarding support, and day-to-day collaboration. - Help improve engineering quality, team execution, and the product experience through a strong sense of ownership and continuous improvement. What You’ll Bring - Strong professional experience building and operating production software across both backend and frontend layers. - Experience developing backend services in one or more modern languages such as Go, Rust, Python, Java, TypeScript, or similar. - Experience building frontend applications with modern frameworks such as React, Angular, or si