Staff Software Engineer, OTA Services

Get to Know Us Horizon3 http://Horizon3.ai 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 NodeZero™ 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. As a remote first company, we require minimum 25Mbps consumer grade broadband connection.   What You'll Do The Expert Engineer on the OTA Services team is the technical anchor for how NodeZero updates itself across thousands of customer deployments — without customer intervention, without downtime, and without introducing new vulnerabilities in the process. NodeZero runs as a container inside customer infrastructure. When a new image is ready, the OTA system has to find every deployed instance, negotiate the update, deliver it safely, validate it, and roll back gracefully if something goes wrong. Getting that right at scale, across diverse customer environments including air-gapped and restricted networks, is a genuinely hard systems problem. This is a hands-on staff-level role. You will write production code, produce architecture designs, set the technical direction for update delivery and version management, and mentor P4 engineers on the team. The OTA Services team works in close partnership with the Image Build & Release team — your counterpart on the build side produces the artifacts you deliver. This role reports to the Client Platform Engineering Manager. Responsibilities - OTA Architecture: Design and own the over-the-air update system — the delivery protocol, version negotiation, rollout orchestration, health verification, and automatic rollback - Deployment Fleet Management: Own the systems that track the version state of every NodeZero deployment — know what's running where, what's pending, and what's stuck - Rollout Strategy: Design safe rollout strategies for updates — phased rollouts, canary deployments, customer pinning, and emergency hold mechanisms - Constrained Environment Delivery: Design delivery mechanisms that work reliably across diverse customer environments including air-gapped networks, strict egress policies, and minimal-footprint deployments - Reliability & Incident Response: Own OTA system reliability end-to-end — on-call for delivery failures, stuck updates, and version drift incidents - Mentorship: Mentor P4 engineers through design review, code review, and technical pairing; be the person the team turns to when delivery semantics get complicated   What You'll Bring Distributed Systems & Delivery - 8+ years of professional software engineering experience with deep specialization in distributed systems, remote update systems, or fleet management infrastructure - Deep understanding of remote update system design — delivery protocols, version negotiation, delta delivery, healt