Senior Customer Onboarding Engineer

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.   ROLE SUMMARY We are hiring a Customer Onboarding Engineer with 5+ years of hands-on enterprise experience. You will be the technical owner of a new customer’s first 30 days: taking the account from sales handoff to successful production deployment of the NodeZero platform. This role requires the same technical depth as a Senior Technical Support Engineer—cloud, Linux, networking, containers, identity, and security—but the primary work is time-boxed implementation for new customer onboarding. You will still diagnose hard problems, do root-cause analysis, and write the knowledge that Support needs. When bandwidth allows, you will assist the larger Horizon3 support team with standard support case management and resolution. You should be a self-directed engineer who can juggle multiple enterprise engagements with little supervision, working cross functionality with key internal and customer stakeholders to successfully deploy the NodeZero platform and ensure realized customer value. WHAT YOU WILL DO OWN THE ONBOARDING - Lead kickoff with the customer and internal account team. Confirm scope, environments, owners, identity/access path, compliance constraints, and go-live criteria. - Project-manage the 30-day plan. Track blockers (credentials, firewall changes, IdP claims, change windows). - Provide best practices expertise and assist in deployment and optimization of the customer environment. - Ensure successful production deployment against the customers initial testing goals as success criteria for the onboarding. TECHNICAL IMPLEMENTATION - Diagnose and resolve implementation failures across cloud infrastructure, networking, and security with the same rigor used on escalated support tickets. - Perform root-cause analysis on first-time integration and deployment issues so the same failure does not recur after handoff. - Work in Linux production environments: server configuration, performance tuning, security hardening, and troubleshooting. - Deploy and manage containerized workloads with Docker and orchestrated environments such as Kubernetes. - Provision and troubleshoot pentest configuration AWS, Azure, or GCP. - Assist in troubleshooting network issues that commonly block go-live: TCP/IP, firewalls, VPNs, load balancers, etc. - Configure and validate identity paths required for onboarding: RBAC, SSO (OAuth, SAML), and directory services (Active Directory, LDAP). - Apply NodeZero expertise in scoping and configuring initial tests. WORK ACROSS THE COMPANY - Collaborate with CS, Engineering, Product, and Sales to unblock