Senior Engineering Manager, MSSP

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 looking for an engineering leader to own and scale the MSP/MSSP team at Horizon3. This leader will drive the platform capabilities that make NodeZero scalable and operationally excellent for Managed Service Providers (MSPs) and Managed Security Service Providers (MSSPs) — enabling partners to deliver NodeZero as a managed service to their customers at scale. You will: Lead the MSP/MSSP Engineering Team - Build, mentor, and grow a team of backend and full-stack engineers focused on multi-tenant platform capabilities for MSP and MSSP partners. - Drive the platform strategy for MSP and MSSP use cases, including multi-tenancy, parent and sub-client relationships, tenant allocation, partner administration, client management dashboards, co-branding, and white-labeling. - Establish and evolve the architecture for account hierarchies, delegated administration, tenant isolation, and partner-specific entitlement and licensing flows. Drive Engineering Excellence - Use design reviews, code reviews, and blameless retrospectives to drive a culture of quality and engineering excellence. Partner with Product, Customer Success, Partnerships, and Sales to align the team's roadmap with partner needs. People Leadership and Project Management - Balance partner support and operational needs while executing on a roadmap of platform improvements and new MSP/MSSP capabilities. - Hire and directly manage software engineers focused on multi-tenant and partner platform systems. - As a Manager, you will be responsible for: - Recruiting and onboarding talented individuals to support our organizational goals - Mentoring, coaching, equipping, and developing your team - Recognizing and retaining high performers - Leading horizontally with peer Management & Senior Leaders What You’ll Bring (Qualifications) Building and Leading Platform Teams - Demonstrated experience leading engineering teams building and operating multi-tenant SaaS platforms at scale. - Strong technical background in multi-tenancy, account hierarchies, tenant isolation, delegated administration, and parent/sub-client models. - Experience with partner or channel software models — MSP, MSSP, OEM, white-label, reseller, or co-branded platforms. - Proven track record of taking complex platform capabilities from design through production and at-scale operation. - Strong working knowledge of at least one major cloud provider (AWS, GCP, or Azure). Experience with identity and access management, RBAC, authorization models, and enterprise acc