Senior Engineering Manager, MSSP

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.

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:

• 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.

• 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.

• 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

• 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 account structures. AWS preferred.

• Experience driving architecture decisions through structured design reviews, RFCs, or similar frameworks — particularly for multi-tenant or partner-facing systems.

• Able to write clear, durable process documentation that engineering teams can adopt.

• Comfortable with modern backend languages such as Python or Go; able to engage meaningfully in technical discussions and code reviews with engineers.

• Nice to Haves: background in cybersecurity or security platforms; experience with third-party risk management or compliance-adjacent capabilities; familiarity with licensing, entitlements, subscription management, or billing integrations.

• Proven ability to hire, develop, and retain high-performing engineers in remote or distributed environments.

• Strong communication skills across technical and non-technical audiences — able to partner effectively with Product, Partnerships, Customer Success, Finance, and Engineering leadership.

• Demonstrated ability to balance strategic roadmap delivery against a competing stream of partner support and operational needs.

• Proven ability to build, scale, and retain high-performing engineering teams in remote or distributed environments.

This position is remote, but this job may require up to 10% of travel to be successful.

Horizon3 is not just an equal opportunity employer - we are a community that values diversity, equity, and inclusion as fundamental principles of our culture and success. We are dedicated to fostering a workplace where everyone feels welcome and respected, regardless of race, color, religion, sex, national origin, age, disability, veteran status, sexual orientation, gender identity or expression, genetic information, marital status, or any other legally protected status by law.

Our commitment to diversity and inclusion means we strive to attract, develop, and retain a workforce that reflects the varied communities we serve. We believe that diverse perspectives drive innovation and strengthen our ability to create cutting-edge cybersecurity solutions. At Horizon3, every team member is valued and supported in an environment that encourages personal and professional growth.

We welcome candidates from all backgrounds and experiences, and we encourage all qualified individuals to apply. Come be a part of Horizon3, where your unique contributions are recognized, and your potential is limitless.

Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee. Duties, responsibilities, and activities may change at any time with or without notice.