Senior Manager, Customer Success

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 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 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.

Horizon3.ai is on a mission to help organizations find, fix, and verify exploitable attack paths - before attackers can. As we scale our impact with global enterprises and managed service providers, we're looking for a mission-driven, people-first Manager of Customer Success to lead and grow a high-performing team of CSMs supporting our enterprise, federal, and MSSP customers.

This is a people leadership role first and foremost. You’ll serve as a coach, strategist, and operator, driving performance across the team while directly influencing customer outcomes. You’ll ensure our customers realize value from NodeZero, champion their success internally, and help define what world-class customer success looks like at Horizon3.

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• 7+ years of experience in Customer Success, Account Management, or related post-sales roles in cybersecurity or B2B SaaS

• 2–3+ years of direct people management experience, with a track record of hiring, coaching, and leading CSMs to strong outcomes

• Proven success meeting or exceeding goals tied to Net Revenue Retention (NRR), Gross Dollar Retention (GDR), and expansion

• Experience managing strategic customers (Fortune 500), with executive-level relationship management and negotiation skills

• Deep understanding of security operations and/or MSSP business models (e.g., red teaming, vulnerability management, SOC workflows)

• Confident working with technical products and customers - able to translate customer needs into product feedback or tailored success plans

• Strong communicator and storyteller with excellent presentation skills and executive presence

• Comfortable navigating ambiguity and building post-sales programs in a fast-paced, high-growth environment

• Proficient in Gainsight, Salesforce, JIRA, and Confluence

• Bachelor’s degree required; advanced degree or MBA is a plus

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.

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