Senior Manager, Customer Success

About this role

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 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.

What You'll Do

Horizon3 http://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.

WHAT YOU'LL DO

Horizon3 is on a mission to help organizations find, fix, and verify exploitable attack paths before attackers can. As we continue to scale across enterprise, federal, and managed security service provider (MSSP) customers, we're looking for a mission-driven, people-first Senior Manager, Customer Success to lead and develop a high-performing team of Customer Success Managers.

This is a people leadership role first and foremost. You'll serve as a coach, operator, and strategic leader, helping your team build trusted relationships with security leaders while ensuring customers successfully operationalize NodeZero as a core component of their security program. You'll drive customer outcomes, influence product adoption, and help define what world-class Customer Success looks like at Horizon3.

LEAD & DEVELOP THE TEAM

Lead, coach, and develop a team of Customer Success Managers supporting Enterprise, Federal, and MSSP customers. Foster a culture of ownership, accountability, continuous learning, and customer obsession while helping your team grow as trusted advisors to security practitioners and executive stakeholders.

DRIVE SECURITY OUTCOMES & PLATFORM ADOPTION

Ensure customers successfully operationalize NodeZero across enterprise, cloud, and hybrid environments. Partner with customers to integrate autonomous pentesting into vulnerability management, exposure management, remediation validation, and broader security operations workflows, driving measurable improvements in security posture and risk reduction.

OWN STRATEGIC CUSTOMER RELATIONSHIPS

Build trusted relationships with CISOs, security executives, security architects, vulnerability management teams, SOC leaders, and other technical stakeholders. Align customer success plans to strategic security initiatives, executive priorities, and measurable business outcomes.

ENABLE EXPANSION & RETENTION

Partner with your team to identify opportunities for broader platform adoption across business units, attack surfaces, and security use cases while proactively mitigating risk, improving customer health, and driving renewals and expansion. Own team performance against Net Revenue Retention (NRR), Gross Revenue Retention (GRR), and customer adoption metrics.

PARTNER CROSS-FUNCTIONALLY

Work closely with Sales, Sales Engineering, Product Management, Support, Threat Research, and Engineering to remove customer blockers, resolve technical challenges, influence roadmap priorities, and deliver a seamless customer experience throughout the post-sales lifecycle.

BUILD OPERATIONAL EXCELLENCE

Establish scalable Customer Success processes, reporting, and operational rigor using Gainsight, Salesforce, and related systems. Define and monitor KPIs that measure customer adoption, health, retention, expansion, and team performance.

DEVELOP PLAYBOOKS & SUCCESS PROGRAMS

Build repeatable customer success frameworks, onboarding programs, executive business reviews, success plans, adoption playbooks, and enablement resources that help customers maximize the value of NodeZero while enabling your team to scale efficiently.

CHAMPION THE VOICE OF THE CUSTOMER

Translate feedback from security practitioners and executive customers into actionable insights for Product and Go-to-Market teams. Help shape the roadmap through customer feedback around attack path validation, cloud security, identity, remediation workflows, and emerging customer needs.

TECHNICAL & SECURITY LEADERSHIP

Coach your team to confidently navigate technical security conversations around exploitability, attack paths, remediation prioritization, security validation, and offensive security best practices. Help CSMs become credible advisors who can engage both practitioners and executive security leaders.

Who You Are

- 7+ years of experience in Customer Success, Technical Account Management, Account Management, or related post-sales leadership roles within cybersecurity or highly techn

Similar jobs

• Senior Manager, Customer Success — Otterai · San Francisco, CA
• Senior Manager, Customer Success — Modmed · Remote
• Senior Manager, Customer Success — Shopmonkey · Remote
• Senior Manager, Customer Success — Tenableinc · US - Remote - Massachusetts , US - Headquarters - Maryland - Columbia
• Senior Manager, Customer Success — Relaypro · Raleigh, NC
• Senior Manager - Customer Success — Inmobi · San Mateo, CA
• Senior Manager, Customer Success Operations — Alphasense · Remote
• Sr Manager, Customer Success — Netdocuments · Lehi, Utah, United States