Senior Technical Customer Success Manager (EMEA)

Get to Know Us

Horizon3.ai 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.

As our first Customer Success Manager in EMEA, you'll play a foundational role in growing and shaping our international post-sales experience. You will serve as the strategic advisor to a book of high-value customers—working directly with technical and business leaders to drive adoption, value realization, and retention.

This role requires a background in cybersecurity and someone who is consultative, entrepreneurial, and excited to build relationships across geographies. You’ll work cross-functionally with Sales, Product, Engineering, and Support while influencing the long-term vision for Customer Success across the region.

Responsibilities:

• Manage a portfolio of EMEA customers as their primary post-sales technical advisor, developing a deep understanding of the NodeZero platform to guide successful adoption

• Cultivate champions with security leaders—from analysts to CISOs—and guide them through the lifecycle of adoption, expansion, and advocacy

• Deliver technical onboarding and enablement to drive adoption of NodeZero, including advanced features like Tripwires, Insights, and Rapid Response, ensuring customers realize maximum value

• Proactively identify customer needs and potential challenges, suggesting solutions that improve their experience and enhance their cybersecurity posture

• Partner closely with IT and Security teams (SOC, red/blue teams, AppSec, etc.) to help interpret pentest results, prioritize remediation, and guide long-term offensive security strategy

• Collaborate closely with Sales and Renewals teams to drive retention and growth by identifying expansion opportunities, aligning on account strategy, and ensuring a seamless renewal process

• Act as a customer advocate, relaying customer feedback and technical issues to our internal teams to help drive the evolution of our product and services

• Conduct regular check-ins and quarterly business reviews to align on strategy, secure executive buy-in, and showcase business outcomes.

• Contribute to documentation, training materials, and repeatable playbooks to scale technical success across the region

• Maintain detailed records of customer health and touchpoints using internal CS platforms

Qualifications:

• 5+ years in Customer Success, Technical Account Management, Client Services, within a SaaS cybersecurity environment

• In-depth knowledge of cybersecurity practices and principles; possession of relevant certifications (e.g., CompTIA Security+, CISSP) is preferred.

• Deep understanding of enterprise security, information technology, cloud, or offensive security is highly preferred

• Strong customer acumen—able to align solutions to business priorities and present clearly to both technical and executive stakeholders

• Experience managing a book of business with revenue targets (ARR, NRR, GRR)

• Startup or high-growth company experience is preferred; you thrive in fast-paced, ambiguous environments

• Comfortable with tools like Salesforce, Gainsight, and JIRA; detail-oriented and organized

• Location: London, Amsterdam, Germany or other major EMEA hub (remote friendly)

• Nice to have: Fluent in multiple languages such as German or French

Perks of Horizon3.ai

• Inclusive Team: We value diversity and promote an inclusive culture where everyone can thrive.

• Growth Opportunities: Be part of a dynamic and growing team with numer