Harmonic Security

Customer Success Manager

Harmonic Security

full-time

Posted on:

Location Type: Hybrid

Location: London • 🇬🇧 United Kingdom

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Job Level

SeniorLead

Tech Stack

Cyber Security

About the role

  • **About the Role**
  • As a Customer Success Manager, you’ll own the full customer lifecycle — from onboarding to renewal — and ensure our customers achieve measurable adoption, retention, and ROI. You’ll be a trusted advisor to executives and technical stakeholders alike, building relationships that drive long-term success.
  • **What You’ll Do**
  • - Serve as the primary point of contact for key accounts, adapting to evolving customer needs.
  • - Own the end-to-end customer lifecycle, from onboarding to renewal.
  • - Lead Quarterly Business Reviews (QBRs) and executive-level engagements.
  • - Develop and present data-driven insights that connect product usage to business outcomes.
  • - Champion the voice of the customer, ensuring their needs shape our product and strategy.
  • - Collaborate closely with Customer Success leadership to help build, refine, and scale and Customer Success organization - contributing to the playbooks, processes and metrics that define how Harmonic delivers value to customers at scale.

Requirements

  • **What You Bring**
  • - 7+ years in customer success, account management, or a related client-facing role.
  • - Experience building and executing success programs that demonstrate ROI.
  • - Strong analytical skills with an understanding of success metrics (NRR, GRR, CSAT, time-to-value).
  • - Exceptional communication and presentation skills with executive stakeholders.
  • - Highly organized, adaptable, and proactive — you raise your hand, take initiative, and go the extra mile.
  • - Comfort with technical concepts and ability to translate them into customer value.
  • - Familiarity with CRM and customer success tools.
  • - (Bonus) Experience in cybersecurity or similar technology industries.
  • **What Success Looks Like**
  • - Customers are realizing measurable ROI and expanding their usage of Harmonic.
  • - Renewals and retention metrics are strong, with clear adoption milestones hit.
  • - QBRs drive executive alignment and confirm Harmonic as a trusted partner.
  • - Customer insights are shaping our product roadmap and go-to-market strategy.
Benefits
  • **Why Join Us**This isn’t just a job; it’s an opportunity to be part of a team that’s redefining cybersecurity. At Harmonic, we believe today’s talent is tomorrow’s success — and we’re committed to creating an environment where you can do your best work.
  • - Competitive pay and meaningful equity with direct impact in Harmonic’s success.
  • - Comprehensive benefits, pension plan, generous PTO, and flexible hybrid work.
  • - A small, passionate team that values transparency, creativity, and learning.
  • - Thoughtful leadership that cares deeply about growth, impact, and people.
  • - Annual global offsites (past trips include Lisbon and Nashville).
  • - The chance to shape both our product and our culture as we build a category-defining company.
  • **Harmonic’s Core Values**
  • - **Flourish in the Unknown**: Thrive in unfamiliar situations that require initiative and rapid decision-making.
  • - **Never Full**: Stay hungry for opportunities to learn, grow, and do more.
  • - **Perfect Harmony**: Create cohesion through collaboration, feedback, and shared success.

Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard skills
customer successaccount managementsuccess programsanalytical skillssuccess metricsdata-driven insightspresentation skillstechnical conceptsROI
Soft skills
communicationorganizationaladaptabilityproactivityrelationship building