Manage post-sales relationships for security SaaS customers, leading onboarding, deployment, adoption, renewals, retention, and expansion. Advise stakeholders on AppSec and vulnerability management workflows, train users, monitor account health, coordinate support and engineering teams, manage feature requests, conduct business reviews, and identify upsell opportunities. The role requires strong cybersecurity knowledge, project management, communication, organizational, and sales skills, with travel up to 20%.