This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Customer Success Manager based in United States. This is a high-ownership Customer Success role focused on retention, activation, and repeat purchasing in a fast-moving marketplace environment. You will own the post-purchase relationship with customers, from onboarding through long-term account health. The role combines customer engagement, data analysis, problem-solving, and process building. You will establish Customer Success practices from the ground up, including playbooks, health scoring, reporting, and win-back strategies. Your work will have a direct impact on retention and business performance, with visibility to leadership and meaningful ownership of key metrics. You will collaborate closely with sales, support, product, and analytics teams in a data-driven, AI-enabled environment. The position is fully remote, with flexible hours while maintaining at least four hours of daily overlap with US Eastern Time.