Senior Manager, Account Management (New Verticals)

Flex is a growth-stage, NYC headquartered FinTech company that is creating the best rent payment experience. It’s hard to believe that it’s 2026 and paying rent on time is expensive, inflexible, and difficult. We’re here to change that! Flex enables our users to pay rent throughout the month on a schedule that better fits their finances and budget. Our mission is to empower as many renters as possible with flexibility over their most significant recurring expense. After deliberately keeping a stealth profile as we built up unprecedented investor support and an enthusiastic user base, we are looking for motivated individuals to help us keep our mission growing. Will you be a part of the team?

Flex is seeking an ambitious, results-driven Senior Manager of Account Management to launch, manage, and scale high-impact enterprise partnerships. This role is ideal for a driven strategic operator with a proven record of delivering measurable results through partnership growth. You'll play a critical role in developing and executing partnership strategies that directly impact Flex’s bottom line. This position offers a hybrid work environment with the flexibility to work remotely. This is a true 0 -> charter: you’ll be defining the approach, building the pipeline, and closing the deals that put this vertical on the map for Flex.

Partnership Development & Launch

• Launch new strategic partnerships aligned with Flex’s growth objectives

• Lead the creation of joint business plans, financial modeling, and growth initiatives

• Define, implement and run winning operating rhythm to maximize value

• Collaborate cross-functionally with Sales, Marketing, Product, Engineering, Support and Legal teams at Flex and partner organizations to maximize execution and impact

• Manage and expand relationships with Flex’s largest strategic partners, fostering trust and long-term collaboration across the organization

• Build and deliver on your partnership business plan; drive progress on key partner initiatives, resolving issues and aligning stakeholders to deliver measurable wins

• Own day-to-day partner operations, ensuring smooth execution and communications

• Drive monthly and quarterly partnership business reviews

• Track, analyze, and report on partnership performance metrics, identifying areas for improvement and ensuring accountability

• Design and oversee partnership GTM efforts working closely with product, sales and marketing teams

Strategy

• Develop and implement processes and frameworks to manage partnerships efficiently.

• Align partnership initiatives with Flex’s broader strategic objectives.

• Provide insights and strategic recommendations to continuously enhance partnership value.

• 6-8+ years of relevant experience in FinTech/SaaS business development, strategic partnerships, enterprise sales, investment banking, or top-tier strategy consulting roles

• Demonstrated success launching and scaling strategic partnerships or managing high-value strategic client relationships.

• Exceptional skills in relationship-building, cross-functional collaboration, stakeholder alignment, and execution.

• Strong analytical capabilities, with experience leveraging data-driven insights to inform strategic decisions.

• Excellent communication, negotiation, and presentation abilities, capable of influencing at senior levels.

• Highly organized, detail-oriented, and capable of managing multiple high-stakes projects simultaneously.

• Comfortable thriving in fast-paced,