Sr Manager, Client Success

Job Description

Job Description

About the Company 

Infillion is the first fully composable advertising platform, built to solve the complexity, waste, and opacity in the digital media ecosystem of the last decade. Born from $750 million in investment and the unification of category-defining technologies, including MediaMath, TrueX, Gimbal, Drawbridge, and most recently Catalina, Infillion engineered these powerful assets into scores of interchangeable, agentic-ready components. 

Infillion provides a single, flexible infrastructure that serves media buyers, tech decision-makers, and media sellers. Whether through white-glove managed service, self-service control, or API-based automation, Infillion empowers businesses to execute their unique strategies with zero-hop efficiency, proprietary AI logic, and radical data transparency. Headquartered in New York City, with employees located globally in the US, Costa Rica, and Europe, Infillion powers the world's leading brands, agencies, and platforms. Learn more at

About the Job: 

We are seeking an experienced and dedicated individual to join Infillion as a Sr. Manager, Client Success . This person is a leader, responsible for driving upsell, cross-sell growth, and retention for Midwest region clients in close partnership with Sales and plays a crucial role in ensuring day-to-day client satisfaction post-sale. They will oversee both self-service programmatic clients and managed service relationships..

What you'll be doing:

• Manage and nurture strategic relationships with Infillion's largest regional clients across the Infillion suite of programmatic and managed service media solutions
• Serve as a senior client-facing representative for the West Client Success team
• Partner with regional sellers and sales leads in client meetings and events
• Provide guidance to more junior members of the Client Success team
• Provide training on team processes
• Participate in and provide guidance as needed for RFP responses
• Develop QBR collateral, client presentations, and ad hoc deliverables to support client engagement
• Create bespoke upsell and cross-sell strategies based on client performance and business objectives to grow revenue and retain business amongst regional accounts
• Ensure campaigns launch successfully, pacing and delivery goals are met, and client expectations are consistently exceeded
• Build trust and deep relationships with Sales, Ad Operations, Product, Analytics, and Marketing teams to guide cross-functional projects on behalf of Client Success and influence solutions roadmap 
• Support clients transitioning between self-service and managed service models by facilitating value conversations and seamless onboarding
• Educate clients on new platform capabilities, media products, targeting solutions, measurement offerings, and industry best practices to drive adoption and campaign success
• Analyze campaign performance for large clients and provide strategic recommendations focused on optimization, efficiency, and achieving client KPIs
• Identify opportunities to improve Client Success team workflows and operational efficiency by creating, refining, and scaling internal processes
• Maintain strong knowledge of the programmatic advertising ecosystem, including DSPs, data integrations, targeting methodologies, measurement solutions, and campaign performance metrics.

Who you Are: 

• Proactive and capable of leading meetings and developing sales pitches without significant oversight
• Committed to continuous learning in a collaborative environment.
• An excellent communicator, capable of distilling key partnership concepts for a diverse audience.
• Comfortable working in a fast-paced, dynamic, and collaborative environment.
• A team player who values collaboration and mutual success.

What you have: 

• Experience managing high-spend, cross-product clients, dealing with key agency stakeholders, and presenting to buyers
• Deep fluency with account retention and growth tactics
• Experience partnering with media sellers to drive revenue
• Experience in online advertising account management, sales strategy, and/or brand management
• A bachelor's degree
• 4 - 7 years experience at an advertising agency or digital publisher 
• Excellent listening, negotiation, presentation, written and verbal communication skills
• Strong analytical skills
• Must be comfortable with MS Excel, data analysis, and internet technologies

Benefits & Perks

It's no secret that we work hard, but we also strive to create an office environment where the lines between work and play are blurred. This means we offer these great perks to help keep our team healthy, productive, and happy.

• Base salary of $80,000 - $90,000 plus commission with on target annual earnings of $114,000 - 128,000
• 100% company-paid health, dental, and vision coverage for you and your dependents
• Company-paid life insurance, short-term, and long-term disability
• Unlimited paid time off - we trust your discretion
• Opportunities for profit sharing, bonuses, and ownership
• 401k plan 
• Cell phone reimbursement

We are committed to an inclusive and diverse work environment. Infillion is an equal opportunity employer. We do not discriminate based on race, color, ethnicity, ancestry, national origin, religion, sex, gender, gender identity, gender expression, sexual orientation, age, disability, veteran status, genetic information, marital status or any legally protected status.