Principal Client Partner

MediaMath

• Phoenix, AZ

Posted Sep 7, 2026

Job Description Principal Client Partner

Phoenix, AZ; Remote

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 www.infillion.com.

About The Role The Principal Client Partner role will be tasked with selling a suite of connected commerce advertising solutions, from performance-driven advertising campaigns with data and location services to value-exchange engagement ads on CTV to brands and agencies in the West. Experience and agency/client relationships within key markets in the area are important to succeed in this role, as well as an express ability to demonstrate recent business successes in this location.

You will be a key member of a fast-paced and quickly growing sales team. Your focus, and that of your team, is the positioning, presentation, and execution of partnerships leveraging Infillion's unique value-exchange engagement ads as well as location technology and media execution platform.

What You Will Be Doing:

• Leveraging your existing relationships with advertising agencies, brands, and clients to increase revenue through the presentation of Infillion's services and suite of product solutions
• Establish deep relationships with direct clients and agencies for the largest advertisers in region
• Evangelize the Infillion value proposition and solution sell Infillion offerings by honing in on client specific needs, challenges and trends
• Partnering with the Sales Planning team to create proposals in response to RFPs
• Monitoring clients' campaign performance through a partnership with the Account Management Team
• Managing the pipeline of activity and providing regular status updates
• Work with a broad range of internal teams (Account Strategy, Marketing, Legal, Integration and Traffic teams) to support the sales efforts.
• Utilizing Infillion's sales methodology from proposal to close
• Evangelizing Infillion in market and actively sharing materials on thought-leadership
• Representing Infillion's value proposition within the advertising community

Who You Are: A tenacious sales professional: You love the thrill of landing a new account or sale and consistently strive to exceed expectations.

A well-connected social butterfly: The only thing that grows faster than your closed sales is your Rolodex. Your relationships span beyond whatever company you are with or product you are selling.

A mover and a shaker: You're two steps ahead of the person who's two steps ahead, and you've probably already started your 30-60-90 day sales-plan

What You Have:

• 3+ years of experience selling managed service programmatic media within the West region
• Ability to speak to strong established West Coast brand and agency relationships, with experience building and growing these relationships over time
• Thorough understanding of the digital media landscape
• Consultative selling, value selling, and negotiation skills
• Working understanding of CRM tools such as Salesforce
• Superior client facing presentation skills, using data to effectively tell a clear story
• Experience with managed-service or IO based digital programs (identity based solutions a plus)

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 $140,000 - $150,000 USD plus commission for on target earnings of $280,000 - $300,000
• 100% company-paid Medical, Dental, and Vision coverage
• Company-paid Life Insurance and Disability Insurance
• Unlimited paid time off - we trust your discretion
• Opportunities for profit sharing, bonuses, and ownership
• 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.

Skills: Advertising, Advertising Agencies, Application Programming Interface (API), Artificial Intelligence (AI), Automation, Campaigns, Cellular Telephone, Consultative Sales, Consumer Branding, Customer Relations, Customer Relationship Management (CRM) Systems, Digital Media, Ecosystems, Legal, Marketing Campaign, Marketing Strategy, Media Buying and Planning, Media Sales, Multimedia, Negotiation Skills, Partner Sales, Presentation/Verbal Skills, Proposal Writing, Reimbursement, Request for Proposals (RFP), Revenue Growth, Sales, Sales Closing Skills, Sales Management, Sales Pipeline, Sales Presentation, Sales Proposals, Sales Strategy, Sales Support, Salesforce.com, Solution Sales, Thought Leadership, Value Selling

Undefined: MediaMath

Benefits

• Health Insurance
• Dental Insurance

Additional Details

City Phoenix State Arizona Country US

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Principal Client Partner

Phoenix, AZ; Remote

Undefined: MediaMath