Managing Director, Client Partnerships - Mediamath

What You'll Do

Prospect, pitch, and close net new business with independent and mid-market agencies and brand-direct advertisers across the U.S.
Build and manage a pipeline of qualified opportunities from first conversation through signed partnership
Lead consultative discovery to understand client-specific challenges and connect Infillion's platform to measurable outcomes
Develop and deliver compelling proposals in collaboration with Sales Planning and Solutions Engineering
Represent Infillion externally as a programmatic thought leader: at industry events, in trade conversations, and across the advertising community
Drive DSP adoption by positioning Infillion's capabilities against real client needs
Partner closely with Client Success at close to ensure smooth handoffs and strong account starts
Maintain disciplined pipeline hygiene in Salesforce and provide regular, reliable forecast visibility

Who You Are

A relationship-driven hunter. You have a track record of opening and closing net new accounts — not just managing what's handed to you. You know how to build trust quickly and earn a second conversation.

A dual-threaded seller. You're equally comfortable with agency partners and brand-side stakeholders. You understand how buying decisions actually get made, and you work both sides of the table without missing a beat.

A platform thinker. You connect the dots between data, technology, and media outcomes in a way that resonates with sophisticated buyers. You lead with business problems, not feature lists.

A self-starter. Your 30-60-90 is already taking shape. You've identified your targets. You're ready to hit the ground running and make an impact quickly.

What You Bring

7–10+ years of programmatic media sales experience, with a demonstrated track record in new business development
Established relationships across independent and mid-market agencies and brand-direct advertisers
Deep fluency in the programmatic landscape: DSPs, SSPs, identity solutions, data partnerships, and the open web
Experience selling multi-layered platforms — you know how to build a value narrative that goes beyond a single product or format
Consultative and value-based selling skills; you lead with outcomes and back them up with data
Proficiency in Salesforce and a structured, disciplined approach to pipeline management
Strong executive presence and presentation skills; you're comfortable in the room with CMOs and senior agency leadership