Senior Manager, Strategic Partnerships – Agency Development

BIG HAPPY

Manager driving agency partnerships and executing strategies at Big Happy. Leading growth initiatives and fostering relationships in the ad tech ecosystem.

Posted 6/15/2026full-timeNew York City • New York • 🇺🇸 United StatesSenior💰 $140,000 - $180,000 per yearWebsite

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Hard Skills

agency developmentretail mediaad tech ecosystem managementperformance metrics analysisbusiness plan developmentcommercial deal structuringGTM materials coordinationtraining facilitationworkflow managementmedia activation strategies

Soft Skills

relationship buildingcommunicationanalytical skillspresentation skillsindependent workflow managementstrategic thinkingcollaborationeducation facilitationproblem-solvingconfidence

Certifications & Qualifications

Bachelor’s degree

Industry Keywords

agency partnership strategyholding company dynamicsjoint business plan (JBP)DOOHhigh-impact mobile executionaccount growthmedia plannersstrategistscore leaderskey influencers

About the role

Key responsibilities & impact

Act as the primary strategic supporter to the VP, operationalizing the overarching agency partnership strategy and managing daily workflows to drive business objectives.
Cultivate and maintain deep, daily relationships with core leaders, media planners, supervisors, and key influencers across holding companies and independent agencies.
Partner closely with internal Sales, Client Services, Product, and Marketing teams to track deliverable timelines, align agency feedback with product roadmaps, and support revenue-driving initiatives.
Own the development and rollout of partner-facing toolkits, POVs, playbooks, and case studies. Facilitate education and scaled learning sessions to ensure agency teams fully understand Big Happy’s unique value proposition.
Monitor, analyze, and report on agency partnership performance, spend adoption metrics, and joint business plan (JBP) progress to internal leadership.
Identify organic growth opportunities within existing agency accounts, support commercial deal structuring (such as endeavors or JBPs), and assist in pitches for net-new agency access.
Execute Big Happy’s agency partnership framework across holding companies, independents, and specialty shops.
Position Big Happy as a seamless, day-to-day extension of agency teams for DOOH, high-impact mobile execution, and offsite retail media.
Coordinate GTM materials and lead training efforts to unlock net-new agency access and support Sales teams in deeper account penetration.

Requirements

What you’ll need

Bachelor’s degree or equivalent work experience.
5+ years of professional experience specifically within agency development, retail media, or broader ad tech ecosystem management.
Exhibit a natural "builder" mentality with a strong focus on seamless execution and independent workflow management.
Deeply understand the nuances of agency operating structures, holding company dynamics, and contemporary media activation strategies.
Demonstrate a history of fostering account growth and the confidence to present effectively to mid-and-senior-level external agency leadership.
Communicate with clarity, effectively distilling complex technical platform features into tangible business value for media planners and strategists.
Strong analytical skills with an ability to leverage performance metrics and spend data to drive joint business objectives.

Benefits

Comp & perks

Full-time position with a competitive base salary
Access to benefits, including Healthcare, Dental, and Vision
Big Happy-provided laptop
Participation in Big Happy’s stock program
Paid Parental Leave
Team Happy camaraderie—celebrating wins, learning from challenges, and fostering continuous career growth
A workplace culture where you can be yourself, contribute meaningfully, and be valued for your impact