Sales Manager - Supply Partnerships

Description Start.io is looking for a driven and commercially sharp Supply Sales Manager to grow our publisher supply base. This is a hunter role focused on bringing new in-app, mobile web, and web publishers onto the Start.io platform — building the supply-side foundation that powers our programmatic ecosystem. About the Role: You'll own the full sales cycle: from identifying and qualifying publishers, through pitching and negotiating, to closing and handing off to our account management teams. You'll work with some of the most dynamic players in our industry, and play a central role in shaping our supply growth strategy. If you thrive in a fast-paced, data-driven environment and know how to open doors and close deals in the adtech space, we want to hear from you. Responsibilities: Own the full business development and onboarding cycle for new publisher partnerships across in-app, mobile web, and web environments Identify, prospect, pitch, negotiate, and close strategic publisher and app developer partnerships Build and execute a territory strategy to grow Start.io's supply footprint — identifying whitespace, prioritizing verticals, and generating a consistent pipeline of new business Build and manage strong relationships with app developers, publishers, monetization teams, and business stakeholders — engaging from developer-level to C-suite Collaborate closely with Product, Ad Operations, Legal, and Account Management to ensure smooth onboarding and long-term partner success Manage commercial negotiations, IO agreements, and onboarding processes Maintain an accurate and healthy pipeline of opportunities in Salesforce with regular forecasting and deal progress reporting Conduct in-depth research and data analysis to build tailored pitches and identify revenue growth opportunities within target publishers' businesses Stay ahead of market trends in mobile advertising, header bidding, mediation, SDK monetization, identity, and the broader programmatic supply ecosystem — and bring that intelligence back to the business Represent Start.io at key industry conferences, client meetings, and networking events Requirements Requirements: 3+ years of experience in Supply Sales, Business Development, Publisher Development, Account Strategy, or related client-facing roles within adtech, mobile advertising, gaming, or app monetization. Strong understanding of the mobile advertising ecosystem, including SDK monetization, mediation platforms, programmatic advertising, and publisher monetization models Existing relationships with app developers, publishers, monetization teams, or mobile advertising stakeholders Proven track record of consistently achieving or exceeding sales and partnership targets in a quota-carrying role Strong commercial and negotiation skills — comfortable navigating legal and commercial conversations independently Excellent communication and presentation skills; able to earn trust quickly and build long-term relationships Experience managing pipelines and sales processes through Salesforce or similar CRM platforms Ability to operate independently and thrive in a fast-paced, rapidly evolving environment Highly motivated, proactive, and collaborative team player Fluency in English required; additional languages a plus Why Join Start.io? Join a global mobile advertising and data platform working with some of the leading players across the adtech ecosystem. Play a key role in expanding Start.io’s publisher and supply footprint across EMEA and global markets. Work in a fast-paced, entrepreneurial environment with direct exposure to senior leadership and strategic partnerships. Opportunity to directly impact company growth and strategic publisher expansion.