Sales Manager - Supply Partnerships Poland · Full-time · Intermediate

StartApp, inc.; Warszawa; On-site; PLN 212,404 - 297,366; Full time

Job summary

StartApp, inc. is seeking a Supply Sales Manager in Warsaw, Poland to drive growth in our publisher partnerships. This role involves managing the entire sales cycle from prospecting to closing deals, focusing on in-app, mobile web, and web publishers.

The ideal candidate will have over 3 years of experience in adtech, a robust network of industry contacts, and a strong ability to negotiate and close deals. Excellent communication skills and proficiency with Salesforce are musts.

Qualifications

• 3+ years of experience in Supply Sales, Business Development, Publisher Development, or similar roles in adtech.
• Strong understanding of mobile advertising ecosystem and monetization models.
• Existing relationships with app developers and publishers.

Responsibilities

• Own the full business development and onboarding cycle for new publisher partnerships.
• Build and execute a territory strategy to grow Start.io's supply footprint.
• Manage commercial negotiations and onboarding processes.

Skills

Negotiation skills

Communication skills

Pipeline management

Relationship building

Market trend analysis

Tools

Salesforce

Job description

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

• 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.