We are offering a Junior Product Engineer position in our Madrid office, to build the global contextual advertising leader.

Seedtag is the leading Contextual Advertising Platform. Our proprietary, machine learning-based technology provides a human-like understanding of the content on the web, the highest level of brand safety in the industry and unmatched cookieless targeting capabilities.

We engage with the market on both demand and supply sides to create, activate and launch high-quality advertising campaigns at scale. We are committed to creating a more beautiful, respectful and engaging way to do advertising.


2014 · Founded by two ex-Googlers

2021 · Fundraising round of 40M€ & +10 countries & +230 Seedtaggers

2022 · Fundraising round of 250M€ + expansion into the U.S market

2023 · Expansion into 15 countries + 500 Seedtaggers


Vision: Lead Seedtag in becoming the best partner for brands and agencies by understanding their needs and working on solutions for them.

It’s responsibilities will include:

  1. Idea Generation for Current Business Lines: The Product Engineer is responsible for coming up with innovative ideas to enhance the existing business lines of Seedtag. This involves understanding the current market trends and the company's product portfolio to identify areas for improvement or expansion.
  2. Validation of Potential New Business Lines: A significant part of the role is to explore and validate new business opportunities. This involves conducting market research, understanding customer needs, and assessing the feasibility of these new lines in terms of technology and market demand.
  3. Collaboration with Tech Teams: The Product Engineer works closely with technical teams to generate and test new ideas and concepts. This collaboration is crucial for transforming ideas into viable products or services, ensuring they are technically feasible and align with the company's technological capabilities.
  4. Development of Proof of Concept (PoC): Developing PoCs is an essential aspect of this role. The Product Engineer is responsible for creating prototypes or models of new products or services to demonstrate their potential in real-world settings. These PoCs are critical for gaining insights and making informed decisions about further development.
  5. Market Testing of PoCs: Once a PoC is developed, the Product Engineer oversees its testing in the market. This involves setting up pilot programs or trials to gather user feedback and understand the market response to the new concept.
  6. Identification of New Opportunities: A continuous aspect of this role is to stay vigilant about new opportunities that could benefit Seedtag. This involves keeping an eye on emerging technologies, market shifts, and potential areas where the company can expand or innovate.


We’re looking for someone who

  • Is very entrepreneurial, not afraid to take risks and has great communication skills
  • Has an educational background in Engineering, maths, tech or a related area
  • Loves technology and staying up to date with AI developments
  • Knows how to make data-driven decisions and work on complex technical problems
  • Speaks English and Spanish fluently, this is a must for this role
  • Is eager to work in a dynamic, innovative and fast-changing startup environment


  • Have previous experience in AdTech
  • Have previously work in Data-related Products/Squads
  • Knowledge on marketing and business


🚀 Key moment to join Seedtag in terms of growth and opportunities

💯 One Seedtag: Work for a month from any of our open offices with travel and stay paid if you’re a top performer

🍽️🚘 Access to a flexible benefits plan with restaurant, transportation, and kindergarten tickets and discounts

🏥 Health insurance included

🏋 Gympass, you will have access to wellness apps with certified psychologists, nutritional plans, on-demand classes and much more

🇬🇧 🇪🇸 🇫🇷 Optional company-paid English, Spanish and/or French courses.

📚 Odilo online school, where you can learn as much as you want.

⌛Real flexible schedule to balance work and personal life. You will be free to choose your work from home and office time with our hybrid style.

🍻 We love what we do, but we also love having fun. We have many team activities you can join and enjoy with your colleagues!


  • Growth: International, highly demanding work environment in one of the fastest growing AdTech companies in Europe. We reject "that’s the way it’s always been done". In Seedtag you can find an energetic, fresh workplace, multicultural work environment where our members are from different countries in Europe, LATAM, the US and so many more!
  • Impact: The chance to have a direct impact, here you don't work for the sake of working, we all have an impact on Seedtag in our own way, rowing in the same direction
  • Diversity of methodology and people: Seedtag DNA is unique and highly appreciated by very different types of Seedtagers. We embrace diversity and encourage everyone to seek the best version of themselves and to show who they really are. With a totally flexible methodology
  • Flexibility: At Seedtag, we trust you, you can work from home, the beach or the office in our hybrid mode

Are you ready to join the Seedtag adventure? Then send us your CV!