Start: January 2022

Period: 3/6 months

Working hours: Fulltime

Location: Madrid

We are looking for a talented UX/UI Design Trainee to help us design our solutions and change the world of digital advertising together.


Seedtag is the leading Contextual Advertising Platform. Our proprietary, machine learning-based technology provides human-like understanding of the content in 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 side 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

2018 · 16M total turnover & Internationalization & Getting growth

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


As our new UX/UI Design Trainee you will be:

  • running user testing of our creative solutions
  • considering existing creative solutions and evaluating their UX effectiveness
  • research digital design trends to elevate our creative solutions
  • be able to go from concept to code. HTML, CSS & basic JS


  • have a relevant knowledge in design, html5 and CSS3
  • speak fluent Spanish and have a good level of English or other languages
  • are energetic, proactive, resilient and eager to work in a dynamic and creative environment
  • know all the latest trends and you know how to optimize solutions and performance
  • have the ability to create your own tasks autonomously & proactively, while being aligned with the team objectives


We are an AdTech family where innovative ideas and new ways to do things are welcome, 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 from Europe, LATAM and so many more!, where you will have the chance to impact directly on the company results. Everyone is willing to help because we are all committed to a common objective, making Seedtag the best company in the world!

Seedtag DNA is unique from the very beginning, we celebrate and embrace diversity, also we want all our members (They, he or she) to feel like home, all of the human differences are welcome.


"Joining Seedtag’s Design Team you’ll find the opportunity of a lifetime to learn, face new challenges and push yourself to the best limit in an international environment. In the almost four years that I’ve been working in this company, I’ve grown milestones thanks to learning from the passion and experience of those around me. If you want to learn from the best, this is your place, don’t be afraid and jump in!" Virginia Veros (UK & Italy Design Team Lead)


  • Real flexible work methodology. The option to work from home when you need to, also real flexible working hours.
  • A great workplace location with food, snacks, great coffee and much more.
  • Optional company-paid English and/or Spanish courses.
  • Access to learning opportunities (learning & development budget)
  • We love what we do, but we also love having fun. We have many team activities you can join and enjoy with your colleagues!
  • Access to a flexible benefits plan (plan de retribución flexible) with restaurant, transportation and kindergarten tickets and discounts on medical insurance

Want to be a Seedtagger? Then send us your CV and your portfolio, we are waiting for it!