We’re looking for a Machine Learning Engineer to join our tech team and help build the future of neuro-contextual advertising at integral scale.

Who We Are:
At Seedtag, our mission is to transform advertising by proving that effectiveness and user privacy can truly coexist.

As the leading Neuro-Contextual Advertising Company, we combine Artificial Intelligence, Natural Language Processing, Computer Vision, and neuroscience to understand not only what content is about, but how it makes people feel and what they intend to do next.

Our proprietary AI, Liz, enables brands to connect with audiences across the open web and Connected TV without cookies or user tracking. Founded in 2014 by two ex-Googlers, Seedtag has grown to 700+ Seedtaggers in 17 countries, backed by €250M in funding, and operates today as a global ad-tech leader.

If you enjoy solving complex engineering challenges and building AI-driven systems at scale, you’ll feel right at home here.

Your Challenge:
- As a Machine Learning Engineer on Seedtag's Ad Exchange team, you will:




- Build cutting-edge AI to optimise revenue flow while ensuring the needs of publishers and advertisers are met.
- Research, design, test, deploy, and maintain AI models in a fully online environment to maximise margins, reduce operational costs, and enhance Seedtag's targeting capabilities.
- Design and implement classical ML algorithms and control systems to ensure delivery of internal campaigns and maximise monetisation outcomes.
- Build end-to-end data pipelines to train, validate, and analyse production model behaviour through custom dashboards.
- Continuously improve our MLOps infrastructure, CI/CD pipelines, internal automations, and AI-supported workflows.
- Collaborate closely with Data, Platform, and Backend Engineers to build services and infrastructure, from dataset generation to live model validation.

Our Core Values:
Outcome over Output
We measure success by impact and value, not by volume of features or lines of co

📌 Machine Learning Engineer (Barcelona)
🏢 Seedtag
📍 Barcelona