Smadex is a leading advertising technology company founded in Barcelona in 2010 and sold to American-based and stock-listed Entravision in 2018 (NYSE::EVC). We are one of the top mobile ad-tech companies in the world and the largest Demand Side Platform (DSP) based in Europe, with our revenues over +$100M and consistently growing +40% YoY over the past years.

Our mission is to continue to improve our ad-tech platform to help our clients achieve their programmatic advertising campaign goals, and we want to give our employees a job they’ll love, where they will be challenged to improve results through real-life engineering and data analysis and where everyone’s implication has an impact.

Are you ready to be part of the new unicorn? Keep reading!

Role overview You will be a Senior Machine Learning Engineer dedicated to the hands‑on development and optimization of our creative selection recommendation engine. This is a critical role that operates within our high‑frequency, complex auction ecosystem and requires a strong blend of engineering, analytical, and cross‑functional communication skills.

Responsibilities

Development, maintenance, and optimization of the core creative selection recommendation engine





Coordination with creative team to define their needs and translate them into robust technical solutions

What you need to have:

5+ years of relevant experience in Data science / Machine Learning positions

Background in Mathematics, Physics, Computer Science or Data Science.

Proficiency in Python, SQL, Statistics

Hands‑on experience developing solutions in related fields such as Adtech, Recommender Systems, or Marketplaces

Knowledge of recent advances in recommendation systems

Possesses excellent communication skills both verbal and written

Fluency in English

Please note that we do NOT provide VISA sponsorship. Candidates without a legal permit to work in Spain won't be considered.

Reward package

Integrate a highly motivated and young team.

Great compensation package.

Top location at the heart of Barcelona in a penthouse office with a rooftop terrace, barbeque, and a fully stocked fridge.

Work from home: 2 days/week

Private Health Insurance

Access to LinkedIn Learning

Meal vouchers - Tickets Restaurant monthly allowance.

Monthly gym allowance: Choose between DiR Gym and Wellhub

Monthly TGIF events.

Regular team‑building events.

Fun and friendly work environment with talented marketers and engineers from over 40+ countries

And more!

📌 Machine Learning Senior Engineer (Recommendations) (Madrid)
🏢 Smadex
📍 Madrid