Lead Data Scientist - Titan OS (Hybrid)

Titan OS; Barcelona; On-site; EUR 90,000 - 120,000; Full time

Benefits offered by this job

Private health insurance

International work environment

Competitive compensation

Job summary

Titan OS, a Barcelona-based technology company, seeks a Lead Data Scientist to shape data products and models with a strong emphasis on advertising audiences, targeting, and measurement. You will mentor a growing team and collaborate across product, engineering, and commercial teams to deliver business value.

You will lead the data science direction, build scalable pipelines, and help drive decisions with experiments and analytics. English proficiency required; on-site in Barcelona.

Qualifications

• 6+ years in data science or ML, with at least 2 years leading projects or people.
• Track record of building data products that went to production with business impact.
• Experience in advertising or ad tech: audiences, targeting, measurement, programmatic or similar.
• Strong Python and SQL; knowledge of ML libraries (scikit-learn, PyTorch, XGBoost).
• Statistics: experiment design, causal inference, forecasting.
• Experience with large datasets and modern data platforms.
• Understanding of data privacy and GDPR implications on modeling.
• Professional English level.

Responsibilities

• Build data products and ship models to production.
• Design audience segments, scores, APIs or dashboards.
• Collaborate with data engineering for scalable model deployment and monitoring.
• Set data science vision and roadmap with product and engineering.
• Lead and mentor the data science team; hire and grow new scientists.
• Explain complex results clearly to technical and non-technical stakeholders and clients.

Skills

Python

SQL

Experiment design

Leadership

Ad tech experience

Tools

DBT/SqlMesh

scikit-learn

PyTorch

XGBoost

MLOps tools

Job description

Is this you?

Titan Operating System S.L. (Titan OS), the Barcelona-based technology, entertainment, and advertising company, is looking for you!

Our platform combines content discovery and advertising technology in one solution, helping leading TV brands unlock greater value. Titan OS powers devices from major brands including Philips, AOC and JVC, reaching millions of viewers across Europe and LATAM. Titan OS is also powering free premium FAST Channels on selected SONY Android TVs.

Over the last two years, Titan OS has grown revenue 10x and attracted leading investors, including Highland Europe and Mangrove.

At TitanOS, we live by three core values:

• Make things happen - We take ownership, move fast, and deliver impact
• No ego - We collaborate with respect and humility to reach shared goals
• Show genuine passion - We love what we do and never stop learning

Culture and environment are at the heart of our ethos. If the above resonates with you, keep reading because we believe you could be a perfect addition to our incredible team!

The Role

We are looking for a Lead Data Scientist to turn our data into products. You will build models and data products that create real value for the business, with a strong focus on advertising: audiences, targeting, measurement and yield.

Advertising will be your main area, but not the only one. You will also help other teams with content recommendations, user engagement and business analytics.

This is a hands-on lead role. You will write code and ship models yourself, and you will also set the direction for data science at Titan OS, mentor other people and work closely with product, engineering and commercial teams.

What you will do:

Build data products

• Take ideas from the first question to a product in production: define the problem, build the model, measure the impact and improve it.
• Design data products that other teams and partners can use, for example audience segments, scores, APIs or dashboards.
• Work with data engineering to make sure models run reliably at scale, with good monitoring and clear ownership.
• Decide when a simple solution is good enough and when a more complex model is worth it.

• Build audience and segmentation models based on viewing behaviour, content and device data.
• Develop targeting, lookalike and contextual models for CTV campaigns.
• Improve ad performance and revenue: forecasting of inventory, pricing and yield optimization, frequency and reach.
• Design measurement and attribution methods so advertisers can understand the value of their campaigns.
• Work with identity and enrichment data (household and device level) to improve reach and match rates.

Other areas

• Content recommendations and personalization for the home screen and FAST channels.
• User engagement and retention analysis.
• Support business decisions with clear analysis, experiments and A/B tests.

Leadership

• Set the data science vision and roadmap together with product and engineering.
• Build the data science team from scratch: hire, mentor and grow new data scientists.
• Define good practices: code quality, reproducibility, experiment design and model evaluation.
• Explain complex results in a simple way to technical and non-technical people, including clients and partners.

What you bring

• 6+ years of experience in data science or machine learning, with at least 2 years leading projects or people, including hiring.
• A track record of building data products that went to production and had a clear business impact.
• Experience in advertising or ad tech: audiences, targeting, measurement, programmatic or similar.
• Strong skills in Python and SQL (DBT/SqlMesh), and good knowledge of the usual ML libraries (for example scikit-learn, PyTorch, XGBoost).
• Solid statistics: experiment design, causal inference, forecasting.
• Experience working with large datasets and modern data platforms .
• Good understanding of data privacy and how it affects modeling (consent, GDPR).
• Professional level of English.

Nice to have

• Experience in CTV, streaming, media or TV measurement.
• Knowledge of identity graphs, household matching or data clean rooms.
• Experience with recommender systems.
• Experience with MLOps tools (feature stores, model registries, orchestration).
• Knowledge of the IAB standards (TCF, OpenRTB).

Reasons to apply:

• Competitive compensation
• Private health insurance
• Friendly, diverse, and international work environment
• Opportunity to work outside of your comfort zone and develop professionally in an exciting and fast-growing CTV industry.
• Change the future of TV! A unique opportunity to join a well-funded, high-growth company in the early stages to help shape a product/business that will impact millions.