Senior Data Scientist in London

We bring together the power of marketing research, technology, and AI to help brands maximise the impact of their advertising and unlock the power of long‑term growth.

With a team of researchers, technologists, and data scientists, along with a powerful portfolio of advertising and brand research solutions, MarketCast has established itself as a Top 10 global marketing research provider. Our marketing research helps clients find the right audiences to target, craft ad creative that resonates, and build long‑term brand fandom and customer loyalty.

At MarketCast, machine learning and AI are fundamental to how we deliver insight. We use a wide spectrum of algorithms and techniques from natural language processing and sentiment analysis to predictive modelling. We leverage cutting‑edge techniques to transform complex data into meaningful stories for some of the world's biggest entertainment and media brands.

As a Sr Data Scientist embedded within the MarketCast Data Science Product team, you will be a core builder of the data science capabilities that power our products. Your focus will be on designing, developing, and iterating the models, methodologies, and analytical frameworks that sit at the heart of what MarketCast takes to market. You will work at the intersection of data science and product development, translating complex analytical thinking into scalable, repeatable product solutions. You'll collaborate closely with Product Managers, Engineers, and Researchers to ensure that what we build is both technically rigorous and commercially compelling.

• Product‑Focused Model Development: Design, build, and validate statistical models, machine learning algorithms, and analytical frameworks that form the core of MarketCast's commercial product offerings.
• Research Methodology & Innovation: Develop and refine the methodologies and measurement approaches that underpin our products, ensuring they reflect best‑in‑class data science practice.
• Product Collaboration & Roadmap Input: Work as an embedded data science partner within the wider product team, contributing to product strategy, roadmap prioritisation, and feature definition.
• Prototyping & Experimentation: Lead rapid prototyping and experimentation efforts to test and validate new product concepts and model approaches before they reach full development.
• Data Infrastructure & Scalability: Collaborate with engineering to ensure models and pipelines are built in a way that supports scalable, production‑grade deployment.
• Quality, Validation & Standards: Establish and uphold rigorous standards for model validation, testing, and quality assurance across all product data science work.
• Internal Enablement & Thought Leadership: Act as an internal subject matter expert on the data science capabilities embedded in our products.
• Mentorship & Team Development: Provide technical guidance and mentorship to more junior data scientists, fostering a culture of rigour, curiosity, and continuous improvement.

It'll be Helpful if You Have:

• Master's or Ph.D. degree in Statistics, Mathematics, Computer Science, Economics, or a related quantitative field.
• 5+ years of experience in data science, with a track record of developing models or analytical products that have been deployed commercially or at scale.
• Strong proficiency in Python (scikit‑learn, pandas, numpy, and related libraries), SQL and data pipeline tooling.
• Deep experience with machine learning techniques and Generative AI algorithms.
• Experience developing and validating data science solutions in a product or platform context.
• Solid understanding of experimental design, statistical inference, and model evaluation frameworks.
• Experience working with large datasets and cloud‑based computing environments.
• Ability to communicate complex technical concepts clearly to non‑technical stakeholders.
• Experience in the media, entertainment, or marketing research industry is a plus.
• Strong problem‑solving instincts, intellectual curiosity, and a genuine passion for building things that make an impact.

Our Vision: We are creating the most tech and data‑forward research business on the planet, where primary research, AI, and big data work together to solve complex marketing, content, and product development challenges.

Our Values: Radical Candor, Client Obsession, Unmatched Expertise.

Benefits: In addition to your salary, MarketCast believes in providing a competitive total rewards package for its employees, including generous annual leave, flexitime, a suite of benefits, and professional growth opportunities.

MarketCast is proud to be an equal opportunity workplace, committed to equal employment opportunity regardless of age, disability, gender reassignment, marital status, pregnancy and maternity, race, religion or beliefs, sex and sexual orientation.