Data Scientist Geo Holdout & Incrementality (12 month FTC) in London

About WPP Media

WPP is the trusted growth partner for the world's leading brands. With exceptional talent, trusted data and intelligence, and world-class partnerships - all united by our pioneering agentic marketing platform, WPP Open - we help clients navigate change, capture opportunity, and deliver transformational growth.

WPP Media is WPP's AI-driven media operating unit, bringing together media, data, and partnerships to deliver creative personalisation at scale. Connected through WPP Open and powered by Open Intelligence, clients see exactly where, how, and why their media investment is working.

Role Summary and Impact

The purpose of this document is to help prospective team members better understand the role and responsibilities for the position of Data Scientist - Geo Holdout Programme at OpenDoor, WPP's bespoke global operating model for Amazon.

ABOUT WPP & OPENDOOR

At WPP, we're constantly reinventing the future of creativity on an ever-broader canvas, bringing together unrivalled talent, resources and skills to provide an integrated offer of communications, experience, commerce and technology.

Over the last decade, we have developed a dedicated global client practice with the mission of accelerating WPP's impact for our largest clients by bringing them the best of WPP. Each team is custom-built around a client's specific needs and challenges, providing easy access to the right capabilities. And that's why we've built OpenDoor for Amazon.

OpenDoor is a unique integration of the best of WPP and Amazon - building on their respective strengths and visions. Whether at WPP or at Amazon, every project is an OpenDoor on new possibilities. Anything and everything can be an opportunity for our people to drive impact - for them to innovate, learn, thrive, and occasionally fail too.

The unique OpenDoor partnership model is built to deliver next-level Productivity, fueled by our industry-leading approach to People, Platforms, and Process. OpenDoor spans across all WPP agencies and disciplines such as media, business consultancy, communications and brand strategy, tech and commerce, public relations, and production.

OpenDoor's values are built from Amazon's own 16 Leadership Principles, and WPP's core values of Open, Optimistic and Extraordinary. Together, when WPP's Creative Transformation meets Amazon's next-level customer centricity, our people come together to challenge and impact what's done today and build a better future.

By joining OpenDoor, not only are you joining a cross-function team partnering with one of WPP's top five global clients, but you are also taking a step to challenge yourself and the world around you every day, working in the most unusual way on some of Earth's most ambitious opportunities in marketing, tech, media, business, and creativity.

ABOUT THE ROLE

We are searching for a talented and technically exceptional individual to join our OpenDoor team as a Data Scientist, dedicated to the delivery of Prime Video's expanded geo holdout programme across Europe. This is a full-time permanent position based in London. The role reports into the EU Measurement Lead.

This is a rare opportunity to own the technical backbone of one of the most analytically rigorous media measurement programmes in market - designing and operating the infrastructure that enables up to 55 geo holdout experiments across seven European markets, including the UK, Germany, France, Spain, Italy, and optional extension into Poland and Turkey. The work sits at the intersection of geospatial data engineering, media platform API integration, and incrementality measurement, and will directly inform how Prime Video plans and invests in theatrical and streaming campaigns across APAC and Europe.

RESPONSIBILITIES

• Own the end-to-end technical implementation of the geo holdout programme, serving as the dedicated technical lead across all markets and experiment waves.
• Construct and maintain the NUTS3-to-platform geo lookup table, mapping regional boundary data from ONS and Eurostat sources to platform-specific geo targeting formats across Meta, DV360, X, Sprinklr, and all other in-scope media platforms.
• Build and operate the weekly campaign-to-experiment calendar matching script, ensuring geo exclusions are flagged, applied, and verified ahead of each experiment activation.
• Develop and maintain API scripting and bulk upload templates to apply and verify geo exclusions directly within each platform's native geo-targeting capabilities.
• Produce and validate weekly verification reporting at NUTS3 and postcode level, delivered to key Prime Video stakeholders every Friday, clearly documenting impression leakage rates against the programme's defined accuracy thresholds.
• Own human oversight of the agentic QA solution - reviewing automated flags for impression leakage, exclusion drift, and reporting anomalies.