Data Scientist

About the RoleThe organisation is transitioning its Marketing Mix Modelling (MMM) capability from a fully outsourced solution to an in-house MMM team.A specialist external vendor will continue to support industrialised model development and technical execution. However, the internal team will own the methodology, modelling decisions, quality standards and governance.We are looking for a Senior Data Scientist – Marketing Mix Modelling to provide the methodological expertise required to establish this capability and set the standards that external modelling partners must meet.This is a build-focused role, rather than a maintenance position. You will help establish methodologies, standards, documentation and best practices for MMM across a global organisation operating in 30+ markets.Key ResponsibilitiesStrategic DirectionContribute to the overall MMM programme design, modelling strategy and analytical deep dives.Help establish a scalable and consistent MMM framework across markets.Model Methodology & DirectionDefine the analytical framework, variable structures and modelling approaches for MMM.Guide modelling decisions across markets rather than relying solely on vendor recommendations.Combine established industry standards with organisation-specific business requirements.Work with both classical regression and Bayesian MMM approaches.Vendor Governance & Quality AssuranceReview and validate external vendors' modelling methodologies, assumptions and outputs.Challenge modelling decisions when evidence does not support them.Request revisions or rework where models do not meet agreed quality standards.Establish clear quality criteria for MMM deliverables.Deep-Dive AnalysisLead advanced analyses at country, regional, channel and campaign level.Address analytical questions from Marketing and Business Steering beyond the standard MMM scope.Translate complex modelling findings into evidence-based analytical insights.Learning & ExperimentationContribute to the organisation's learning agenda around marketing effectiveness and performance.Collaborate with experimentation teams to connect incrementality testing with MMM findings.Help identify opportunities to improve the organisation's understanding of marketing effectiveness.Documentation & Knowledge TransferBuild and maintain a structured MMM methodology library.Establish versioned documentation, standards and decision logs.Ensure knowledge is retained within the organisation rather than being dependent on individual employees or vendors.Standards & MeasurementContribute to consistent definitions of Marketing ROI and other MMM metrics.Help establish common terminology and measurement standards across Marketing, Business Steering and country organisations.Stakeholder CollaborationWork closely with other members of the MMM team.Collaborate with Marketing, Finance, Business Steering, experimentation teams and external modelling partners.Support alignment across markets and ensure the MMM programme operates consistently.What This Role Does Not OwnThe role will not be responsible for:Day-to-day vendor contract or commercial management.Converting MMM outputs into country-level media or budget recommendations.Media planning, media buying or media execution.Activities that could compromise the independence of the measurement function.Must-Have RequirementsCandidates must have:3+ years of hands-on experience building and validating Marketing Mix Modelling (MMM) or econometric models in a commercial or agency environment.Strong practical experience with Marketing Mix Modelling / econometrics.Familiarity with Bayesian MMM approaches as well as classical regression-based modelling.Strong understanding of marketing and media channels and how they behave within MMM models.Understanding of short-term vs. long-term marketing effects.Ability to independently evaluate modelling assumptions, methodology and outputs.Strong analytical and statistical modelling capabilities.Excellent English communication skills.Strongly PreferredExperience in retail, FMCG or another complex multi-market organisation.Experience evaluating, reviewing or challenging third-party modelling methodologies.Experience working with external vendors, agencies or academic modelling partners.Previous responsibility for quality governance of external modelling deliverables.Experience connecting Marketing and Finance stakeholders around marketing investment and effectiveness questions.Experience working across multiple countries or markets.Experience establishing MMM methodologies or analytical standards from the ground up.