Global Media Effectiveness Manager 

As the Global Media Effectiveness Manager at COS, you will play a key role in contributing to the strategic measurement and optimisation of our global full-funnel paid media strategy. With a strong focus on data and insights, you will ensure our media investment delivers measurable impact and supports both brand and commercial objectives.
Joining the Global Media team, in Marketing & Communications, and in close partnership with Data & Analytics and media agency teams, you will be responsible for evolving our media measurement approach, as well as interpreting data from a range of measurement tools to extract key learnings and actionable insights. You’ll use these insights to inform global media planning decisions and help shape a more effective, insight-led paid media strategy.
What you will do:
Paid Media Effectiveness
Manage and evolve the global paid media measurement framework, including media measurement methodologies, KPIs, reporting standards, learning agendas and experimentation
Establish a global learning and experimentation agenda, assessing paid media effectiveness through incrementality testing, lift studies, and Marketing Mix Modelling (MMM)
Support high-impact experiments that challenge channel assumptions and improve media investment decisions through evidence-based learnings
Drive the adoption of MMM and broader effectiveness insights across markets, ensure insights and recommendations are used to inform market media planning
Paid Media Reporting
Manage the global paid media reporting ecosystem, including the creation of scorecards, dashboards, executive reporting, benchmarking, insights delivery, and reporting templates
Ensure consistency in reporting frameworks, KPIs and measurement standards across markets, enabling effective performance evaluation, benchmarking and decision-making
Translate complex data outputs into clear, compelling narratives for senior leadership and non-technical stakeholders
Provide regular reporting and strategic recommendations to global and regional stakeholders, linking paid media performance to business and commercial outcomes
Paid Media Budget Setting & Investment Planning
Support media investment and annual budget setting work with agency partners and internal stakeholders to determine optimal media spends and splits per market
Utilise brand, customer and marketing data to create evidence-based, localised budget recommendations to inform regional paid media investment strategies
Support quarterly reforecasting and any shifts in investment through the application of MMM insight, customer acquisition KPIs and other media metrics.
Paid Media Measurement Projects
Lead and coordinate cross-functional media effectiveness initiatives, managing project delivery across global, regional, agency and analytics teams
Manage relationships with third party measurement partners, agencies and technology suppliers, ensuring measurement methodologies, data quality and reporting standards are aligned to COS’ business objectives and measurement framework
Strengthen media measurement foundations by partnering with analytics teams and media platforms on initiatives such as conversion signal enhancement and offline sales integration
Evaluate and develop measurement approaches for emerging marketing channels and media priorities, including AI visibility and total search
Identify measurement challenges and develop solutions to ensure media activity is measurable across existing and emerging channels, technologies and business priorities.
Extensive years of paid media measurement experience within a large premium brand or agency environment
Paid media channel expertise - deep knowledge of all paid media channels (paid social, display, OOH, CTV, paid search, programmatic, affiliates).
Advanced proficiency in paid media measurement, including a strong understanding of brand health metrics, paid media attribution models, interpreting MMM, lift studies, and incrementality testing and how to balance them with in-platform signals.
Data-driven decision making – strong analytical skills to interpret brand health, brand media and performance marketing data and translate insights into clear actions.
Deep understanding of P&L impact. Expert at linking upper funnel brand equity metrics to bottom line growth.
Hands-on measurement tools experience - MMM tools, GA4, PowerBI, and in-platform lift studies.
Budget optimisation & media efficiency – ability to maximise ROI and drive impact with constrained budgets.
Stakeholder management & influence - ability to navigate complex organisational structures and influence regional stakeholders to adopt global paid media measurement frameworks
Excellent presentation skills, experienced communicator capable of navigating ambiguity by translating paid media data into clear, actionable narratives. Skilled at presenting and influencing stakeholders, ensuring media investment strategies are presented with clarity.

Employment type
Full-time

Work arrangement
Hybrid