Global Media Effectiveness Manager in London

Company Description: COS offers a wardrobe of ready-to-wear and accessories rooted in exceptional quality and lasting design. The brand has an elevated aesthetic that embodies luxury with an emphasis on craftsmanship, innovation and compelling fashion movements.

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, ensuring 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.

Qualifications:

• 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.

This is a Full-time permanent contract based at our Head Office in London. If you feel this opportunity is exciting feel free to apply by sending in your CV in English as soon as possible. Due to data policies, we only accept applications through our career page.

We value collaboration and believe that great ideas thrive when we work closely together. Therefore, this role is primarily office-based, with three days per week at the office to foster teamwork and engagement. Two days per week, you’ll have the flexibility to work remotely.

Why you’ll love working here: We offer all our employees attractive benefits with broad development opportunities. All our employees receive a staff discount usable on all our H&M Group brands in stores and online. In addition to our staff discount, all our employees are included in our H&M Incentive Program – HIP.

In addition to this UK-based colleagues also receive:

• Up to 30 days holiday
• Annual health checks
• Pension scheme
• Discounts on various activities and financial/lifestyle products via our benefits hub
• Cycle to work scheme
• Discounted gym membership
• Employee assistance via retail trust
• Private health & dental care

Join us: Our uniqueness comes from a combination of many things – our inclusive and collaborative culture, our strong values, and opportunities for growth. But most of all, it’s our people who make us who we are. We are committed to a recruitment process that is fair, equitable, and based on competency. We therefore kindly ask you to not attach a cover letter in your application.

We look forward to hearing from you. To ensure we provide an insightful experience to our candidates, and we support their understanding of the role scope and responsibilities for this role, we use an online assessment method for skills-based recruitment with our recruitment processes. You will need to complete it as part of the application and screening process. Your responses will be scored by an assessment tool that applies predefined criteria set by H&M Group. After completing the assessment, you will receive feedback with the score you obtained. If you experience any difficulties or prefer an alternative assessment method, please contact us. Choosing an alternative will not impact your application. For more information on how we process your personal data, please see our Privacy Notice.

Summary Type: Full-time Function: Marketing Experience level: Executive Industry: Retail