Global Media Effectiveness Manager

Job Description:

Introduction

Dentsu is an integrated growth and transformation partner to the world’s leading organizations. Founded in 1901 in Tokyo, Japan, and now present in over 145 countries and regions, it has a proven track record of nurturing and developing innovations, combining the talents of its global network of leadership brands to develop impactful and integrated growth solutions for clients. Dentsu delivers end-to-end experience transformation (EX) by integrating its services across Media, CXM and Creative, while its business transformation (BX) mindset pushes the boundaries of transformation and sustainable growth for brands, people and society.

iProspect is an important part of our world-class offering - a global digital-first end-to-end media agency. Its unmatched mix of media strategy and storytelling with digital expertise and audience knowledge defines the new territory of performance-driven brand building. By delivering human-centric solutions, iProspect accelerates growth for the world’s most iconic brands. The iProspect team works across a network of more than 8,000 media and performance specialists spread across 93 global markets.

We’re hiring for a Global Media Effectiveness Manager as part of iProspect in London.

Purpose of the Role

The individual will be working hand in hand with the client team, channel specialists and data ops teams to drive quality of insights and recommendations that maximise clients’ full funnel performance and KPIs​. Liaise with teams across markets on a regular basis to support data collection, analyses and recommendations​. They will work with the wider effectiveness team to drive product development. Work in a dynamic and fun client team at iProspect Global – for a large and innovative tech client.

Role Overview

We are seeking a highly analytical and detail-oriented Global Media Effectiveness Manager to lead and scale our media measurement and performance optimization capabilities for one of the world’s most innovative technology clients. This role will be central to ensuring media investments deliver against business outcomes by shaping robust measurement frameworks and processes and delivering meaningful actionable insights globally.

Key Responsibilities

• Design and implement global media effectiveness frameworks that align with full-funnel KPIs—from brand awareness to conversion and retention.
• Manage and manipulate large and complex datasets across markets, platforms, and channels (e.g., digital, TV, social, search) to drive media insights and performance narratives.
• Partner with global, regional, and local teams to ensure measurement best practices and data consistency across markets and campaigns.
• Translate analytical outputs into clear, compelling strategic recommendations in collaboration with channel specialists, strategy & planning teams, and data engineers
• Work with media partners, third-party measurement partners and internal data science teams to ensure the successful deployment of brand lift studies, MMM, A/B testing, and other methodologies.
• Drive thought leadership by staying current with emerging measurement trends, tools, and technologies in the global media ecosystem.

Qualifications + Skills

• Solid foundation in media analytics, data science, or media effectiveness within a global media agency, consultancy, or brand environment.
• Deep understanding of media performance metrics across the marketing funnel (e.g., reach, frequency, brand lift, ROI, CPA, CLV).
• Strong proficiency in Excel, experience with data management, transformation, and visualization tools such as SQL, Python, LookerStudio, Power BI, or Tableau are a plus.
• Proven experience working with global clients and managing multi-market data and/or measurement projects.
• Skilled in media and marketing analytics platforms (e.g., Google Analytics, DV360, Meta Ads Manager, Nielsen, or similar).
• Exceptional communication skills with the ability to turn complex data into meaningful business insights.
• Highly collaborative mindset with strong project management capabilities.

What we offer

• This is a permanent role.
• The team is based in our London office but operates under flexible working arrangements.
• As well as a competitive salary, you’ll enjoy a benefits package that you can tailor to your needs.

Inclusion and Diversity

At Dentsu, we embrace diversity and inclusion, valuing the unique perspectives and contributions of every individual. We believe that diversity fuels creativity and innovation, benefiting our employees, partners, and communities.

We welcome applications from all individuals, regardless of race, ethnicity, nationality, religion, gender, gender identity, sexual orientation, age, disability, marital status, or any other protected characteristic. Beyond recruitment, we strive to create an environment where everyone feels respected, supported, and empowered to bring their authentic selves to work.

We recognise the importance of work-life balance and are open to discussing flexible working arrangements for all roles. If you need reasonable adjustments due to a disability or medical condition during our recruitment process, please contact us at [email protected], quoting the reference number of the role that you are applying for. Your needs will be handled with respect and confidentiality to ensure an inclusive and accessible experience.

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