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 Media Effectiveness Partner as part of Global iProspect in London.
Purpose of the Role
We are seeking a forward-thinking leader in media effectiveness to shape and implement a cutting-edge experimentation and measurement strategy for a global portfolio of leading commerce brands. This role will focus on embedding a culture of test-and-learn, deploying advanced measurement methodologies like Marketing Mix Modelling (MMM), and elevating the client’s measurement maturity through consultancy, capability-building, and change management.
As part of iProspect Global, this role is instrumental in connecting marketing performance to business impact across the full funnel. You will partner with internal experts and client stakeholders to develop scalable, insight-led frameworks that guide investment decisions, operationalize effectiveness tools, and accelerate innovation across channels and markets.
Key Responsibilities
- Design and implement global measurement and experimentation frameworks that enable a rigorous test-and-learn approach across markets and media channels.
- Lead the deployment of MMM, geo-testing, incrementality and brand lift studies to quantify media’s contribution to business outcomes.
- Built and guide the strategic learning agenda, aligning testing priorities with commercial goals (e.g. ROAS, CAC, LTV, brand equity).
- Partner with platform, analytics, and data science teams to operationalize experimentation and deploy modular, scalable measurement solutions.
- Support and train team’s inn turning testing results and model outputs into clear actionable insights that inform full-funnel planning and investment decisions.
- Act as a change leader, supporting the adoption of new measurement approaches through structured governance, stakeholder engagement, and communications,
Qualifications + Skills
- Extensive experience in media effectiveness, marketing science, or measurement consultancy within a global agency, consultancy, or client-side environment.
- Proven track record leading global experimentation and MMM deployments across multiple markets and touchpoints.
- Deep knowledge of measurement methodologies and a variation of marketing analytics solutions including key platforms: GA4, Meta, Amazon
- Strong understanding of commerce-focused performance indicators, customer journey analytics, and full-funnel KPIs.
- Excellent strategic and storytelling skills – able to turn complex test results and model findings into compelling business narratives.
- Demonstrated expertise in change management, training, and scaling measurement maturity programs globally.
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 , 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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Location:
London
Brand:
Global Iprospect
Time Type:
Full time
Contract Type:
Permanent
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