Job Specifications
Senior Marketing Researcher (Marketing Science)
Contract: 12 months
Rate: £300 per day
Location: London, Hybrid Working
Be the architect of marketing truth.
We’re partnering with a globally recognised technology-led organisation on a senior marketing research contract at the cutting edge of marketing science. This role is for someone who doesn’t just report performance — they change how decisions are made.
Your mission: help the organisation transition from correlation-based reporting to causal-based decision making, ensuring every marketing pound works harder, smarter, and with provable impact.
You’ll sit at the intersection of Marketing Mix Modelling, Data Clean Rooms, and Experimental Design, stewarding a triangulated measurement framework that guides high-stakes investment decisions across the business.
What You’ll Be Doing
Strategic Modelling & Budget Optimisation (40%)
Translate complex Marketing Mix Model outputs (response curves, saturation, adstock) into clear, confident budget recommendations.
Partner with Finance and Marketing leadership to defend budget shifts using marginal ROI (mROI).
Build predictive models to simulate business outcomes across different economic and spend scenarios — acting as the early-warning radar for marketing performance.
Data Clean Rooms & Advanced Analytics (30%)
Act as analyst lead for Data Clean Room strategy, with a focus on Meta Advanced Analytics.
Write and optimise advanced SQL to securely join hashed first-party data with platform exposure data.
Move beyond generic lookalikes by designing high-value, precision audiences based on LTV, retention probability, and behavioural signals.
Learning Agenda & Causal Experimentation (30%)
Own the organisation’s Learning Agenda, defining a quarterly roadmap of hypotheses prioritised by business impact.
Design and execute rigorous Conversion Lift and Brand Lift Studies, including power calculations, holdout design, and implementation oversight.
Meta-analyse experimental results to codify best practices for Creative and Media teams.
Educate stakeholders on the difference between vanity metrics (clicks, ROAS) and value metrics (incremental sales, profit).
Communicate complex ideas simply — telling compelling stories with data.
What We’re Looking For
Must Have
A number of years experience in marketing science, market research, or advanced analytics
Degree in a quantitative discipline (Economics, Statistics, Mathematics, Physics, Data Science).
Advanced SQL skills (CTEs, window functions, join optimisation).
Proven experience building or managing Marketing Mix Models.
Strong understanding of Bayesian inference, adstock, and saturation curves.
Experience with AI tools and/or process automation.
Nice to Have
Hands-on experience with Data Clean Rooms (Meta AA, AMC, ADH, Snowflake).
Deep knowledge of hypothesis testing, confidence intervals, and bias.
Ability to explain posterior distributions to a CMO as “updated beliefs.”
Understanding of AdTech, paid media mechanics, ROAS vs CAC, and margin profiles.
Confident, collaborative communicator who can influence senior stakeholders.
About the Company
Randstad is the world’s largest talent company and a partner of choice to clients. We are committed to providing equitable opportunities to people from all backgrounds and help them remain relevant in the rapidly changing world of work. We have a deep understanding of the labor market and help our clients to create the high-quality, diverse and agile workforces they need to succeed. Our 46,000 employees around the world make a positive impact on society by helping people to realize their true potential throughout their worki...
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