> Markdown version of [/jobs/ext/3839982-senior-data-scientist-mmm](https://www.wearedevelopers.com/jobs/ext/3839982-senior-data-scientist-mmm). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md).

---

# Senior Data Scientist (MMM)

- **Company:** Harnham
- **Location:** Manchester, UK (Remote available)
- **Experience:** Expert
- **Salary:** £70,000.0 - £90,000.0
- **Contract:** Permanent contract
- **Skills:** Artificial Intelligence, Database Queries, Statistical Hypothesis Testing, Python (Programming Language), SciPy, Pandas, Scikit Learn, Statistics Packages, Power Analysis (Cryptography), Marketplace
- **Published:** October 20, 2026
- **Apply:** https://www.adzuna.co.uk/jobs/details/5934555769

## About the Role

+ Marketing Mix Modelling (MMM)
 + Incrementality testing
 + Lift studies
 + Geo-testing
 + Marketing experimentation
 * Strong statistical background covering:
 + Hypothesis testing
 + Causal inference
 + Power analysis
 + Sample size calculation
 + Regression modelling
 * Strong SQL skills.
 * Python experience (pandas, scikit-learn, scipy, statsmodels).
 * Experience working with modern analytics stacks.
 * Ability to communicate technical concepts to marketing and commercial stakeholders.
 * Comfortable using AI to improve experiment design, workflow efficiency and analytical processes.

Nice to have

 * Bayesian modelling (PyMC, Stan).
 * Value-based bidding.
 * Offline conversion uploads.
 * Marketplace, travel, subscription or considered-purchase environments.
 * LTV and payback modelling experience.

## Description

I'm hiring a Senior Data Scientist - Marketing for a fast-growing B-Corp marketplace operating across 60+ countries, helping thousands of people discover and book unique travel experiences while supporting local businesses.

This isn't a generic marketing analytics role.

They're looking for someone who is genuinely AI-native, highly commercial, and deeply experienced in marketing measurement, experimentation, incrementality, and modelling. You'll be responsible for helping answer one of the most important questions in any digital business:

What marketing activity is actually driving growth, and where should the next pound be invested?

The role

You'll report into the Head of Data and work closely with the Performance Marketing team, owning the business's marketing measurement and modelling capability.

This role sits at the intersection of:

 * Marketing Science
 * Data Science
 * Experimentation
 * Causal Inference
 * Budget Optimisation
 * AI-enabled analytics

You'll be trusted to challenge conventional thinking, validate what's truly driving growth, and influence where significant marketing budgets are invested.

What you'll be doingMarketing Mix Modelling

 * Own and evolve the company's Marketing Mix Model (MMM).
 * Work with frameworks such as:
 + Meridian
 + Robyn
 + PyMC-Marketing
 * Translate model outputs into real budget allocation decisions.
 * Build response curves, saturation models, marginal CAC analysis and investment recommendations.

Experimentation & Incrementality

 * Design and validate robust marketing experiments.
 * Support lift testing, holdouts, geo-experiments and incrementality studies.
 * Evaluate results using rigorous statistical methods.
 * Separate genuine signal from marketing noise.

Attribution & Signal Quality

 * Improve understanding of conversion attribution and marketing effectiveness.
 * Understand how privacy changes affect data quality and marketing measurement.
 * Support value-based bidding and predicted value feedback loops into major advertising platforms.

Advanced Modelling

 * Own and develop customer lifetime value (LTV) models.
 * Build predictive cohort models and uplift models.
 * Improve targeting, retention, and commercial performance through modelling and experimentation.