Skills

Python Data Analysis SQL Statistical Analysis Stakeholder Management A/B Testing Agile Analytics

Job Specifications

Senior Experimentation Data Scientist (Contract)

Contract Length: 3 months

Day Rate: £650-£700 per day (Inside IR35)

Location: London - Hybrid (2 days per week onsite)

Overview

We are supporting a leading eCommerce business in the search for a Senior Experimentation Data Scientist to deliver high-impact experimentation across logistics and operational initiatives.

This role is explicitly not product-focused and will centre on experimentation relating to promotions, operational efficiency, and logistics performance.

This is a fast-moving engagement with tight timelines, requiring someone who can hit the ground running and operate autonomously within a squad-based delivery model.

Key Responsibilities

Design and execute experimentation frameworks focused on logistics and operational use cases
Lead A/B testing and controlled experiments to evaluate promotional and operational changes
Ensure analytical robustness through sense-checking data, assumptions, and outputs
Work closely with engineers, analysts, and operational stakeholders within a squad environment
Translate experimental outcomes into clear, actionable recommendations for the business
Operate independently while maintaining strong collaboration across technical teams

Technical Requirements

Essential

Advanced SQL (including joins, validation logic, and data interrogation)
Strong Python for analysis and experimentation workflows
Experience working with Google BigQuery or comparable cloud data platforms

Experimentation Expertise

Proven experience designing and building experimentation frameworks
Strong grounding in experimental design, statistical validity, and bias mitigation
Confident explaining experimental approaches verbally, not just via documentation

Ideal Contractor Profile

Senior-level experimentation data scientist with strong commercial awareness
Comfortable working at pace in short, delivery-focused contracts
Able to work independently with minimal oversight
Confident partnering with highly technical teams
Well-prepared, pragmatic, and delivery-oriented
Comfortable operating within tight timelines and changing priorities

Desired Skills and Experience

Skills

Experimentation Design & A/B Testing

Advanced SQL (joins, validation, optimisation)

Python for Data Analysis

Google BigQuery

Statistical Analysis & Inference

Data Quality & Sense Checking

Operational & Logistics Analytics

Stakeholder Management

Agile / Squad-Based Delivery

Experience

Senior-level experimentation data scientist within eCommerce or operational environments

Designing and building experimentation frameworks end to end

Delivering logistics or operations-focused experiments (non-product)

Working independently on short, high-impact contracts

Partnering with highly technical teams under tight timelines

How to Apply

If you have experience building experimentation frameworks and thrive in dynamic, high-visibility roles, we’d love to hear from you.

Apply now by sending your CV and availability to Atif Ahmad.

About the Company

Harnham provides specialist Data and AI recruitment and staffing services, along with bespoke training solutions, across multiple industry verticals, operating in the UK, the USA and EU - contact us today to discuss your requirements: info@harnham.com Our recruitment and talent teams cover all aspects of the data and AI pipeline, from collection to consumption, across multiple data roles and functions. Whether you need full-time staff, contract talent, specialized training, Data-qualified graduates, or C-suite executives... Know more