Data Scientist

Senior Experimentation Data Scientist (Contract)

Sector: eCommerce Contract Length: 3 months IR35 Status: Inside IR35 Day Rate: £650-£700 per day Location: 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

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Job Details

Company
Harnham - Data & Analytics Recruitment
Location
London, South East, England, United Kingdom
Hybrid / Remote Options
Employment Type
Contractor
Salary
£650 - £700 per day
Posted