Data Scientist – Experimentation Framework

Harnham
City of London
2 days ago
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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.

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