Data Scientist

Expedia Group
City of London
2 days ago
Create job alert

Data Scientist III, Experimentation & Statistics


Expedia Group brands power global travel for everyone, everywhere. We design cutting-edge tech to make travel smoother and more memorable, and we create groundbreaking solutions for our partners. Our diverse, vibrant, and welcoming community is essential in driving our success.


Why Join Us? To shape the future of travel, people must come first. Guided by our Values and Leadership Agreements, we foster an open culture where everyone belongs, differences are celebrated and know that when one of us wins, we all win.


We provide a full benefits package, including exciting travel perks, generous time-off, parental leave, a flexible work model (with some pretty cool offices), and career development resources, all to fuel our employees' passion for travel and ensure a rewarding career journey. We’re building a more open world. Join us.


About the Role


Are you passionate about experimental design, causal inference, and bridging the gap between statistical theory and real-world impact? We are looking for a Data Scientist specialising in experimentation science to lead the design and validation of our product experimentation methodologies.


This is not a generic data scientist or analyst role. We are seeking someone who:


  • Has led the design, validation, and scaling of statistical methodologies for controlled experiments (not just “run A/B tests”)
  • Excels at building or adapting frameworks for hypothesis testing, simulation, and error control in noisy, messy, production environments
  • Can clearly explain experiment design, trade-offs, and findings to technical and non-technical stakeholders alike
  • Brings scientific rigour and pragmatic creativity to complex, ambiguous challenges


What you will do


  • Own the experimental methodology: Design, implement, and validate statistical frameworks for A/B and controlled experiments, including novel approaches for challenging business problems and partial compliance data
  • Develop and evaluate simulation frameworks: Use Monte Carlo, bootstrapping, or other simulation methods to estimate power, sensitivity, and error rates of experimentation workflows before they go live
  • Translate results for action: Communicate assumptions, trade-offs, and experiment outcomes (including limitations and risks) to engineers, product leaders, and business partners—regardless of statistical background
  • Advance the discipline: Drive integration of new methods—from Bayesian inference and sequential testing to causal modelling—into our real-world experimentation platform
  • Foster data-driven culture: Coach partners on statistical best practices, experimental design, and quality control


Minimum Qualifications


  • Bachelor’s degree or higher in Statistics, Mathematics, Biostatistics, or a highly quantitative field—strong foundation in statistical theory is essential
  • Demonstrated, hands-on experience designing (not just running) A/B or controlled experiments in production or business environments
  • Direct experience with statistical methodologies, such as hypothesis testing, confidence intervals, error rate control, and handling biases/confounders
  • Proficiency in at least one language for statistical analysis (Python, R, or PySpark), with the ability to develop and implement simulation or analysis frameworks
  • Track record of clear, effective explanation of statistical concepts and results to non-technical and technical partners alike
  • Proven ability to own projects end-to-end and influence product or business decisions


Preferred Qualifications


  • Advanced degree (PhD or MSc) in Statistics or related field with an applied experimentation component
  • Experience building or evolving experimentation tools/platforms (not just using off-the-shelf products)
  • Experience with causal inference, Bayesian methods, or sequential/online testing in industry settings
  • Publications, open-source contributions, or professional presentations on experimentation/statistics topics
  • Prior experience in travel, marketplace, or e-commerce experimentation environments


What makes you successful in this role?

You thrive when you:

  • Build new experiments from scratch and justify your methodological choices (rather than re-running legacy designs)
  • Prioritise explanation and impact over jargon and buzzwords
  • Translate statistical nuance for audiences at all levels, keeping communication as rigorous as your analysis
  • Love collaborating in interdisciplinary teams and value transparency and scientific integrity.

Related Jobs

View all jobs

Data Scientist

Data Scientist - Imaging - Remote - Outside IR35

Data Scientist (Predictive Modelling) – NHS

Data Scientist - Measurement Specialist

Data Scientist

Data Scientist

Subscribe to Future Tech Insights for the latest jobs & insights, direct to your inbox.

By subscribing, you agree to our privacy policy and terms of service.

Industry Insights

Discover insightful articles, industry insights, expert tips, and curated resources.

What Hiring Managers Look for First in Data Science Job Applications (UK Guide)

If you’re applying for data science roles in the UK, it’s crucial to understand what hiring managers focus on before they dive into your full CV. In competitive markets, recruiters and hiring managers often make their first decisions in the first 10–20 seconds of scanning an application — and in data science, there are specific signals they look for first. Data science isn’t just about coding or statistics — it’s about producing insights, shipping models, collaborating with teams, and solving real business problems. This guide helps you understand exactly what hiring managers look for first in data science applications — and how to structure your CV, portfolio and cover letter so you leap to the top of the shortlist.

The Skills Gap in Data Science Jobs: What Universities Aren’t Teaching

Data science has become one of the most visible and sought-after careers in the UK technology market. From financial services and retail to healthcare, media, government and sport, organisations increasingly rely on data scientists to extract insight, guide decisions and build predictive models. Universities have responded quickly. Degrees in data science, analytics and artificial intelligence have expanded rapidly, and many computer science courses now include data-focused pathways. And yet, despite the volume of graduates entering the market, employers across the UK consistently report the same problem: Many data science candidates are not job-ready. Vacancies remain open. Hiring processes drag on. Candidates with impressive academic backgrounds fail interviews or struggle once hired. The issue is not intelligence or effort. It is a persistent skills gap between university education and real-world data science roles. This article explores that gap in depth: what universities teach well, what they often miss, why the gap exists, what employers actually want, and how jobseekers can bridge the divide to build successful careers in data science.

Data Science Jobs for Career Switchers in Their 30s, 40s & 50s (UK Reality Check)

Thinking about switching into data science in your 30s, 40s or 50s? You’re far from alone. Across the UK, businesses are investing in data science talent to turn data into insight, support better decisions and unlock competitive advantage. But with all the hype about machine learning, Python, AI and data unicorns, it can be hard to separate real opportunities from noise. This article gives you a practical, UK-focused reality check on data science careers for mid-life career switchers — what roles really exist, what skills employers really hire for, how long retraining typically takes, what UK recruiters actually look for and how to craft a compelling career pivot story. Whether you come from finance, marketing, operations, research, project management or another field entirely, there are meaningful pathways into data science — and age itself is not the barrier many people fear.