Job Title

Posted Thursday 22 January 2026 at 01:00 | Expires Sunday 8 February 2026 at 00:59Do you have the skills to fill this role Read the complete details below, and make your application today. At World of Books, were on a mission to become the Planets Bookstore helping people read more while wasting less. As a certified B-Corp and a 200m+ global ecommerce business, data science sits at the heart of how we price millions of books sustainably and profitably. Were now looking for a Principal Data Scientist to play a critical technical leadership role in shaping how advanced modelling and experimentation are applied to pricing at scale. The Role This is a senior individual contributor role (no people management), focused on solving complex, high-impact pricing problems through experimentation, causal inference and applied machine learning. Youll work closely with our Data Science Manager, engineers and commercial leaders, acting as a technical authority and mentor while remaining handson. What Youll Be Doing Leading advanced pricing optimisation, elasticity modelling and experimentation Designing and evaluating A/B tests, bandits and quasi-experiments Building and deploying productiongrade models with strong observability Setting practical standards for modelling, experimentation and DS workflows Mentoring senior and midlevel data scientists through review and example Advising stakeholders on tradeoffs between rigour, speed and business value Identifying future highvalue data science use cases beyond pricing What Were Looking For Deep experience applying data science in commercial environments (pricing, ecommerce or marketplaces ideal) Expert Python and strong SQL Advanced knowledge of statistics, ML and causal inference Proven experience deploying and iterating on models in production Ability to influence through expertise and communicate clearly with senior stakeholders Pragmatic, outcomefocused mindset with comfort in ambiguity Why Join World of Books? Work on meaningful, planetpositive problems at global scale A true Principal IC role with influence but no line management Partner closely with an experienced DS Manager who owns strategy and prioritisation Help shape how data science is practised in a growing, evolving organisation Be part of a missiondriven, collaborative and inclusive culture Interested? xjdpvnf If youre a senior data scientist who thrives on complex problems, handson technical leadership and realworld impact wed love to hear from you. World of Books is proud to be an equal opportunities employer and is committed to building a diverse and inclusive team.