Join RSSB as Principal Data Scientist and lead the delivery of AI and machine learning solutions that make a real impact across the rail industry. In this senior role, you''ll identify high-value opportunities, engage stakeholders, and ensure our digital products solve real-world challenges. You''ll mentor and develop the team, champion best practices, and represent RSSB''s Data Science and AI capability across the sector. You''ll drive innovation by introducing new tools and frameworks, inspiring a culture of continuous improvement and experimentation. Success will be measured by the delivery of high-impact solutions, stakeholder satisfaction, and the growth of the team. This is a permanent role based at the RSSB office in Fenchurch Avenue with hybrid working. In-office days will be based in the City of London, supported by a commuting travel subsidy benefit. The close date for the role is 11th December 2025. What you''ll do: Promote RSSB''s Data Science and AI capabilities internally and externally, positioning the team as a trusted partner and thought leader. Identify and prioritise opportunities for AI enabled digital solutions by engaging with both external partners and internal subject matter experts. Lead the team in navigating complex, ambiguous, and novel challenges, making informed decisions in situations with incomplete information. Drive the development and delivery of Machine Learning (ML) and AI solutions, acting as technical lead and ensuring alignment with