Data Steward - People Platforms

WPP is the trusted growth partner for the world’s leading brands. We unite cutting-edge media intelligence and data solutions, world-class creativity, next-generation production, transformative enterprise solutions and expert strategic counsel in a single company – powered by exceptional talent and our agentic marketing platform, WPP Open, to help our clients navigate change, capture opportunity and deliver transformational growth. We work with the world's most valuable brands and have global reach across 100+ markets, with deep local expertise. Our people are the key to our success. We're committed to fostering a culture of creativity, belonging and continuous learning, attracting and developing the brightest talent, and providing exciting career opportunities that help our people grow. For more information, visit WPP.com. Why we're hiring: As a Data Steward in the WPP’s Enterprise Technology Data team, you will be responsible for the hands-on administration and maintenance of master data across one or more enterprise data domains. Reporting to the Global Programme Director - Data, you will be the first line of stewardship, ensuring that golden records are accurate, source system mappings are maintained, and data governance standards are consistently applied. You will execute matching and mapping activities, triage stewardship exceptions, and support the onboarding of new source systems into the MDM framework. Your work will directly impact the trustworthiness and completeness of master data flowing through WPP’s enterprise platforms. This role involves daily data administration including investigating and resolving match conflicts, maintaining entity mappings and hierarchies, classifying data assets, and supporting the operational processes that keep master data healthy across the enterprise. You will be part of a Data Steward team led by the Global Programme Director - Data, with the opportunity to develop deep expertise in master data management, data governance, and stewardship at enterprise scale. What you'll be doing: Master data stewardship and golden record maintenance • Execute day-to-day stewardship activities including reviewing, approving, and correcting master data records in line with governance standards set by the Global Programme Director - Data. • Maintain and curate golden records, ensuring survivorship rules are correctly applied and master entities remain accurate and complete. • Investigate and resolve match conflicts, potential duplicates, and merge exceptions, escalating complex cases to the Global Programme Director - Data with supporting analysis. • Process new entity creation requests, validating source data against matching rules before golden record creation. Source system mapping and onboarding support • Manage and maintain mappings between source system entities and golden master records, ensuring traceability and accuracy. • Support the onboarding of new agencies and source systems by executing mapping activities and validating initial data loads against MDM standards. • Maintain reference data configurations, ensuring code sets and lookup values remain aligned across source systems. Data governance and classification • Apply data classification standards to master data entities as defined by the governance framework, covering sensitivity, confidentiality, and regulatory categorisation. • Review and correct AI-generated data classifications, providing feedback to improve automated tagging accuracy over time. • Follow and enforce stewardship workflows including exception handling, approval processes, and escalation procedures. • Maintain accurate documentation of entity mappings, transformation rules, hierarchy structures, and stewardship decisions. AI-assisted stewardship o