.We aspire to generate a change in the company that reinforces its commitment to society and the planet, with ethical and sustainable management. To this end, we are working to ensure that sustainability becomes one of the dimensions of Telefónica's excellence, anticipating changes and new demands from society, mitigating risks, and taking advantage of business opportunities that guarantee Telefónica's long-term success.We are committed to achieve this scenario based on a work characterized by innovation, efficiency, ethical commitment, transversality, and excellent management of the talent of the people who make up the team.Telefónica is a pioneer in sustainability, an example of this is that we have obtained numerous recognitions from relevant organizations, for example, DJSI (Top 10 telcos worldwide in the CSA and in second place in DJSI Europe), Digital Inclusion Benchmark (2nd company worldwide), Sustainalytics ESG Rating (94th percentile in the sector), CDP (A), Ranking Digital Rights (1st in the telco sector), etc. In addition, we took on ESG challenges such as committing to become a Net Zero company by 2040.General Description:- The open position is within the ESG Strategy & Reporting Corporate Department, which is one of the 4 areas reporting into Telefonica's Chief Sustainability Officer.- The main missions of the ESG Strategy and Reporting Corporate Department are to report transparently to stakeholders on the company's sustainability performance and to design, develop and implement strategies to take advantage of opportunities and mitigate ESG risks.Main functions:The Sustainability Expert we are looking for will participate in various projects related to the company's ESG internal control & transparency when reporting information. Specifically, the functions will include:Periodic update of the sustainability reporting scope (ESG perimeter).Support in the coordination, preparation and updating of internal control documentation (flowcharts, narratives and risk and control matrices). Support in the identification of risks and design of controls, determining the periodicity, the associated IT systems, the assertions they cover, their characteristics (preventive or detective, manual or automatic and key or non-key).Analysis and preparation of documentation that includes and explains the recommendations of the verifier or internal auditor. Subsequent follow-up and support in case of clarifications. Proposal of action plans if necessary.Assistance in the elaboration of a corporate guide on best practices when implementing the ICSR (Internal Control over Sustainability Reporting).Support in the digitalization of sustainability reporting scope (ESG perimeter) and internal control documentation.Adaptation of the reported sustainability information including the reporting scope (ESG perimeter) to the CSRD (EU - Corporate Sustainability Reporting Directive)