Can you imagine your professional career being part of social change and transformation? WE’RE LOOKING FOR YOUR TALENT! At ONCE, we are seeking an Administrative Assistant for an indefinite-term position within our Technical Directorate of Social Welfare, Benefits, and Volunteering, located in Madrid. WHAT WILL YOU DO ON A DAILY BASIS? * Processing correspondence, archiving, file management, drafting proposals using the corporate desktop (SAP), managing financial documentation—including IRPF, pensions, public grants, Dependency Law, etc.—as well as providing administrative support in the areas of economic benefits, volunteering, workplace and study adaptations, and the ONCE Social Welfare Support Service, along with any other analogous tasks assigned to ensure optimal administrative management. * Performing tasks using the corporate desktop (SAP), email, and Office 365. * Providing administrative support to other teams. WHAT DO WE NEED FROM YOU? (Requirements) * Minimum qualification: Higher Vocational Training Diploma in Administration and Management. * Experience performing administrative tasks for at least three months. * Advanced proficiency in office software packages (Word, Outlook, and Excel are mandatory). * Familiarity with web environments. * Ability to handle handwritten documents (e.g., information related to benefits/financial documentation, resources, etc.), large-volume files, data tables, etc. * Strong writing skills. * Problem-solving profile with high organizational capacity. WHAT ELSE DO WE VALUE? (Desirable qualifications) * Possession of qualifications related to administrative functions and the social services field—such as Social Work, Social Education, or Labor Relations. * Prior work experience at ONCE. * Experience working in tax advisory firms or consulting/auditing companies. * Knowledge of Braille. * Participation in volunteer activities. WHAT DO WE OFFER YOU? * Indefinite-term contract. * Full-time schedule of 36 hours/week—goodbye to the standard 40-hour workweek! - Competitive base salary of €16,000 gross/year; after two years, promotion to Senior level with a salary of approximately €24,000 gross/year. * 24 working days of vacation + 6 personal days for private matters. * Annual individual training grants—we want you to keep growing! * ONCE Card: Exclusive discounts offered. * Financial assistance for childbirth or adoption. * Opportunities for anyone to participate in volunteer activities and contribute to community well-being. * ONCEInnova: We have an innovation and entrepreneurship unit where any employee can propose and participate in intrapreneurship and innovation projects within ONCE. You’ll have the chance to join a solidarity-driven, socially committed organization—FOR PEOPLE AND BY PEOPLE—that is fully aware of its societal responsibilities, supports you throughout your onboarding process, and offers opportunities for professional growth. The choice is yours—where will you go!