(Internship | On-site | Madrid) We are looking for an Auxiliar Administrativo to help us grow our Innotaxes team in Spain. This is not just a role — it is a key opportunity to streamline our cross-border operations, directly impact efficiency, and grow within a fast-paced international tax consultancy environment.
Key Responsibilities
Document Management & Quality Control Review, classify, and digitally archive invoices and formal tax documentation for clients across multiple integral markets. Ensure all client files are fully organized, accurate, and up to date Act as a horizontal support pillar for our Account Managers (AMs), Management and Accounting Monitor deadlines closely and send timely alerts International Client Relations Proactively contact team members (covering EN, RU, JPN markets) to request and follow up on required paperwork. Maintain an exceptional standard of client coordination to prevent communication bottlenecks. Accounting & Tax Support Provide hands-on technical support by performing bank reconciliations before data is transferred to a3 software.



Deliver logistical support during high-volume periods, such as quarterly and monthly tax presentation closings.
Requirements
Hard Skills Native or C1-C2 Spanish level Minimum B2 English level Valuable prior knowledge or familiarity with a3 management software. Degree in ADE, Finance, or related Experience Minimum of 6 months to 1 year of prior experience working in a consultancy, tax advisory, or fast-paced corporate administrative environment.
Soft Skills
Exceptional attention to detail and methodical organization. Strong time management abilities and capacity to handle multiple priorities. Assertive communication and great adaptability to learn new processes.
What We Offer
Hands-on mentorship and training in real-world accounting and advanced tax management tools (a3). Continuous training and mentorship from an international team. Team-building, wellness, and creative activities. Our exciting Yearly C

📌 Auxiliar administrativo (Santander)
🏢 InnoTaxes
📍 Santander