We’re hiring at Supersonik!Accounting & Office ManagerAbout the roleWe are looking for a highly autonomous, proactive person to take ownership of our day-to-day accounting operations, from supplier invoices and payments to customer invoicing. You will be the go-to person for keeping the finance back-office accurate, up to date, and running without needing to be chased. You will also cover office management and general admin tasks.This is a role for someone who spots what needs to be done and does it, flags issues before they become problems, and improves processes along the way. You will work closely with the Finance and Operations team, in a fast-paced startup environment with real scope for ownership.Key ResponsibilitiesAccounts Payable & Supplier Management (core focus)Own the supplier follow-up process: chase, collect, and validate invoices proactively, with no reminders needed.Manage the full AP cycle: invoice collection, supervise registration, approval workflow, and payment preparation and execution.Prepare and execute supplier payment runs, ensuring payments are accurate and on time.Reconcile supplier statements and resolve discrepancies.Review supplier and customer invoices for tax compliance (tax IDs, VAT, withholdings) and support the preparation of periodic tax filings together with our external advisorsAccounts Receivable & Customer InvoicingIssue customer invoices accurately and on time.Track collections and follow up on overdue payments.Keep customer data, contracts, and billing information up to date and consistent.Accounting SupportEnsure complete, organized documentation and filing of all financial transactions.Support bank reconciliations and expense tracking.Coordinate with external accountants and auditors,



and provide the information they need on time.Support month-end close by preparing and reviewing supporting documentation.Office Management & AdministrationOversee day-to-day office operations and administrative processesManage internal documentation, contracts, and recordsCoordinate vendor relationships (suppliers, service providers, etc.)Support basic HR/admin processes (onboarding logistics, documentation, etc.)Ensure proper organization of company files and tools (Drive, Notion, etc.)Handle general administrative tasks to support team efficiencyWho we're looking forAutonomous and proactive:you take ownership, anticipate needs, and follow tasks through to completion without close supervision.2-5 years of experience in accounting, accounts payable/receivable, or finance support rolesHands-on experience with supplier follow-up, supplier payments, and customer invoicingSolid grounding in accounting fundamentalsComfortable working with financial and administrative processesNative Spanish and at least advanced English required, for both internal and external communicationsProficiency in Excel and general office toolsStrong organization and attention to detail, with the ability to manage multiple priorities and deadlines independentlyNice to haveHands-on experience withOdooandRamp(or similar ERP and spend management tools)Experience in a startup or scale-up environment, ideally in SaaS or techRecruiting processAs part of our selection process, shortlisted candidates will complete a live practical assessment to demonstrate their experienceBenefitsImpact:Be part of our startup journey from day one, playing a key role in our growth and building something meaningful from the ground upFactorial card:Adaptable compensation for transport and restaurants!Great office in Barcelona:work positioned in one of the best neighborhoods, with a great view of the city!We are based inBarcelonaand workin-person— Not as a constraint, but by design: tight collaboration and fast learning from one of Europe’s most exciting tech hubs.If you want to be at the center of the agentic future of software, this is a unique opportunity.#J-18808-Ljbffr

📌 Accounting & Office Manager (Madrid)
🏢 Supersonik
📍 Madrid