? We’re hiring at Supersonik

Accounting & Office Manager

About the role

We 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 Responsibilities

Accounts 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 advisors

Accounts Receivable & Customer Invoicing
• Issue 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 Support
• Ensure 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 & Administration
• Oversee day-to-day office op

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