Accounting & Office Manager

Supersonik; Barcelona; On-site; EUR 40,000 - 56,000; Full time

Benefits offered by this job

Factorial card

Great Barcelona office

In-person work in Barcelona

Job summary

Supersonik is seeking an Accounting & Office Manager to own day-to-day accounting, AP/AR, and back-office operations in Barcelona. You will also handle office administration, vendor management, and basic HR tasks. A proactive, autonomous mindset helps drive process improvements in a fast-paced startup.

Fluent Spanish and advanced English are required, along with strong Excel and general office tool skills. Experience in SaaS or tech is a plus, and the role is based in Barcelona with in-person

Qualifications

• 2-5 years of experience in accounting, AP/AR, or finance support roles.
• Hands-on with supplier follow-up, supplier payments, and customer invoicing.
• Solid grounding in accounting fundamentals.
• Fluent Spanish and advanced English for internal and external comms.
• Proficient with Excel and general office tools.

Responsibilities

• Accounts Payable & Supplier Management: chase, collect, validate invoices; manage full AP cycle.
• Accounts Receivable & Customer Invoicing: issue invoices and track collections.
• Accounting Support: bank reconciliations, month-end close prep, coordinate with externals.
• Office Management & Administration: vendor relations, contracts, HR/admin tasks.

Skills

Autonomous and proactive

Excel proficiency

Organizational skills

Attention to detail

Spanish (native)

English (advanced)

Tools

Odoo

Ramp

Job description

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 operations and administrative processes
• Manage internal documentation, contracts, and records
• Coordinate 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 efficiency

Who we're looking for

• Autonomous 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 roles
• Hands-on experience with supplier follow-up, supplier payments, and customer invoicing
• Solid grounding in accounting fundamentals
• Comfortable working with financial and administrative processes
• Native Spanish and at least advanced English required, for both internal and external communications
• Proficiency in Excel and general office tools
• Strong organization and attention to detail, with the ability to manage multiple priorities and deadlines independently

Nice to have

• Hands-on experience with Odoo and Ramp (or similar ERP and spend management tools)
• Experience in a startup or scale-up environment, ideally in SaaS or tech

Recruiting process

• As part of our selection process, shortlisted candidates will complete a live practical assessment to demonstrate their experience

Benefits

• Impact: Be part of our startup journey from day one, playing a key role in our growth and building something meaningful from the ground up
• Factorial card: Flexible 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 in Barcelona and work in-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.