The Role
Own day-to-day accounting operations, including accounts payable, supplier payments, customer invoicing, reconciliations, collections, tax compliance support, documentation, and month-end close assistance. Manage office administration, vendor relationships, company records, onboarding logistics, and internal processes. The role requires autonomy, strong organization, accounting fundamentals, and collaboration with external accountants and auditors in an in-person startup environment.
Summary Generated by Built In
🚀 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.
Skills Required
- 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
- Comfort working with financial and administrative processes
- Native Spanish proficiency
- Advanced English proficiency
- Proficiency in Excel and general office tools
- Strong organization and attention to detail, with ability to manage multiple priorities and deadlines independently
- 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
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The Company
What We Do
Supersonik is reshaping how B2B SaaS companies sell their software. Our AI Agents deliver instant, personalized, interactive, and multi-language product demos at scale, combining the discovery, qualification, and demonstration steps for a faster sales cycle and increased revenue. We’re replacing outdated sales cycles with smart, dynamic AI-driven experiences, and we’re just getting started.
