Interim Accounts Assistant | Creative Agency | London (On-site)

Harmonic is delighted to be partnering with a well-established creative business that delivers high-quality projects and live brand experiences for a portfolio of well-known consumer brands. They operate at the premium end of their market, where craft and quality matter, and take pride in bespoke, made-to-order work. With the finance team evolving, they are looking for a reliable Accounts Assistant to come in and keep things running smoothly through a busy period.

Reporting to and working alongside the Management Accountant, this is a hands-on, transactional finance role supporting a small, close-knit team based on-site in South West London. You will take ownership of the day-to-day accounts payable and input work: posting purchase invoices, processing timesheets, and handling company credit card and expense reconciliations, keeping the finance function moving while the team finalises its longer-term structure. It is an immediate-start temporary contract with genuine potential to extend, or to convert to a permanent role, for someone who does a great job. The business runs on Xero.

Key Responsibilities

• Post and process purchase invoices accurately and to deadline.
• Process weekly timesheets and reconcile against records.
• Manage company credit card and staff expense reconciliations.
• Support the wider accounts payable cycle, including payment runs and supplier queries.
• Keep the finance inbox and records tidy and up to date.
• Provide day-to-day support to the Management Accountant and wider finance team.
• Help keep things on track through month-end and busier periods.

Essential Experience

• Previous experience in an Accounts Assistant, Accounts Payable, or transactional finance role.
• Confident posting and processing invoices, and comfortable with the core AP cycle.
• Reliable and able to hit the ground running with minimal training.
• Strong attention to detail and clear communication.
• Available to start at short notice and to be on-site in South West London 5 days per week.

Desirable Experience

• Experience using Xero (or a similar accounting package; the core skills transfer).
• Exposure to timesheet processing, or to a project-based or creative business.

Day Rate: £150-£175 per day, dependent on experience

Contract: 3-month temporary contract, with genuine potential to extend or go permanent

Location: On-site in Wimbledon, London, 5 days per week. Well served by the District line and Overground.

Start Date: ASAP, ideally week commencing 22 September

Please feel free to get in touch with Ewan Fenley for more information.

At Harmonic, we are dedicated to fostering an inclusive and equitable workplace. We actively welcome applications from individuals of all backgrounds and assure you that every candidate will be thoughtfully considered for the roles we represent, without regard to race, religion, gender expression, disability, or sexual orientation.