Interim FinOps Manager High-Growth Tech Business Hybrid in London

Harmonic is delighted to be partnering with a founder-led, high-growth business scaling at pace. Due to the rapid growth, transactional volumes are climbing, and both the payables and receivables ledgers need a firm hand to ensure stability. With the CFO building out the function, this is the moment to bring order to the day-to-day before the next phase of the build.

Reporting into the incoming finance lead, the Interim FinOps Manager will take ownership of the transactional finance function through a busy, unstructured period. This is a hands-on role first and foremost: the priority is to steady the ledgers, run accounts payable and receivable cleanly, and keep payment runs, invoice processing and bank reconciliations moving accurately while the wider function is stood up. An immediate priority is a clean-up of some aged debt and driving that cash back in. Initially an interim appointment, there is scope to extend as the finance build progresses.

Key Responsibilities

• Own accounts payable and accounts receivable end-to-end, keeping both ledgers clean and current.
• Manage payment runs accurately and to schedule.
• Process supplier invoices and maintain accurate transactional records.
• Perform regular bank reconciliations.
• Lead a clean-up of aged debtors, driving collection and improving cash.
• Bring structure and consistency to transactional processes ahead of a system implementation.
• Work closely with the wider team, including RevOps, on billing and collections.

Essential Experience

• Strong hands-on transactional finance experience across AP, AR, payment runs and bank reconciliations.
• A track record in credit control and recovering aged debt.
• Highly accurate and process-driven, comfortable operating without an ERP or in a low-systems environment.
• Genuinely hands-on operator who can get feet under the table quickly and bring order to a busy function.
• Available to start on 1 August on an interim basis.

Desirable Experience

• Experience setting up or improving finance processes ahead of a system implementation.
• Exposure to founder-led or high-growth businesses.
• Experience partnering with commercial or RevOps teams on billing and collections.
• Accounting Qualification (ACA, ACCA, CIMA).

Package

• Day Rate: £250-£350 per day (dependent on experience).
• Location: London / hybrid (a few days a week in office preferred).
• Duration: Full-time interim, 3-4 months initially with scope to extend.
• Start Date: 1 August.

Equal Opportunity

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.