Finance Lead | Series A SaaS Scale-Up | London / Hybrid

The Client

Harmonic has been retained by a venture-backed AI business at Series A, having raised significant funding from a strong syndicate of UK and US investors. The company has built a proprietary large language model purpose-built for software supply chain security, a genuinely differentiated technical product in a market where enterprise demand is accelerating. With a growing roster of enterprise clients, a compelling technical moat, and a founder preparing for US expansion, this is a business at a genuinely exciting inflection point.

The Role

Reporting into the CEO, and working closely with the CEO’s Chief of Staff, the Finance Lead will take full, sole ownership of the finance function, including complete responsibility for the cap table, EMI options scheme, and shareholder documentation. This is a hands-on role in a lean team: you will oversee month-end close and day-to-day finance operations, manage the relationship with outsourced accountants, own board and investor reporting, and bring genuine confidence and gravitas to conversations with the board and investors.

Alongside the core finance remit, you will provide ad hoc operational support as priorities require, with growing involvement in Series B preparation as that process gets underway.

Key Responsibilities

• Take full ownership of the cap table, EMI options scheme, and share allocations, coordinating with legal counsel on Companies House filings and shareholder documentation.
• Oversee month-end close and day-to-day finance operations, ensuring management accounts and reporting are accurate, timely, and audit-ready.
• Own board and investor reporting end to end, producing high-quality financial management information and presenting it with confidence directly to the board and investors.
• Manage the relationship with outsourced accountants, ensuring VAT, payroll, and statutory filings are delivered accurately and on time.
• Own budgeting, cashflow forecasting, and burn rate visibility across the business.
• Support financial planning and scenario modelling, acting as a trusted finance partner to leadership.
• Oversee US subsidiary compliance and cross-border requirements, working with legal counsel and external advisers.
• Provide ad hoc operational support alongside the CEO’s Chief of Staff as priorities require, from vendor management to process improvements.
• Take on a growing role in Series B preparation as the business scales, building the financial story, model, and diligence-readiness alongside the CEO.