Interim CFO — SaaS Scale-Up (London, Hybrid)

Harmonic Finance™ | Certified B Corp; Greater London; Hybrid; GBP 185,000 - 277,000; Part time

Job summary

Harmonic appoints an Interim CFO for a six-month engagement to lead the finance function end-to-end in a London-based B2B SaaS scale-up. You will report to the CEO and work with the board and investors, combining strategic direction with hands-on delivery.

As the senior finance leader, you will own forecasting, budgeting, cash management, controls, and monthly investor reporting, while partnering with the leadership team on strategic initiatives. Hybrid London location.

Qualifications

• Qualified accountant (ACA, ACCA or CIMA) or equivalent.
• Experience as CFO or senior Finance Director in a SaaS/tech business.
• Proven board/investor reporting experience in PE/VC-backed environments.
• Strong grasp of SaaS metrics, revenue recognition and subscription models.
• Able to step in quickly and deliver in an interim capacity.
• Multi-entity or international group experience.
• Exposure to fundraising, refinancing or exit processes.

Responsibilities

• Lead the finance function and act as the senior financial partner to the CEO and leadership team.
• Own board and investor reporting, including monthly packs and SaaS KPIs (ARR, NRR, churn, CAC payback).
• Lead budgeting, forecasting and long-range planning, and monitor cash runway.
• Review and strengthen financial controls, processes and systems to scale.
• Oversee year-end audit, statutory reporting and tax compliance across entities.
• Support fundraising, debt or M&A activity, including investor relations and due diligence.
• Manage and develop the finance team, and decide long-term needs of the function.
• Track record of board reporting in PE/VC-backed environments.
• Ensure compliance with revenue recognition for SaaS and subscription models.
• Operate in an interim capacity with cross-functional collaboration.

Skills

SaaS finance leadership

Education

Professional accounting qualification (ACA/ACCA/CIMA)

Job description

Harmonic appoints an Interim CFO for a six-month engagement to lead the finance function end-to-end in a London-based B2B SaaS scale-up. You will report to the CEO and work with the board and investors, combining strategic direction with hands-on delivery.

As the senior finance leader, you will own forecasting, budgeting, cash management, controls, and monthly investor reporting, while partnering with the leadership team on strategic initiatives. Hybrid London location.