Head of Finance | B2B SaaS Start-up

Harmonic, Inc.; City of Westminster; Remote; GBP 50,000 - 70,000; Part time

Job summary

A leading SaaS company in the United Kingdom is seeking an experienced Financial Controller to manage financial records and operations. You will work closely with a part-time CFO, ensuring compliance and leading financial analysis for business insights. The ideal candidate is a practice trained accountant with over 2 years of experience, preferably in a SaaS environment. This role offers remote working with autonomy in decision-making.

Qualifications

• 2+ years post-practice experience in a financial role.
• Experience in a SaaS / Tech business preferred.
• Proven experience in a senior finance role.

Responsibilities

• Take ownership of financial records and ensure accuracy.
• Oversee finance operations team managing billing and payments.
• Coordinate with external partners for statutory requirements.
• Lead month-end close and prepare financial reports.
• Manage payroll and assist Accounts Assistant.

Skills

Financial reporting

Team management

Financial analysis

Regulatory compliance

Communication

Education

Practice trained qualified accountant (ACA / ACCA)

Tools

Xero

Spendesk

Job description

In this role, you'll collaborate closely with a part‑time CFO to shape the financial backbone of the business. From tightening internal controls to delivering meaningful insights through data‑driven reporting, you'll help ensure the company stays compliant, scales responsibly, and builds lasting value.

Responsibilities

• Take full ownership of our financial records and ensure their accuracy
• Oversee a lean finance operations team across billing, payments, credit control, inventory, and cash flow
• Coordinate with external partners (accountants, auditors, tax advisors) to meet statutory requirements in the UK and US
• Contribute to strategic projects and financial planning activities
• Lead month‑end close and prepare internal and external reports with the part‑time CFO
• Deliver regular financial analysis for sales updates and business reviews
• Manage payroll in collaboration with the part‑time CFO
• Oversee our financial systems (e.g. Xero, Spendesk)
• Stay on top of regulatory obligations and ensure ongoing compliance
• Guide and support the Accounts Assistant

Qualifications

• Practice trained qualified accountant (ACA / ACCA) with 2+ years post‑practice experience
• Experience in a SaaS / Tech business preferred
• Proven experience in a senior finance role
• Clear communicator able to build relationships across all levels

About the company

Harmonic is delighted to work with a Software‑as‑a‑Service (SaaS) business in their search for an experienced Financial Controller to join the team. Operating in the B2B SaaS space, our cutting‑edge platform supports a range of businesses including fast‑growing startups to global brands, helping them to streamline and enhance key operations and deliver measurable impact across teams and workflows. We have attracted major Venture Capital investors with a track record of backing some of the most disruptive and successful tech success stories of the last decade. The business is led by a highly ambitious and bright senior leadership team that promotes empowerment, ownership and accountability. Subsequently, you'll be trusted to work autonomously as a remote employee. We are building a team of smart, passionate, and ambitious people that are excited by the opportunity for growth both personally and professionally as we aim to build the next SaaS success story.