Senior Financial Controller | AI Tech Scale-Up | London (Hybrid)

The Client Harmonic is delighted to be partnering exclusively with one of the UK’s most exciting Tech scale‑ups, who are at the cutting edge of utilising AI & ML to revolutionise their sector. Led by a prominent figure in the AI and start‑up scene, they have ambitious plans to double revenues by the end of next year through the launch of new products and expansion into fresh verticals across a £10–20 billion industry. Having recently completed a major, $50m, Series B, they’re now gearing up for a Series C raise, meaning finance will play a central role in preparing the business for its next leap in scale. It’s a rare opportunity to join a venture‑backed company that has real traction, world‑class investors, and a team obsessed with using technology to modernise a sector ripe for change.

The Role Reporting directly into the VP of Finance, this is a career‑defining opportunity for an ambitious, hands‑on Financial Controller to lead core finance operations and help shape the future of a fast‑growing, Tech scale‑up. You’ll take ownership of accounting, reporting, and financial control, while driving continuous improvement across processes and systems, with exposure to their upcoming fundraise. What's most exciting is their attitude around utilising AI across workflows; their generous investment into their people, through L&D courses and career progression plans; considerable Tech infrastructure investment and their collaborative but high‑performance, autonomous culture. This is an ideal role for someone who thrives in high‑growth environments, someone who enjoys building scalable finance processes, leading teams, and embedding best‑in‑class financial operations within a rapidly evolving business, with clear scope to progress to Head of Finance within 12‑18 months.

Key Responsibilities

• Lead the accounting team, overseeing all day‑to‑day activities including accounts payable, receivable, reconciliations, and ledger management.
• Own the month‑end close and delivery of accurate management accounts and statutory reporting.
• Partner with FP&A to provide data‑driven insights that underpin strategic decisions.
• Manage regulatory reporting, working closely with auditors to ensure compliance.
• Review and implement finance processes to make them scalable, efficient, and automation‑ready, utilising AI tools (such as Zapier, Lovable, AI agents etc) to automate FinOps.
• Collaborate with wider teams to align financial control with commercial goals.
• Manage, coach, and develop a small, high‑performing finance team. (3‑4 direct reports)

Qualified Accountant (ACA / ACCA / CIMA) with industry experience. Start‑up or scale‑up environment experience. Strong communicator, able to convey financial information clearly to non‑finance stakeholders. Proven experience of using automation or AI tools.

Location: Central London (Hybrid, 2‑3 days in office) Start Date: Flexible, considering all notice periods.

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.

Seniority level: Mid‑Senior level

Employment type: Full‑time

Job function: Finance, Accounting/Auditing, and Analyst

Industries: Financial Services, Accounting, and Technology, Information and Media