Director of Finance & Operations | B2B SaaS | London/Hybrid

Director of Finance & Operations | Pre-Series B Mission-Led B2B SaaS | London, Hybrid

The Client

Harmonic is delighted to be working with a B Corp-certified, venture-backed B2B SaaS scale-up with a mission-led product at the heart of a large and fast-growing market. Backed by tier-one investors and trusted by tier-one enterprise clients, the business has grown to almost £12m ARR and is now approaching its Series B with strong commercial momentum and a clear position of category leadership.

The Role

Reporting directly to one of the Co-founders and sitting on the Senior Leadership Team, this is a hands-on strategic operator role with full ownership of the finance and operations function across UK and US entities. A strong Finance Manager is already in place handling day-to-day controller work: monthly close, bookkeeping, payables and receivables, and financial modelling. The Director's time is therefore weighted toward strategic FP&A, business partnering with the founders, and leading the Series B raise end-to-end.

Beyond finance, this person operates as a commercial thought partner across the business: challenging GTM leaders on headcount assumptions and pipeline coverage, co-designing sales comp and unit economics with RevOps, co-owning the annual planning cycle, and leading cross-functional strategic projects for the founders. AI automation is not optional. The business expects this person to have genuinely built and deployed AI-driven workflows in prior roles, and to set the standard for AI-native working across the finance and operations team.

Key Responsibilities

• Lead the Series B fundraise financial workstream: operating model, data room, KPI narrative, investor diligence and investor relations post-close.
• Own strategic FP&A: annual budget, rolling reforecast and a granular, bottoms-up operating model the board and founders can use to make real decisions.
• Partner with RevOps and commercial leadership to design and stress-test sales targets, quota structures, comp plans, pipeline coverage models and unit economics.
• Oversee the finance function end-to-end across UK and US entities: statutory accounts, audit, treasury, cash forecasting, FX exposure and multi-jurisdiction tax.
• Challenge the executive team on headcount, capital allocation and GTM strategy with commercial rigour and the willingness to push back when the numbers do not support the story.
• Build and deploy AI-native automation across close, FP&A, AR and operational workflows, raising the output quality of the finance function without increasing headcount.
• Lead, coach and develop the existing finance and operations team, raising both capability and AI fluency.
• Contribute to cross-functional strategic projects for the founders, including AI pricing strategy, new market entry analysis and operational reviews.

Essential Experience

• Proven track record in a senior finance operator role at a high-growth B2B SaaS business, with direct experience of a Series A or B inflection point.
• Deep commercial fluency in B2B SaaS metrics: ARR, NRR, pipeline coverage, sales capacity, CAC/LTV and unit economics.
• Demonstrated ability to challenge and partner with GTM and commercial leadership, not just report to them.
• A concrete track record of having built and deployed AI-driven automation in a finance or operations context (not just tool experimentation).
• Experience leading or materially supporting a VC fundraise, including financial modelling, data room preparation and investor diligence.
• A finance or numerically rigorous background: formal qualification (ACA, ACCA, CIMA, CPA, CFA) or a strong quantitative degree; non-traditional and non-qualified routes actively welcomed.

Desirable Experience

• Background as a VC-turned-operator, or equivalent experience spanning both investment and operating environments.
• Experience selling into or operating within a sector with complex, high-value enterprise procurement cycles.
• Exposure to US entity management, US GAAP and multi-jurisdiction tax.

Salary: £120,000 - £140,000 + Equity

Location: London (3 days in office, 2 remote)

Start Date: ASAP

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.