Kirsten is a Fractional CFO for investor-backed SaaS and AI businesses — ICAEW (ACA) and US CPA qualified, with two decades of experience spanning Big 4 firms, international roles, and senior finance positions in PE and VC-backed scale-ups. She is the founder of SaaS Scaler.
She currently works with 3 clients ranging from pre-revenue to £6M ARR, embedding herself as a strategic finance partner. Based near Liverpool, UK, she works remotely across multiple time zones and currencies.
Across Big 4, industry, and fractional roles
Current client ARR range: £0K–£6M
EY, KPMG, Deloitte — rigour at the core
I embed myself in your business as your Fractional CFO — typically one or two dedicated days per week — working alongside your existing team to bring strategic financial leadership without the cost of a full-time hire.
My clients are typically SaaS and AI businesses with up to £10M ARR that are scaling internationally and need someone who understands subscription economics, investor expectations, and the operational reality of building a business.
P&L restructuring and consolidated reporting across multi-entity, multi-currency businesses.
Budgets, reforecasts, and scenario planning in Excel and Fathom.
The numbers, narratives, and slides that go to your board and investors.
ARR, MRR, GRR, NRR, LTV, CAC, and unit economics — calculated and reported correctly.
Numbers, story, and data room in shape before you go to market.
Xero, NetSuite, AccountsIQ, chart of accounts design, and process automation.
Started in Big 4 tax — working across UK, US, and Japanese tax in my early twenties.
Moved into senior finance roles at PE and VC-backed SaaS scale-ups.
Continued Big 4 career, building deep technical rigour across international tax and compliance.
Founded SaaS Scaler — bringing Big 4 rigour and hands-on scaling experience to fractional clients.
That combination — Big 4 rigour, international experience, and hands-on scaling work — is what I bring to every client engagement.
I'm not a consultant who sends a report and disappears. I become part of your team. I have dedicated days for each client, join your Slack, attend your board meetings, and work directly in your systems.
One or two dedicated days per week — focused, consistent, and deeply embedded in your business.
Focused enough to go deep, broad enough to bring pattern recognition from across the SaaS landscape.
Clean reporting. Clear metrics. Confident decisions. That's what good finance infrastructure gives you.
Understanding the right metrics — and calculating them correctly — is the foundation of investor-ready SaaS finance. Here's the core framework I apply across every client engagement.
Annual & Monthly Recurring Revenue — the heartbeat of your SaaS business.
Gross & Net Revenue Retention — the clearest signal of product-market fit and expansion.
Lifetime Value vs. Customer Acquisition Cost — the unit economics that determine scalability.
How long it takes to recover acquisition costs — critical for cash flow planning.
Actively attending events and building relationships with founders and investors across the Liverpool and North West UK startup ecosystem.
I use Claude for research, analysis, and writing support — but maintain healthy scepticism about where AI adds genuine value. The best finance leaders will use AI as a tool, not a replacement for rigorous thinking.
My clients are SaaS and AI founders who are past the early chaos and starting to scale — but who don't yet have the financial infrastructure to match their ambitions.
You've found product-market fit and you're growing — but your finance function hasn't kept pace with the business.
You're operating across multiple currencies, entities, or jurisdictions and need someone who's done this before.
You have investors to report to, or you're preparing to raise — and you need your numbers to tell a compelling, credible story.
You want someone who sits at the leadership table, challenges assumptions, and helps you make better decisions with your numbers.
If you're a SaaS or AI founder with revenue up to £10M ARR and you need strategic finance leadership, I'd love to hear about your business. Book an intro call to see if we're a good fit.
A no-pressure conversation to understand your business and see if there's a fit.
Follow along for regular posts on SaaS finance, fractional CFO insights, and what I'm learning.
ICAEW (ACA) · US CPA · 20 years across Big 4, international markets, and VC-backed scale-ups. Helping SaaS and AI founders build the financial infrastructure they need to scale with confidence.