About ScaleWithCFO
Fractional CFO for SaaS & Tech in London
Hey, I'm Constantin
I'm a certified accountant who genuinely enjoys building financial models, cleaning up messy books, and helping SaaS founders make confident decisions with their money.
I started ScaleWithCFO because I saw the same problem everywhere: talented founders building incredible products, but flying blind on the finance side. They either couldn't afford a full-time CFO, or their accountant only showed up once a year with a tax return.
My background sits at the intersection of tech and finance. I combine deep experience in SaaS and tech financial planning with the hands-on rigour of a CIMA-qualified management accountant. That means I don't just advise - I get into your Xero, rebuild your chart of accounts, fix your gross profit margin, and build the models myself.
90% of emails answered within 2 hours
Most fractional CFOs work on day rates. You get a day or two per month, and the rest of the time you're on your own. That means when a question comes up - an investor asks for a metric, your board wants a scenario, your co-founder needs a quick sanity check - you wait.
I don't work that way. Every client gets unlimited email support, and 90% of messages are answered within 2 hours during business hours. The rest within 24 hours, guaranteed.
That's why I use a fixed monthly retainer instead of day rates. You never have to wonder whether a question is "worth" the billable time. You just ask, and you get a straight answer.
This model works because I limit the number of clients I take on. Fewer clients, deeper relationships, better results. No surprises on your invoice, no clock-watching, no holding questions until the next scheduled session.
Fixed monthly retainer
One predictable fee. No day rates, no surprise invoices, no scope anxiety.
Unlimited email support
Ask anything, anytime. 90% replied within 2 hours, guaranteed within 24.
Regular meetings
Scheduled calls to review progress, discuss strategy, and answer questions. Plus full access to my Calendly to book anytime.
Fewer clients, deeper work
Limited client roster means real attention to your business, not a production line.
Ready to get your finances under control?
Free 15-minute call. No obligation - just a straight conversation.