About fin-house

We build human-first finance teams for ambitious, fast-growth businesses. Embedded fractional teams that feel like our clients' own, from day-to-day operations to board-level strategy.

We believe finance should be a growth engine, not a back-office function. And we want our people to outgrow us. You'll grow faster here than almost anywhere else - across more industries, business models and finance levels than any single in-house role can offer

The key bits

Location: We are based in Waterloo (London) with a minimum of three days in the office a week.

Salary: £70,000 to £80,000 depending on experience

The role

Our fin-leads head up finance across a portfolio of 5-7 clients.

Forecasting, planning, and commercial insight. Challenging thinking, assessing risk, shaping decisions. Connecting day-to-day performance with long-term strategy, and building high-performing teams underneath you to scale the impact.

You're not the CFO; that's a different seat. You're the trusted finance voice in the room, turning finance into something founders actually use.

The fast track

Joining us as a fin-lead puts you on the fastest finance leadership track we know.

You'll lead finance across multiple ambitious businesses at once. The variety and depth you'll get in 18 months here would take a decade in a single in-house role. Most in-house roles want you to have experience in their sector before they'll even look at you. Here it's the opposite.

You'll work directly with founders on the conversations that actually matter: fundraising, scaling, making the hard calls.

And when you move on, you'll have led finance across five or more sectors, think SaaS, fintech, e-commerce, hospitality, climate. That's experience that's hard to build anywhere else.

Next stop: FD. After that, CFO. We'll give you the experience, the coaching and the network to get there.

What you'll lead

• Own the financial narrative across your clients - P&L, cash flow, balance sheet - translating complexity into clear guidance that founders can act on
• Own the operational backbone - AP, AR, payroll and VAT - across your portfolio, keeping clients confident that nothing slips
• Lead budgeting, forecasting and scenario planning, connecting commercial reality with long-term strategy
• Build sophisticated financial models for fundraising, M&A, and investment decisions
• Challenge assumptions, flag risks early and shape decisions, not just report on them
• Coach and develop fin-managers and fin-operators across your portfolio (typically 2-3 direct reports), building high-performing teams
• Drive systems and process improvements, setting the standard for how Xero is configured and used
• Help fin-house grow - through referrals, the relationships you build, and how you represent the brand externally

Requirements

Who you are

• You've been the sole or most senior finance person in a scaling business. You know what it means to build a finance function rather than inherit one, to advise a founder rather than a committee, and to make calls without a safety net.
• You're ambitious, not settled. You want to be a CFO or FD, and you want to get there faster than a single in-house role would allow (if you've already spent 20-plus years reaching that level, this probably isn't your next move.
• You're energised by variety, not unsettled by it. Different sectors, different stakeholders, all at once, and you thrive on the agility that takes
• You're motivated to develop people, coaching team members across your portfolio and shaping fin-house's culture of high performance
• You care about the impact finance can make, you don't just crunch numbers, you want to shape decisions and drive real business change
• You're always curious, constantly looking for ways to do things better, for yourself, your clients and the team
• You want to be part of a tight-knit culture that learns together and enjoys spending time together, not just working alongside each other

What you'll need

• Minimum 7 years' experience in an accountancy or finance role
• An accountancy qualification (ACA / ACCA / CIMA) is desirable; we'll consider strong alternative paths
• Proficient in Excel and/or Google Sheets
• Experience with Xero and/or QuickBooks is highly desirable
• Experience working with a portfolio of clients is highly desirable

Benefits

💰 Competitive salary of £70,000-£80,000 based on experience

💸 Company-wide performance-related bonus scheme

🌳 Tailored personal development plan, to help you grow

✈️ 23 days annual leave, plus bank holidays

🎂 Birthday day off - celebrate another year older and wiser however you like!

🎄 Office closed between Christmas and New Year

💝 Monthly Juno wellbeing credits to spend your way

🥂 Monthly socials with the team