Job Description
About us
Fifth Dimension is bringing the magic of AI automation to document-heavy industries 🌈. Today we work with leading real estate businesses in the UK and US, automating complex workflows, extracting valuable insights from documents, and empowering professionals to focus on high-impact work. Our AI workspace transforms how large investment managers handle leases, development documents, and investment decisions.
We're an international startup based in London, New York, and Singapore, backed by Tier 1 American and European investors. Our founders, Johnny Morris and Dr. Kate Jarvis, bring a powerful blend of expertise: Johnny has 18+ years applying data and analytics to real estate, while Kate holds a Stanford PhD and 12 years of executive experience across Silicon Valley and London startups.
At Fifth Dimension, we're demanding yet encouraging, valuing experimentation and thoughtful challenge. Our company values - Own It, Ship It, and Don't Be Boring - drive us to deliver exceptional results whilst fostering a culture of innovation and continuous improvement.
A week in the life of our Finance Manager
Monday: You're reviewing last week's ARR movement. A new logo closed Friday - you update the weekly management report, recalculate pipeline coverage, and send the snapshot to the leadership team first thing.
Tuesday: Deep in the revenue model. You're working backwards from our 2026 target: how many AEs do we need, what quota should they carry, what ACV assumptions hold at different close rates? You flag two scenarios to the FD before EOD.
Wednesday: In the office on Oxford Street. Back-to-back with the RevOps team to align on HubSpot pipeline definitions - you're building the underlying data structure that makes our FP&A meaningful, not just pretty.
Thursday: Monthly close is coming. You're reviewing the management accounts pack from our outsourced accountants, reconciling actuals to budget, and feeding updated actuals into the FP&A layer - flagging variances to the FD before the leadership review.
Friday: Unit economics. You're stress-testing LTV:CAC ratios across our customer cohorts and drafting a short brief for the FD ahead of next week's board prep.
This is finance at Fifth Dimension. You're not a passenger - you're building the function from the ground up.
What you'll do
As our Finance Manager, you'll build 5D's FP&A function from scratch — the financial infrastructure that guides every major commercial decision between now and Series B.
Day to day, you will:
Own our weekly management reporting: ARR, pipeline coverage, forecasts - built interactively and delivered to the leadership team
Build and maintain monthly management reporting: GRR, NRR, CAC, LTV:CAC, burn multiple, gross margin vs. assumption - with full P&L line items across sales & marketing, R&D, and G&A
Build our revenue model: working back from annual targets to AE headcount requirements, quota levels, ACV attainment, marketing channel investment, and stage-weighted pipeline
Maintain cap table, options register, and company secretarial tasks - working with our outsourced providers but owning the internal layer
Act as the financial interface to RevOps - partnering closely on HubSpot data integrity, pipeline definitions, and revenue operations to ensure FP&A is built on solid ground
Support fundraising and board prep when needed - building the narrative and the numbers
What we're looking for
You've done FP&A in a VC-backed, high-growth B2B SaaS business - or you've been close enough to it that you know exactly what good looks like and how to get there. You're a generalist who can context-switch between controllership and commercial analysis without missing a beat. You make confident decisions when data is incomplete, and you're always asking "what's the MVP to get us to Series B?"
You bring:
Qualified accountant (ACA, ACCA, CIMA or equivalent)
3–6 years' post-qualification experience, ideally including time in a high-growth B2B SaaS environment
Strong FP&A foundations: revenue modelling, unit economics, scenario planning, management reporting
Genuine AI literacy - you use Claude or equivalent tools heavily in your workflow; building a model without them would feel like leaving performance on the table
Generalist mindset: equally comfortable running a cap table audit, building a quota model, and presenting to the CEO in the same week
Comfort operating with incomplete data and an instinct for pragmatic, high-quality outputs over perfect ones
A growth mindset - you want to be Head of Finance or Head of FP&A in a few years, and you're going to push yourself to get there
Bonus points if you have:
Experience in proptech, real estate, or adjacent financial services
Exposure to multi-entity structures (UK parent, US / Singapore subsidiaries)
Hands-on experience with HubSpot or similar CRM from a RevOps/FP&A angle
Previous experience supporting a fundraise or investor reporting
What we offer
We're building something extraordinary — and we want extraordinary people. Our benefits package goes beyond the standard startup offering, from tailored support for life's challenges to meaningful parental leave.
£80–110k salary per annum + bonus + meaningful equity (on a standard vesting schedule) 📈
Enhanced pension contributions (5%)
Unlimited annual leave
£100 monthly wellbeing budget
£1,000 annual training budget
Electric car scheme (salary sacrifice)
Tailored support for exceptional challenges, which may include contributions to:
Gender-affirming care
Private specialists and diagnostic scans
ADHD / Autism diagnosis
IVF / fertility care
Therapy
Enhanced parental leave
14 weeks full pay for primary caregiver (followed by statutory pay)
6 weeks full pay for secondary caregiver
Flexible working — hybrid (Wednesdays in our Oxford Street office), judged on output not hours. Quarterly team weeks in London, regular travel to New York and Singapore as the business grows.
Department: Finance; Location: London; Remote status: Hybrid