Group Financial Controller

OnSecurity is a VCT-backed cybersecurity business — 63 people, headquartered in Bristol.

Finance today is the CFO plus outsourced support.

This is a build job, not a maintenance job. You'll own everything technical and operational below the CFO — building the group finance function at the same time as the group itself gets built — plus an ERP implementation over the next 6–12 months.

If you've built a finance function from scratch, integrated an acquisition as the finance owner, and want to do it again at real pace, this is that role.

What you'll own

• Close and group consolidation — intercompany, cross-charges, eliminations
• Statutory accounts, audit and the auditor relationship
• Corporation tax, VAT, R&D claims, payroll compliance
• The ERP — chart design, configuration, cutover, and ownership afterwards
• Revenue recognition across subscription and delivered-services revenue
• The control environment across a growing group
• Integration of each acquired business onto our ledger, chart and systems
• Outsourced providers — bookkeeping, payroll bureau, acquired-entity support

Not in scope:

commercial analysis, M&A origination, board pack, investor reporting, cash collection. The CFO owns those — this role is the technical and operational engine underneath.

What we're looking for

• Qualified accountant — ACA or ACCA preferred
• Track record of building a finance function, not maintaining one — you've designed the close, written the controls, fixed what was broken
• Direct experience integrating an acquisition as the finance owner — taking an acquired ledger, mapping it to a new chart, bringing it into a group close
• Have run multi-entity consolidation yourself , including intercompany and eliminations
• Exposure to two or more entities, or two or more organisations, at FC level or one below
• Revenue recognition experience across both subscription and point-in-time delivery
• Led a system implementation end-to-end — selection through to cutover (any platform)
• Uses AI deliberately in finance workflows — and can show us what you've built, not just talk about it
• PE or VCT-backed business background

Where you'll fit best

You've likely been an FC, Head of Finance, or a strong number two at a PE- or VC-backed buy-and-build platform, roughly £10m–£40m revenue, in services or tech, with two or more acquisitions behind you. Small enough that you built the process rather than inherited a team.

We welcome applicants from cyber, IT and managed services, professional services, agencies, hybrid software-and-services, and TIC backgrounds — the pattern of building group finance through acquisition transfers well across all of them.

Why OnSecurity

We're at an inflection point — M&A strategy in motion, a real ERP decision ahead, and a finance function that needs someone to build it rather than run it as-is. You'll have direct exposure to the CFO and the wider leadership team, genuine ownership of the systems and processes you design, and a live, fast-moving buy-and-build story to build your career on.

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