CA

Calvin O'Callaghan

💎 DiamondVerified expert

Fractional CRO & RevOps Leader | Scaling B2B SaaS Revenue

London
Years operating
10+
Weekly capacity
3 days
Engagements
Fractional / Advisory / Interim
Best fit
Best suited for companies that need embedded senior leadership without a full-time executive hire.
Board-level strategic supportSeed to Series AGrowth-stage teamsOperator-led companies

About

Fractional CRO and RevOps leader who has helped 140+ businesses build predictable growth. Former HubSpot top-1% performer with four Presidents Clubs and two Founders Clubs. Built Centralise into an Elite HubSpot Partner ranked 19th globally, growing it to more than $300k in monthly revenue, a 20-person team and 100+ clients before exit. I specialise in founder-led B2B SaaS, GTM strategy, revenue operations, sales leadership and HubSpot.

What this leader can help with
Current context shaped by FounderProof Advisory
Engagement shape
Fractional / Advisory / Interim
Current or recent mandate
Fractional CRO & RevOps Leader | FounderProof Advisory
2026-08 - Present | C Suite

Companies looking for this kind of leader are typically buying decision support, operating cadence, and hands-on executive judgment in one engagement.

Career highlights

Representative mandates and operator context

Fractional CRO & RevOps Leader
FounderProof Advisory
2026-08 - Present
C Suite
CEO & Co-founder
Centralise
2024-07 - 2026-03
C Suite
Team Lead & L4 Growth Specialist
HubSpot
2019-08 - 2024-07
Head
Co-founder & Head of GTM
SmartRoutes
2017-08 - 2019-09
Founder
Full background

Experience

Work
Fractional CRO & RevOps Leader | FounderProof Advisory
2026-08 - Present | c-suite
Work
CEO & Co-founder | Centralise
2024-07 - 2026-03 | c-suite
Work
Team Lead & L4 Growth Specialist | HubSpot
2019-08 - 2024-07 | head
Work
Co-founder & Head of GTM | SmartRoutes
2017-08 - 2019-09 | founder
Work
Process Automation Engineer | Zenith Technologies
2015-09 - 2017-08 | senior
Work
CEO & Co-founder | FutCoinTraders
2013-06 - 2015-04 | founder