Finance Business Partner (SaaS) (London Area)

We’re looking for a highly analytical and proactive Cost FP&A Finance Partner to join our client, a PE backed SaaS platform. This role will play a critical part in managing and optimising workforce-related costs, transitioning manual cost models to automated systems, and supporting key financial planning and reporting functions across Opex, Headcount, and Capex. Key Responsibilities: Lead the development and ongoing management of large-scale workforce cost models. Transition manual Excel-based models to automated tools integrated with CRM/ERP systems. Act as a strategic partner to business stakeholders, providing insights and challenge on cost drivers to identify savings and improve financial efficiency. Collaborate with HR and business leaders on succession planning and workforce strategy from a cost perspective. Support the design and monthly reporting of commission schemes, ensuring accuracy and alignment with business goals. Deliver timely and insightful monthly reporting across key expense areas including Opex, Headcount, and Capex. Work cross-functionally with Finance, HR, and IT to improve planning processes and reporting capabilities. Key Requirements: Proven experience in a similar FP&A or cost finance role, ideally within a large or complex SaaS organisation. Strong background in managing workforce cost models, with hands-on experience transitioning from manual to system-based solutions. Demonstrated ability to challenge stakeholders constructively and influence cost management decisions. Good understanding of commission structures and the associated reporting requirements. Advanced Excel skills; experience with financial systems and tools is a strong plus. Excellent communication skills with the ability to explain financial concepts to non-finance stakeholders