Interim FP&A Lead

Itrs Insights; Greater London; Hybrid; GBP 70,000 - 100,000; Full time

Job summary

ITRS is seeking an Interim FP&A Lead to strengthen the Group FP&A team during a transformation. You will lead core reporting, forecasting and management accounting while improving underlying data and processes. The role reports to the Global Head of FP&A and collaborates with senior leaders and PE investors.

This is a highly visible, board-facing position with immediate impact, requiring hands-on leadership and a drive to standardise processes across a growing, multi-entity environment.

Qualifications

• Qualified accountant (ACA/ACCA/CIMA) with 3–5 years post-qualified experience.
• Advanced Excel and financial modelling skills; strong P&L, balance sheet and cash flow modelling.
• Experience with variance analysis and monthly reporting to leadership.

Responsibilities

• Lead monthly reporting, management accounts, KPI schedules and Board materials.
• Perform variance analysis against budget, re-forecast and prior year with narrative.
• Drive budgeting, forecasting and long-range planning across P&L, balance sheet and cash flow.
• Build robust financial models including scenario analysis and 3–5 year plans.
• Partner with commercial and operational leads to translate financial data into actionable insight.

Skills

Excel

Financial modelling

Variance analysis

Management accounting

Education

ACA/ACCA/CIMA

Tools

Salesforce

Power BI

SQL

Job description

At ITRS, we make society's critical technology work. Our mission is to deliver automated and holistic IT observability solutions that safeguard critical applications and enable innovation. We are the only monitoring and observability platform designed for the most demanding and regulated industries — trusted by 90% of Tier 1 capital markets firms.

We believe when our team thrives, so do our customers. With us, you'll find:

• A culture that backs you– We're proud to be a Great Place to Work for multiple years in a row due to our inclusive, supportive environment.
• Work that matters– Make a real difference with 1,000s of global customers in industries that keep the world running, including 9 out of 10 top investment banks.
• Room to grow– Whether you're starting your career or bringing years of experience, we're committed to your development. Just ask our team members who've been excelling here for 10+ years.

With headquarters in London and teams across the US, Europe, and Asia, ITRS combines the agility of a high-impact tech business with the stability of a private equity–backed global partner.

Scope of Role

We are looking for a hands-on Interim FP&A Lead to strengthen the Group FP&A team during an exciting period of transformation. This is a genuinely varied role: you will lead core reporting, forecasting and management accounting deliverables while helping us improve the data and processes that sit underneath them.

Our systems landscape is evolving. We are upgrading the ERP, we are bringing ARR data across Salesforce and spreadsheets in line, and employees still run much of the daily actions in Excel. We are looking for someone who enjoys working in that kind of environment - turning complex, incomplete data into something accurate and decision-ready, and shaping the finance department as it m

You will report into the Global Head of FP&A and work with the wider finance team, commercial and operational leaders, the executive team and our PE investors.

This is a highly visible role with direct exposure to senior leadership and the Board, and a great opportunity to make an immediate, tangible impact.

As an Interim FP&A Manager, you will:

Core FP&A and management accounting

• Monthly reporting and management accounts:lead the preparation and enhancement of monthly management accounts, KPI schedules and Board materials, working along side the financial accounting team.
• Variance analysis:deliver monthly variance analysis against budget, re-forecast and prior year — explaining the drivers, not just the numbers — including headcount variance narratives.
• Budgeting, forecasting and planning:lead main components of the group's budgeting, forecasting and long-range planning cycles across P&L, balance sheet and cash flow.
• Financial modelling:build and maintain robust models, including scenario and sensitivity analysis and 3–5 year plans that can be updated at speed as the outlook changes.
• Business partnering:support commercial and operational leaders on cost management, business cases and post-investment reviews, translating financial data into clear, actionable insight.

Data and process improvement

A meaningful part of your work will involve getting into the detail to improve the data and processes behind our reporting. Priority areas include:

• ARR and revenue integrity:reconcile ARR between Salesforce and spreadsheets, help establish a clean, trusted source of truth, and reconcile recurring revenue to GAAP revenue. This is one of several improvement workstreams and an important early priority.
• Management information:strengthen and standardise reporting that is manual or fragmented, improving accuracy and repeatability.
• Process improvement:streamline month-end, forecasting and reporting workflows, reduce manual effort and document what you build so it lasts beyond the engagement.
• Working with evolving systems:deliver accurate, reliable outputs while our tech stack matures, using Excel as the primary workhorse today.

Requirements

• Qualified accountant (ACA / ACCA / CIMA), with 3–5 years post qualified experience.
• Excel and financial modelling skills- advanced formulas, comfortable building and auditing models across P&L, balance sheet and cash flow. This is central to the role
• Solid management accounting grounding- relative experience month-end, accruals, variance analysis and the mechanics behind the numbers.
• Experience working with large and complex datasets — cleaning, reconciling and validating data from multiple sources.
• Experience presenting complex financial information to finance and non-finance audiences, including PowerPoint / management decks.
• Available at short noticefor an interim engagement.

Advantageous

• SaaS experienceand fluency in recurring-revenue metrics (ARR, gross/net retention, CAC, CLTV, and cohort analysis).
• PE / VC-backed and multi-entity, multi-currencyenvironment experience.
• Salesforce, Power BIor comparable BI / data-visualisation tools.
• Data querying (SQL / Databricks)and comfort with a modern data stack.
• Experience with AI tools such as Claudeto automate reporting and analysis. We are building toward a modern, technology-enabled finance team, so enthusiasm here is welcome.

ITRS is an Equal Opportunity employer and Inclusion is part of our everyday life. We celebrate diversity and pride ourselves on providing an environment where all employees can be their authentic selves and have a voice, allowing everyone to contribute equally. We remain committed to advocating inclusion, diversity, and equality into our ITRS family as we grow and enrich our business.

We welcome applications from everyone in the community as we recognise that a diverse workforce is a stronger workforce.