Finance Manager London, United Kingdom

PhysicsX is a deep-tech company with roots in numerical physics and Formula One, dedicated to accelerating hardware innovation at the speed of software. We are building an AI-driven simulation software stack for engineering and manufacturing across advanced industries. By enabling high-fidelity, multi-physics simulation through AI inference across the entire engineering lifecycle, PhysicsX unlocks new levels of optimization and automation in design, manufacturing, and operations — empowering engineers to push the boundaries of possibility. Our customers include leading innovators in Aerospace & Defense, Materials, Energy, Semiconductors, and Automotive.

PhysicsX is building the next generation of AI tools for engineering, partnering with some of the most advanced industrial companies in the world to transform how complex systems are designed, built, and optimised. As we scale rapidly across markets and entities, we’re looking for a Finance Manager to play a critical role in building a world‑class finance function that supports innovation, growth, and operational excellence. This is a hands‑on role with real ownership: you’ll combine strong technical accounting with commercial insight, help shape our financial infrastructure, and act as a trusted partner to leaders across the business.

• Act as the go‑to lead for our financial audits, owning the relationship with external auditors and ensuring a smooth, high‑quality process.
• Own the monthly management accounts process, including group consolidation, balance sheet reconciliations, and month‑end close.
• Continuously improve close timelines, data quality, and reporting outputs, balancing best practice with the needs of a fast‑moving startup.
• Analyse and clearly articulate the key drivers of financial performance (e.g. revenue growth, R&D spend, utilisation, and cost base evolution) to budget owners and the leadership team.

• Oversee VAT returns, HMRC filings, and statutory compliance across the UK group.
• Work closely with external advisors to develop and execute an effective tax strategy for a growing, multi‑entity, international business.
• Coordinate with US external accountants to ensure compliance with federal and state filings, supporting PhysicsX’s international expansion.
• Support R&D‑related tax matters (e.g. R&D tax credits), working with advisors where appropriate.

• Ensure AP and AR ledgers are accurate, timely, and well‑controlled by overseeing and supporting finance assistants.
• Help the business make informed working capital decisions, with clear visibility on cash, receivables, and payables.
• Drive short‑term cash flow forecasting, and manage weekly.