About us 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. The Role We are looking for a Global Payroll Manager to join the PhysicsX Finance team. The immediate focus of this role will be to own and manage US payroll , including bi-weekly payroll processing, payroll compliance, payroll controls, reconciliations and coordination with our People team and external payroll providers.

Over time, this role will expand to support and improve our global payroll processes and infrastructure , helping us build a consistent, controlled and scalable payroll operating model across all countries where PhysicsX operates. This is a hands-on role for someone who is comfortable operating in a fast-growth environment, enjoys improving processes, and understands that payroll is not just a back-office process — it is one of the most important employee experience and governance functions in the company.

Key Responsibilities

US Payroll Ownership Own the end-to-end US payroll process, ensuring payroll is processed accurately, on time and in compliance with federal, state and local

Requirements

Manage bi-weekly payroll cycles, including payroll inputs, changes, approvals, funding, checks and post-payroll reviews. Work closely with the People team to ensure payroll data is complete, accurate and properly authorised.

, including tax filings, year-end reporting, W-2s and other statutory obligations.

Benefits

deductions, tax adjustments and other variable pay items.

providers to ensure employee deductions and employer contributions are correctly processed.

and other employee-related payments where required. Act as the main point of contact for US payroll queries, resolving issues quickly and professionally. Payroll Controls, Governance and Compliance Build and maintain a strong payroll control environment, including clear approval flows, segregation of duties and audit-ready documentation.

deductions and employer costs. Support month-end close by ensuring payroll journals, accruals and reconciliations are accurate and submitted on time. Maintain clear audit trails for payroll changes, approvals and payments.

Support internal and external audits by providing payroll documentation and responding to audit queries. Identify payroll risks and implement practical controls to reduce errors, delays and compliance exposure. Global Payroll Process Improvement Support the development of a global payroll operating model across the UK, US, Singapore and future jurisdictions.

Help standardise payroll calendars, input templates, approval workflows, reconciliations and reporting across countries. Partner with local payroll providers to improve accuracy, timeliness and consistency of payroll delivery. Build scalable processes that can support significant headcount growth across multiple locations.

Responsibilities

are clearly separated, with People owning HR master data and Finance owning payroll processing, review and release controls.