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About the Role

PhysicsX is seeking a Global Payroll Manager to own and manage US payroll, including processing, compliance, controls, and reconciliations. This role will expand to support and improve global payroll processes, aiming to build a consistent, controlled, and scalable payroll operating model across all operating countries. It's a hands-on position for someone comfortable in a fast-growth environment, focused on process improvement and understanding payroll's impact on employee experience and governance.

Responsibilities

Own the end-to-end US payroll process, ensuring accuracy, timeliness, and compliance with federal, state, and local requirements.
Manage bi-weekly payroll cycles, including inputs, changes, approvals, funding, checks, and post-payroll reviews.
Collaborate with the People team to ensure payroll data is complete, accurate, and properly authorized.
Review payroll changes such as new starters, leavers, salary adjustments, bonuses, benefit deductions, and tax adjustments.
Manage payroll compliance, including tax filings, year-end reporting, W-2s, and other statutory obligations.
Partner with benefits providers to ensure correct processing of employee deductions and employer contributions.
Support payroll treatment for relocation, mobility, equity, taxable benefits, and other employee-related payments.
Serve as the primary contact for US payroll inquiries, resolving issues promptly and professionally.
Build and maintain a robust payroll control environment with clear approval flows, segregation of duties, and audit-ready documentation.
Ensure clear separation of People and Finance responsibilities, with People owning HR master data and Finance owning payroll processing and controls.
Prepare payroll reconciliations, including payroll to GL, funding, tax liabilities, benefits deductions, and employer costs.
Support month-end close by ensuring accurate and timely submission of payroll journals, accruals, and reconciliations.
Maintain clear audit trails for payroll changes, approvals, and payments.
Support internal and external audits by providing documentation and responding to queries.
Identify payroll risks and implement practical controls to mitigate errors, delays, and compliance exposure.
Support the development of a global payroll operating model across the UK, US, Singapore, and future jurisdictions.
Standardize payroll calendars, input templates, approval workflows, reconciliations, and reporting across countries.
Partner with local payroll providers to enhance accuracy, timeliness, and consistency of payroll delivery.
Build scalable processes to support significant headcount growth across multiple locations.
Document payroll policies, procedures, and controls for repeatability, transparency, and resilience.
Support future payroll system, HRIS, and finance system improvements, ensuring accurate and controlled payroll data flows.
Create global payroll reporting for Finance, People, and leadership teams.
Partner closely with People, Finance, Legal, Tax, and external advisors to ensure payroll accuracy, compliance, and alignment with business needs.
Work with the Finance team to ensure correct reflection of payroll costs in management accounts, budgets, forecasts, and reporting.
Support employee mobility and international expansion from a payroll perspective.
Provide clear guidance to employees and internal stakeholders on payroll timelines, processes, and requirements.
Apply a continuous improvement mindset to payroll and help build a scalable payroll function.

Requirements

Strong experience managing US payroll, ideally in a multi-state environment.
Good understanding of US payroll tax, benefits deductions, statutory reporting, and year-end payroll requirements.
Experience working with external payroll providers and HRIS/payroll systems.
Strong understanding of payroll controls, reconciliations, and audit requirements.
Ability to work closely with People, Finance, Legal, and external advisors.
Excellent attention to detail and ability to manage deadlines in a recurring payroll cycle.
Strong communication skills and ability to explain payroll matters clearly to non-payroll stakeholders.
Comfortable working in a fast-growth, scaling company where processes are still being built and improved.
High level of discretion and professionalism when handling confidential employee information.

Skills

US Payroll Management
Payroll Compliance
Payroll Controls
Payroll Reconciliations
HRIS/Payroll Systems
External Payroll Provider Management
Statutory Reporting
Year-End Payroll Requirements
Communication Skills
Attention to Detail
Process Improvement
Global Payroll Support (Nice to Have)
Technology/Engineering/SaaS/Start-up Environment Experience (Nice to Have)
Employee Mobility/Expatriate Payroll (Nice to Have)
Payroll Accounting/Month-End Close Support (Nice to Have)
Payroll System/Workflow Improvement (Nice to Have)
CPP or similar payroll qualification (Nice to Have)

Location

New York

Work Type

Hybrid

Experience Level

Experienced Professional

Education Level

CPP or similar payroll qualification (Nice to Have)

Salary/Compensations

$100,000 - $190,000

Benefits

Equity options
5% contribution to 401(k)
Free team lunch 1x/week
Private health insurance
Enhanced parental leave (3 months full pay paternity, 6 months full pay maternity)
20 days of Annual Leave (+ Public Holidays)
Personal development support
Subsidized Gympass / Wellhub (for employee and up to 3 family members)
Flexible Spending Account (FSA)

About the Company

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.
Build what actually matters: Help shape an AI-native engineering company at a formative stage, tackling problems that genuinely matter for industry and society. This is work with real-world impact.
Learn alongside exceptional people: Work with a high-caliber, collaborative team of engineers, scientists, and operators who care deeply about doing great work and helping each other improve.
Influence over hierarchy: We operate with a flat structure where good ideas win, and questioning assumptions is expected.
Sustainable pace, long-term ambition: We believe in balancing focused, ambitious work with a life beyond it.

Equal Opportunity

We value diversity and are committed to equal employment opportunity regardless of sex, race, religion, ethnicity, nationality, disability, age, sexual orientation or gender identity.
We strongly encourage individuals from groups traditionally underrepresented in tech to apply.
To help make a change, we sponsor bright women from disadvantaged backgrounds through their university degrees in science and mathematics.
We collect diversity and inclusion data solely for the purpose of monitoring the effectiveness of our equal opportunities policies and ensuring compliance with UK employment and equality legislation. This information is confidential, used only in aggregate form, and will not influence the outcome of your application.