The Senior Payroll Manager will act as the internal payroll tax subject matter expert, partnering closely with HR (Benefits, Compensation, Global Mobility), as well as Finance and Legal.

Responsibilities

Payroll Production & Leadership

• Manage and support the end-to-end delivery of bi-monthly US, Puerto Rico and expatriate payroll in Workday, ensuring accuracy, timeliness, and strong controls
• Provide leadership, coaching, and development for the payroll team
• Partner with Finance and internal stakeholders to collect, validate, and process payroll inputs each pay period (e.g., deferred compensation, referral bonuses, taxable benefits, 401(k))

Payroll Tax, Compliance & Mobility (SME)

• Serve as the internal payroll tax and compliance SME, including deep knowledge of:
• multi-state and multi-jurisdictional taxation (US domestic and international cross-border)
• wage reporting, taxable income treatment, and employment tax rules
• employee mobility (remote work, multi-state workers, business travelers, domestic/international assignments)
• US Citizens worldwide wage and tax requirements
• Evaluate the payroll and tax impact of employee mobility and ensure appropriate reporting/withholding treatment
• Monitor changing federal/state/local regulations; assess business impact and lead implementation of policy, process, and system updates

Controls, Reconciliations, Year-End & Audits

• Manage quarterly and annual processes including tax filings, reconciliations, and W-2 production
• Lead the W-2 process with the vendor, including review of additional earnings and validation of accuracy/timeliness
• Oversee internal and external audits and compliance reporting (including 401(k) and Workers’ Compensation)
• Design, enhance, and monitor payroll controls, reconciliations, and review processes; ensure audit-ready documentation

Vendor, Systems & Projects

• Manage third-party payroll/tax vendors (registrations, tax notices, quarterly/annual reconciliations, filings, and payments)
• Partner with HRIS/HR Systems teams on Workday Payroll updates, releases, testing plans, and post-release validations
• Drive operational efficiency via process improvement, automation, and KPI development
• Respond to employee inquiries and develop employee communications as needed
• Produce routine and ad hoc reporting and support special projects as required

Qualifications

• Bachelor’s degree required (Accounting/Finance or another business-related field preferred)
• 10+ years of multi-state payroll management experience in a complex business environment
• Deep expertise in employment taxes, wage reporting, and multi-jurisdictional taxation (including mobility/expatriate considerations)
• Thorough understanding of full-cycle payroll and the ability to explain payroll impacts to the general ledger/accounting
• Proven ability to research, interpret, and implement regulatory changes
• Workday Payroll experience required (experience with other large-scale payroll platforms a plus)
• Advanced proficiency in Microsoft Excel
• Strong communication skills (verbal and written); comfortable presenting to and partnering with senior stakeholders
• Proven experience with vendor management, project management, and driving process improvements
• Highly detail-oriented, strong ownership mindset, and able to operate effectively under tight deadlines while maintaining confidentiality

Benefits

Millennium is a total compensation organisation where you will be eligible for a base salary, discretionary performance bonus, and a comprehensive benefits package. The estimated base salary range for this position is $160,000 to $250,000, which is specific to New York and may change in the future. When finalising an offer, we take into consideration an individual’s experience level and the qualifications they bring to the role to formulate a competitive total compensation package

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This role partners with stakeholders to translate business needs into scalable Workday solutions and drive continuous process improvement.

Responsibilities

• Configure and maintain Workday Payroll (earnings, deductions, tax elections, pay groups, payroll inputs, and validations) to ensure efficient payroll processing.
• Configure and support Workday HCM, Benefits, Time Tracking, and Absence, including business processes, condition rules, eligibility rules, notifications, and security roles.
• Own end-to-end payroll-related workflows in Workday, partnering with Payroll to reconcile results, troubleshoot issues, and ensure compliance with applicable regulations.
• Support and coordinate Workday releases and new feature enablements: review release notes, assess impact, configure updates, and manage testing and sign-off.
• Build and maintain Workday reports and calculated fields across supported modules
• Serve as a Workday subject matter expert and escalation point for stakeholders; provide guidance on best practices and recommend process and configuration improvements.
• Develop and maintain documentation (process flows, SOPs, job aids) and deliver training to end users to enhance adoption and effective use of Workday.

Qualifications

• 5+ years of hands-on Workday experience, with significant configuration and support experience in Workday Payroll.
• Experience supporting multi-state or multi-jurisdiction payroll environments preferred.
• Experience in the financial services industry is a strong plus.

Technical Skills

• Strong Workday Payroll configuration skills (earnings/deductions, taxes, pay groups, payroll processing and auditing).
• Experience configuring and supporting Workday HCM and at least two of: Payroll, Benefits, Learning, Talent, Time Tracking & Absence.
• Proven experience with business processes, security groups, calculated fields, and advanced reporting
• Experience with EIBs and vendor integrations (especially payroll and benefits related) strongly preferred.

Soft Skills

• Strong analytical and problem-solving skills; high attention to detail and data quality.
• Excellent communication skills, with the ability to explain complex payroll and system concepts to non-technical stakeholders.
• Ability to manage multiple priorities, meet deadlines, and work collaboratively in a fast-paced environment.

Preferred Qualifications

• Workday Pro certification or relevant Workday Payroll training.
• Prior experience in a financial services organisation using Workday.
• Participation in at least one Workday implementation or major enhancement project involving Payroll.

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As a subject matter expert with a proven leadership record, the Sr Global Payroll Manager is expected to drive new payroll initiatives, including system integrations and leveraging cutting-edge automation and AI tools to scale payroll processes for maximum efficiency and business continuity.

Responsibilities:

• Lead, mentor, and coach the payroll team to ensure their continuous development and operational excellence, building a world-class payroll function.

• Conduct comprehensive review and audit of global payroll processes, leveraging systems like Workday and ActivPayroll to ensure accuracy, compliance, and proper funds reconciliation across all regions.

• Manage global equity (RSUs, Options, Performance-based grants) processing in all regions.

• Champion system and process improvements within Workday and other platforms, partnering closely with People Operations and other teams to ensure full system utilization, establish best practices, and drive efficiency gains and business continuity.

• Actively identify, evaluate, and implement new payroll technologies, including AI and advanced automation use cases, to enhance accuracy, compliance, and scalability of global payroll operations.

• Provide guidance in managing US third-party fulfillment vendor to ensure tax compliance and funds reconciliation.

• Execute special projects cross-functionally that support the growth of the business, such as Workday enhancements, system integrations, international growth, and M&A.

• Develop and maintain global payroll policies, processes, procedures, and related internal controls to ensure compliance, maximum efficiency, and standardization for continuity.

• Ensure global regulatory filings are completed timely and accurately; support and coordinate audits such as worker compensation, 401K, and annual financial audit, as necessary.

Qualifications:

• Bachelor’s degree or equivalent experience in payroll.

• 10+ years’ experience in progressive payroll positions in high-growth, public and multinational companies, with a demonstrable track record of leadership and strategic process improvement.

• Experience working in a publicly traded, high-tech, high-growth company where equity compensation (i.e., RSU, stock options, and ESPP programs) is common.

• Proactive, strategic leader focused on driving continuous process improvements for efficiency and long-term business continuity.

• Extensive proficiency with Workday Payroll, including reporting, system configuration and enhancements.

• Intermediate to advanced level of proficiency using Excel or Google Sheets.

• Excellent communication skills, both written and verbal; excellent customer service and problem-solving skills.

• Ability to exercise good judgment and discretion as it relates to confidential and sensitive company and employee data.

• Able to operate in a fast-paced, hyper-growth environment by managing priorities and concentrating on accuracy.

• Understanding of emerging technologies like AI/Machine Learning and their potential application within the payroll and finance domain.

Benefits:

• Comprehensive Healthcare Benefits and Income Replacement Programs

• 401k with Employer Match

• Global Benefit programs that fit your lifestyle, from workspace to professional development to caregiving support

• Family Planning Support

• Gender-Affirming Care

• Mental Health & Coaching Benefits

• Flexible Vacation & Paid Volunteer Time Off

• Generous Paid Parental Leave

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Location

San Francisco

Employment Type

Full time

Department

Finance

Compensation

• $180K – $200K • Offers Equity

The base pay offered may vary depending on multiple individualized factors, including market location, job-related knowledge, skills, and experience. If the role is non-exempt, overtime pay will be provided consistent with applicable laws. In addition to the salary range listed above, total compensation also includes generous equity, performance-related bonus(es) for eligible employees, and the following benefits.

• Medical, dental, and vision insurance for you and your family, with employer contributions to Health Savings Accounts

• Pre-tax accounts for Health FSA, Dependent Care FSA, and commuter expenses (parking and transit)

• 401(k) retirement plan with employer match

• Paid parental leave (up to 24 weeks for birth parents and 20 weeks for non-birthing parents), plus paid medical and caregiver leave (up to 8 weeks)

• Paid time off: flexible PTO for exempt employees and up to 15 days annually for non-exempt employees

• 13+ paid company holidays, and multiple paid coordinated company office closures throughout the year for focus and recharge, plus paid sick or safe time (1 hour per 30 hours worked, or more, as required by applicable state or local law)

• Mental health and wellness support

• Employer-paid basic life and disability coverage

• Annual learning and development stipend to fuel your professional growth

• Daily meals in our offices, and meal delivery credits as eligible

• Relocation support for eligible employees

• Additional taxable fringe benefits, such as charitable donation matching and wellness stipends, may also be provided.

More details about our benefits are available to candidates during the hiring process.

This role is at-will and OpenAI reserves the right to modify base pay and other compensation components at any time based on individual performance, team or company results, or market conditions.

About the Team

OpenAI Finance is responsible for ensuring the organization is set up for success in pursuit of its mission.

OpenAI’s Payroll team is responsible for timely and accurate processing of payroll and ensuring compliance with all statutory regulations.

About the Role

At OpenAI, payroll is not a back-office function — it is mission-critical infrastructure. We are seeking a seasoned US Payroll Operations expert to scale, and continuously improve the payroll and payroll-support ecosystem that serves one of the fastest-growing and most technically sophisticated organizations in the world.

This role is based in San Francisco, CA. We use a hybrid work model of 3 days in the office per week and offer relocation assistance to new employees.

In this role, you will:

• Execute end-to-end payroll processing for bi-weekly payroll cycles, ensuring accuracy, timeliness, and compliance across multiple jurisdictions.

• Review and validate employee data changes (new hires, terminations, compensation changes, time and attendance inputs) to ensure payroll accuracy.

• Proactively identify and resolve payroll discrepancies, working directly with employees and internal partners to troubleshoot and prevent recurrence.

• Manage employee payroll support inquiries with a high degree of professionalism, clarity, and service orientation.

• Lead day-to-day workflows with outsourced payroll/BPO partners to ensure SLAs are met, quality standards are upheld, and escalations are handled efficiently.

• Partner closely with HR and other cross-functional teams to ensure clean upstream inputs and accurate downstream reporting.

• Maintain documentation, process maps, and internal controls to support audit readiness and compliance.

• Recommend process improvements and identify automation or efficiency opportunities to drive continuous improvement in payroll operations.

You might thrive in this role if you have:

• 6+ years of progressive experience in payroll operations, preferably in a fast-paced or high-growth environment.

• Strong working knowledge of U.S. federal, state, and local payroll regulations, tax requirements, and standard payroll practices.

• Hands-on experience with Workday Payroll or other large HCM/payroll systems; ADP or SmartCompliance experience is a plus.

• Ability to independently manage priorities, take ownership of outcomes, and deliver high-quality work under tight deadlines.

• Strong analytical and problem-solving skills with excellent attention to detail.

• Clear and concise communication skills, with the ability to partner effectively with internal and external stakeholders.

• Bachelor's degree in Finance, Accounting, HR, or a related field, or equivalent practical experience. CPP certification is a plus.

About OpenAI

OpenAI is an AI research and deployment company dedicated to ensuring that general-purpose artificial intelligence benefits all of humanity. We push the boundaries of the capabilities of AI systems and seek to safely deploy them to the world through our products. AI is an extremely powerful tool that must be created with safety and human needs at its core, and to achieve our mission, we must encompass and value the many different perspectives, voices, and experiences that form the full spectrum of humanity.

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