US Senior Payroll Administrator

US Senior Payroll Administrator Salary: 45-60k Postcode - EC4R 9AT 1-2 days in office (negotiable) Start date ASAP Permanent role Working for our client means being a trusted payroller at the centre of a fast‑paced, people‑first organisation. You'll support a global workforce by delivering accurate, compliant, end‑to‑end payroll while partnering closely with contractors, internal teams, and leadership. This role suits someone who thrives on precision, deadlines, and problem‑solving - and who takes pride in getting the details right the first time. You'll join a culture built on clarity, consistency, and collaboration, where coaching‑led leadership, transparent communication, and psychological safety are part of everyday working life. Our client's commitment to developing its people means you'll have the tools, autonomy, and support to grow your expertise while contributing to a business powering progress across the energy and infrastructure sectors. Requirements: 5+ years of US payroll experience Experience in an employee-facing capacity with good communication skills Ability to work under tight deadlines with analytical and problem-solving skills Staffing experience a plus Software experience: Microsoft Excel (pivots & v-lookup needed, macros a plus) ADP Workforce Now Bullhorn experience a plus Tempest experience a plus Responsibilities: Weekly payroll processing functions including timesheet and expense retrieval and audit/corrections, missing timesheet and approvals follow up, reconciliation between ADP and timesheet billing software, and pay cycle preview audits New hire entry, garnishment entry, and termination processing in ADP Workforce Now Monitor inbox and respond to contractor payroll questions, verifications of employment, unemployment claims, and any other requests for payroll assistance Calculate and request off-cycle payments as needed Assist with Quarter end and Year end ADP preview audits Participate in unemployment hearings as needed Assist with new tax jurisdiction set up as needed Assist manager and team with any ad hoc reports or projects as needed Ensures compliance with all applicable local, state, and federal wage and hour laws, and maintaining current knowledge of applicable state and federal laws and regulations. Prepares and/or reviews weekly, monthly, quarterly and year-end reports (gross payroll, tax deductions, benefit deductions, W2, 1099, W3, 940, 941 etc.). Oversee compliance with statutory reporting and filing requirements including the review and/or prepare and file required returns and reports as necessary (including prevailing wage reporting). Registers with the Department of Labor, Department of Revenue, and any other required state agencies timely. Monitor the accurate processing of employee appointments, transfers, promotions, rate changes, and terminations. Support all internal and external audits related to payroll 51840JD INDPAY The Portfolio Group are acting on behalf of our client in recruiting for this position