Payroll Specialist- Temporary

StackAdapt is the leading technology company that empowers marketers to reach, engage, and convert audiences with precision. With 465 billion automated optimizations per second, the AI-powered StackAdapt Marketing Platform seamlessly connects brand and performance marketing to drive measurable results across the entire customer journey. The most forward-thinking marketers choose StackAdapt to orchestrate high-impact campaigns across programmatic advertising and marketing channels.

We're looking for a detail-oriented and compliance-focused Payroll Specialist to join our Finance team on a temporary basis to support a high-priority initiative involving the creation of a new US LLC, the wind-down of the existing US Branch, and the end-to-end implementation of a new global payroll provider. This role will work closely with the Finance, Legal, and People Operations teams to ensure seamless execution across all project workstreams. You'll collaborate with external advisors, payroll vendors, and internal stakeholders to meet regulatory deadlines and ensure compliance at every stage. This role reports to the Senior Global Payroll Manager.

StackAdapt is a Remote First company, we are open to candidates located anywhere in Canada for this position.

• Support the payroll and compliance workstream for the US Branch to US LLC transition.
• Assist with deregistration and final filings for the existing US Branch across ~36 state and local jurisdictions.
• Execute state and local payroll tax registrations for the new US LLC.
• Assist with payroll setup, tax configuration, testing, and initial processing under the new entity.
• Collaborate with internal teams (Tax, Legal, HR, Finance) and external partners (ADP, tax agencies) on transition deliverables.
• Track deadlines, dependencies, filings, registrations, and open items throughout the transition and identify and escalate risks or compliance gaps.
• Support the payroll implementation workstream for the migration of StackAdapt's entities to a new global payroll provider following the US LLC transition.
• Support  implementation activities including data preparation and migration, payroll configuration, integration coordination, validation, testing, parallel payroll runs, issue resolution, and go-live readiness.
• Coordinate with the global payroll provider, internal stakeholders, and payroll teams across multiple countries to ensure implementation milestones and dependencies are met.
• Maintain detailed project documentation, payroll requirements, testing results, issue logs, and implementation sign-offs.
• Support a controlled transition to the new global payroll provider while maintaining payroll accuracy, compliance, and business continuity throughout the migration.

• Knowledge of US payroll, payroll tax, and multi-state compliance requirements.
• Experience managing payroll projects, implementations, entity transitions, or similar initiatives.
• Strong project management and organizational skills, with the ability to independently manage timelines, deadlines, dependencies, and multiple stakeholders.
• Highly detail-oriented, accountable, and thorough, with a strong focus on accuracy and follow-through.
• Proven ability to take ownership of complex work from planning through execution, identify risks early, and proactively drive issues to resolution.
• Strong communication, collaboration and technical (Excel / Google worksheet) skills, with the ability to work effectively across Payroll, Finance, Tax, Legal, HR, vendors, and external stakeholders.