Senior Manager, HR Business Partner

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.

As a Senior Manager, HR Business Partner, you will lead a global team and serve as a strategic HR partner to senior leaders across our global revenue organization, driving people strategy, organizational effectiveness, and talent development in alignment with StackAdapt's company objectives. This is a high-impact leadership role within the People & Culture team, requiring deep expertise in employee relations, org design, and change management at scale.

You will collaborate closely with leaders across Finance, Legal, and other G&A functions, as well as cross-functional partners in Talent Acquisition, Total Rewards, People Operations, and Learning & Development to deliver integrated people programs. This role reports to the Director, People Business Partners.

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

What You'll Be Doing:

• Partner with senior business leaders to design and execute people strategies that drive organizational effectiveness, talent retention, and high-performance culture.
• Lead complex employee relations investigations and resolution processes, applying sound judgment and ensuring legal compliance across Canadian and global jurisdictions.
• Lead a team of global People Business Partners while partnering with senior business leaders to design and execute people strategies that drive organizational effectiveness, talent retention, and high-performance culture.
• Consult on org design, workforce planning, and restructuring initiatives, providing data-informed recommendations to business and People leadership.
• Coach and develop people managers on leadership effectiveness, performance management, and team engagement.
• Collaborate with Centers of Excellence (Talent Acquisition, Total Rewards, L&D, People Ops) to deliver integrated HR programs aligned to business priorities.
• In your first six months, you will focus on building trusted relationships with your assigned business unit leaders, conducting a landscape assessment of current people priorities and talent gaps, and completing at least one end-to-end org design or workforce planning initiative. You will also lead employee relations cases independently, support a performance cycle, and co-develop a people roadmap for your client groups aligned to StackAdapt's 2026 company objectives.
• Employee relations: Resolve 90%+ of ER cases within agreed SLA timelines.
• Org design: Deliver at least one documented org design or workforce planning project within the first 6 months.
• Manager capability: Demonstrate measurable improvement in manager effectiveness scores in assigned client groups within 12 months.
• Retention: Contribute to a regrettable attrition rate at or below team target for assigned business units.

What You'll Bring to the Table

• 7+ years of progressive HR Business Partner experience, including at least 3 years in a senior or lead HRBP role supporting complex, fast-paced organizations.
• Demonstrated experience leading org design, workforce planning, and change management initiatives at scale.
• Deep expertise in Canadian employment law and employee relations practices across multiple provinces; global employment law knowledge is a valuable asset.
• Proven ability to build trusted advisory relationships with VP and C-suite leaders, influencing decisions through data, business acumen, and credibility.
• Track record of coaching and developing managers and teams to elevate leadership capability and engagement.