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Senior Human Resources Business Partner (Contract)

Toronto

At Critical Mass, people are at the heart of everything we do. As a Contract Senior HR Business Partner (Sr HRBP), you will play a pivotal role in shaping our inclusive, high performing culture across both our Toronto and New York offices. You’ll be a trusted advisor to leadership and employees alike, fostering strong cross office relationships, driving key HR initiatives, and championing our commitment to employee growth, engagement, and wellbeing. This is an exciting opportunity for a dynamic HR leader to make a tangible impact—leveraging strategic expertise, business acumen, and a passion for people to propel our organization forward.

Please note that this is a contract position with a requirement to be on location in our Toronto office.

You Will:

  • Cultivate strong, authentic partnerships with client leads, creative directors, and employees across Toronto and New York, ensuring each office feels equally supported and connected
  • Support the entire employee life cycle—onboarding, development, engagement, performance management, and beyond—with a focus on creating an exceptional, inclusive workplace
  • Serve as a strategic thought partner to our General Manager in New York and other senior leaders, providing expert HR guidance and executive coaching while acting as the primary HR point of contact for both locations
  • Proactively manage and resolve complex employee relations matters, including investigations and conflict resolution, ensuring fair, consistent, and compliant outcomes
  • Lead impactful communications and presentations while supporting organizational change initiatives and drive the successful rollout of HR programs and talent initiatives
  • Gather, interpret, and report on HR data and metrics (including turnover, engagement, and talent gaps), providing actionable insights to business leaders and making evidence-based recommendations
  • Champion diversity, equity, and inclusion, ensuring our practices reflect our values and supporting a culture where every employee can thrive
  • Maintain regular connection with the New York office—including as needed travel—to foster relationships and support onsite needs

 

 You Have:

  • 5–7+ years’ progressive HR experience in complex, fast paced environments (marketing/agency experience is a plus, but not required)
  • Depth in HR disciplines such as talent management, compensation & benefits, employee/labor relations, risk management, change management, and HR technology, with proven ability to interpret and implement HR strategy
  • Working knowledge of both US and Canadian employment law—able to make sound, compliant decisions in both regions.
  • Exceptional communication, stakeholder management, and executive partnering skills and the ability to influence and coach senior leaders with credibility and confidence
  • Strong analytical and critical thinking skills, with the ability to independently assess data, identify trends, and recommend solutions
  • Experience leading or contributing to HR projects and supporting organizational change, including talent initiatives and succession planning
  • Proficiency in Microsoft Office Suite (especially Excel), documentation, reporting, and virtual collaboration tools
  • Agility, empathy, and accountability, with a proven ability to build trust, foster inclusion, and operate effectively within ambiguity and change

This position requires regular travel between Canada and the United States. Candidates must be able to travel freely between both countries.

What We Offer:

  • Global maternity and parental leave
  • Competitive benefits packages
  • Vacation, compassionate leave, sick days, and flex days
  • Access to online services for families and new parents
  • Diversity and Inclusion Board with 12 affinity groups
  • Internal learning and development programs
  • Enterprise-wide employee discounts

 

Our new hires & employees are the future of our organization, and we want to set you up for long-term success. In an effort to do so, we expect our team to work from an office a minimum of 3 days a week.

 

 

Critical Mass is an equal opportunity employer. 

The Critical Mass Talent Acquisition team will only communicate from email addresses that use the URLs criticalmass.com, omc.com and us.greenhouse-mail.io. We will not use apps such as Facebook Messenger, WhatsApp, or Google Hangouts for communicating with you. We will never ask you to send us money, technology, or anything else to work for our company. If you believe you are the victim of a scam, please review your local government consumer protections guidance and reach out to them directly.

If U.S. based: https://www.consumer.ftc.gov/articles/job-scams#avoid
If Canada based: https://www.canada.ca/en/services/finance/consumer-affairs.html
If U.K. based: https://www.gov.uk/consumer-protection-rights
If Costa Rica based: https://www.consumo.go.cr/educacion_consumidor/consejos_practicos.aspx 

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DE&I Questionnaire

Voluntary Self-Identification

At Critical Mass, we are dedicated and determined to build a workforce that reflects the diversity of the communities in which we live and work. It is crucial that every team member can thrive and reach their full potential.

With that said, we’d like to know a little more about you. We ask all applicants to fill out the below voluntary self-identification questions in order to evaluate and improve our recruitment and diversity efforts. Answering is completely voluntary and will not affect the outcome of your application.

The data collected may be reviewed by the Critical Mass Talent Acquisition Team, Human Resources, our Diversity, Equality and Inclusion team, and our executives, but they will neither be reviewed by nor disclosed to anyone else. All the information that you share with us pursuant to this survey will be stored on our secure network servers located within Canada and the United States.  We will only retain this information so long as it is necessary for the purpose that we have described here or as may be required by applicable laws. Thereafter, we will either anonymize the information or delete it entirely.  If you elect to complete this survey, and at any point in the future you wish to retract or amend your responses, or otherwise have any questions about your data, you may contact our Talent Acquisition team at accommodations@criticalmass.com.

As set forth in Critical Mass’s Equal Employment Opportunity policy, we do not discriminate on the basis of any protected group status under any applicable law.

Aboriginal Peoples Definition:

Aboriginal Peoples means persons who are defined as: Indians (more commonly referred to as First Nations), Inuit, or Métis.

Members of Visible Minorities Definition:

Members of Visible Minorities means persons, other than Aboriginal people, who are non-Caucasian in race or non-white in color.
Examples:
Black (e.g. African, Caribbean, Other)
Arab (e.g. Middle Eastern, North African, etc.) 
Asian and Southeast Asian (e.g. Chinese, Japanese, Korean, Vietnamese, Cambodian, Laotian, Thais, etc.) 
West Asian (e.g. Armenian, Iranian, Persian, Egyptian, Turkish, etc.)
Other (e.g. Latin American, Pacific Islander, etc.) 

Persons with Disabilities Definition:

Persons with Disabilities means persons who have a physical or mental impairment or medical condition that substantially limits a major life activity, or if you have a history or record of such an impairment or medical condition.

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