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Associate Media Planner, Social Buyer

Criticalmass

Toronto permanent

Posted: April 9, 2026

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Quick Summary

Develop effective social media campaigns using platform tools and data to activate and steward buys to meet KPIs in a collaborative and creative environment.

Job Description

As an Associate Media Planner, Social Buying, you will support all aspects of paid social, including activating campaigns using platform tools and data, collaborating with team members to launch campaigns and special projects, and stewarding buys to ensure KPIs are met. We’re looking for someone eager to learn, grow, and contribute in a collaborative, creative environment that supports professional development. The role offers exposure to cross-functional teams and a variety of marketing programs across sectors and objectives, while building depth in paid social media.

You Will:

• Develop tactical media plans that include audience, creative and other strategies designed to meet the goals of a given campaign.

• Collaborate with the planning team to develop RFPs and the social team to analyze and determine recommended partners.

• Launch paid social campaigns on platforms that may include, Facebook, Instagram, TikTok, Twitter, Pinterest, and LinkedIn.

• Support the Media team in pushing the boundaries of media planning, while focusing on core business.

• Foster strong relationships within the team and across implementation partners; providing direction on segmentation, targeting/placement, flighting, and trafficking.

• Provide input on placement naming convention and trafficking strategy.

• Review performance reports, extract actionable insights, i.e., explaining the why behind the data, and recommend optimizations.

• Keep a finger on the pulse of media and marketing trends, tactics, and emerging opportunities, especially amongst the social channels (e.g., Clubhouse, Twitch etc.).

• Read industry trades and share relevant content with others.

• Continuously and proactively provide suggestions as to how we might accelerate the client’s growth; ranging from tried & true (elsewhere) to unexpected & promising.

You Have:

• Exposure or general understanding of digital media, or relevant capstone projects or internships.

• Proficient in MS Office, specifically Excel.

• Strong communicator with excellent interpersonal, written, and verbal skills.

• Collaborative and solution‑oriented.

• Highly organized and detail‑oriented, with strong project management skills including the ability to multitask and meet tight deadlines.

• Self‑motivated, adaptable, and able to work independently with minimal supervision in fast‑paced, high‑pressure environments.

• Energetic and resourceful, producing high‑quality work quickly while remaining flexible, curious, and creative.

Nice to Have:

• Media experience through a full-time role or internships is a plus

What We Offer:

• Global maternity and parental leave

• Competitive benefits packages

• Vacation, compassionate leave, personal/sick days, and flex days

• Access to online services for families and new parents

• Early Dismissal Friday’s (off at 3:00 PM local time every Friday)

• 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 2 days a week.

Please note, you are applying to an active job opening.

We continually review ranges to address skills, experience and markets. Base salaries are determined during our interview process, by assessing a number of factors that include, but aren’t limited to, a candidate’s experience and skills relative to the scope and responsibilities of the position. For current CM employees, tenure will also be a consideration.
Salary Range
$55,000—$65,000 CAD

Critical Mass is an equal opportunity employer.

Critical Mass uses artificial intelligence in our recruitment process to enhance job postings, filter keywords during the review of prospective candidates, and, in some cases, transcribe interviews with our recruiters. Human review remains central to the process, and all hiring decisions are ultimately made by our team.

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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