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Marketing Science Intern

Criticalmass

Toronto permanent

Posted: February 19, 2026

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Quick Summary

Marketing Science Intern at Critical Mass, Toronto, with a competitive stipend and hands-on client work experience.

Job Description

Critical Mass’ Internship opportunities are part of our Trailhead Program and provide a 12-week jump-start to your career. The program is designed to fast-track your growth through regular learning opportunities, mentorship, and hands-on client work - all while earning a competitive stipend. You’ll get a firsthand look at the exciting work we do at Critical Mass and experience what it’s like to be an integral part of our team. This internship gives you the chance to explore the digital agency world and client projects to see if it’s the right fit for you.

Our internship will run from May 26 – August 14.

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 the Toronto office on Tuesdays and Thursdays.

As the Marketing Science Intern you will gain understanding of all aspects of how Marketing Science contributes to Critical Mass’ client offerings. You will learn about the day-to-day activities of the marketing science program and assist in developing innovative products and deliverables. The major objective is to perfect existing skills, learn and understand new measurement methods and tools used to capture, assemble and organize data into something meaningful.

 You Will:

• Collaborate with other interns on a client and global intern project.

• Use web analytics, social, survey, and mobile measurement tools

• Develop tagging requirements, test and perform data quality assurance

• QA, identify issues, document and debug code and software issues working with Tech team

• Use Excel, Tableau, or DW/BI reporting system management

• Test software management and develop testing strategies

• Develop and analyze segmentation data, social media data, survey responses, market share information, web behavioral analysis

• Generate reporting and analysis, interpreting web analytics

• Use statistical analysis / data science tools like R, Python, or SPSS

• Analyze site traffic, search, and e-commerce analysis

• Have experience with A/B or multivariate testing results analysis

• Assist in analysis presentation development (story telling with data), internal and client team presentation of analysis

You Have:

• An interest in digital marketing and how organizations use social media in their campaigns

• Proficiency with Excel

• Excellent attention to detail and naturally strong memory

• Experience using the scientific method

• Active listening skills

• Solution-oriented thinking capabilities

• Good communication and writing skills

• Currently in 2nd or 3rd year of a 4-year degree or 1st year of a 2-year specialization program

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
$40,000—$40,000 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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