Senior Buyer (Video & Audio), Cossette Media

Who We AreMekanism is a full-service modern agency making unexpected ideas unstoppable through the power of Soul & Science. We partner with brands to unleash breakthrough creativity and drive impact across the entire customer journey, delivering brand building at full volume.
With eight offices spanning markets throughout the US and Canada, we serve as collaborative business partners to some of the world’s best North American brands, including Alaska Airlines, Jose Cuervo, Quaker, Ben & Jerry's, and Amtrak in the US, and CAMH, Koodo Mobile and Public Mobile in Canada.
Named a Top 10 Most Effective Independent Agency in the US by the Effie Index, Mekanism has been profiled by The New York Times, Fast Company, and ABC’s Nightline. Our campaign methodologies are studied by Harvard Business School. For more information, Mekanism.Com.
Transparency matters to us.
For this role, you can expect a salary between $60,000 – $65,000 annually, depending on experience. This is for a new vacancy.
We are looking for an articulate, relentlessly curious, and experienced
Senior Video/Audio Buyer
who thrives in client conversations, brings undeniable energy to the work, and brings deep media buying expertise to the team. This role centers on platform-agnostic planning and buying across
Linear TV, Connected TV, Online Video, Radio, Podcasts, and Music Streaming. You will serve as a lead voice, trusted client partner, and media specialist across our cross-channel campaigns.
Key Responsibilities
Client Lead & Key Presenter:
Serve as a primary voice in client meetings, confidently leading discussions, co-presenting, and walking clients through pre/post-buy decks, strategic POVs, and industry trend updates.
Campaign Execution & Optimization:
Lead the hands-on setup, management, and ongoing optimization of
digital, programmatic, and traditional video and audio campaigns.
Media Partner Relationships:
Build strong, collaborative relationships with media sales representatives to negotiate pricing, unlock fresh opportunities, and secure prime placements for clients.
Campaign Strategy & Storytelling:
Partner closely with our 360 planning team to execute campaigns, monitor performance data, and translate numbers into clear, compelling strategic stories for clients.
Financial & Budget Oversight:
Ensure total accuracy across campaign setups, budget tracking, and day-to-day execution.
Industry Insights:
Stay on top of video and audio media trends, sharing actionable recommendations and thought leadership with both internal teams and clients.
Qualifications
3+ Years of Media Experience:
Strong agency background focused on media buying, planning, and executing digital video and audio campaigns.
Digital & Programmatic Expertise:
Practical experience setting up and managing campaigns across digital platforms, ad networks, and streaming channels.
Proven Track Record:
Experience managing media budgets and optimizing campaigns to meet client performance goals across both digital and traditional channels.
Exceptional Communication Skills:
Dynamic, articulate, and confident when presenting ideas to clients and internal stakeholders.
Vendor Network:
Established, positive relationships with key media sales partners across video and audio channels.
Tools & Software:
Nice to have proficient in one of these platforms- Google Ads, TTD, DV360, Amazon. Including Google Suite (Sheets, Slides, Gmail) and Microsoft Office (Excel, PowerPoint).
Driven by a curiosity of leveraging AI tools to advance our clients work and objectives.
What’s in it for you:We value the ‘whole you’
An innovative and entrepreneurial work environment that promotes ingenuity and individuality - with the best of colleagues, and the best of clients
Hybrid work models and flexible hours, plus a work from anywhere policy for short-term stays in other regions
Generous Vacation starting at 3 weeks + 1 extra week over the holidays
Agency summer days (exact policy differs per campus and agency)
Modern, open co-working spaces with coffee & snack bars, located in great city neighborhoods, close to shops and restaurants and easy access to public transport
Dogs allowed, dedicated Play Room to support families and Private wellness room (in select offices)
Team social events - holiday parties, seasonal gatherings, weekly happy hours, inspiring speakers and more!
We are obsessed with learning and being better humans
In-house learning & development sessions and annual career and growth conversations’
Access to internal network of opportunities across all agencies
Focus on developing BIMPOC Talent via our BIMPOC Mentorship Program
Internal EDI group(s), programs & initiatives across Plus Company and opportunities to be involved in employee resource group(s)
Check out our EDI report here to learn more about our work and commitment towards equity.
We invest in your health and wellness:
Flexible benefits to support your individual lifestyle and life stage – with access to a personal wellness spending account you can use for a wide range of wellness expenses, including gym membership fees, pet care, education expenses, and much more!
Comprehensive mental health support including access to a virtual mental health therapy clinic providing you with personalized therapist guided iCBT programs and live therapy, access to health clinicians 24/7, and a holistic array of other health and wellness resources to support you and your family.
Dedicated play rooms for days you need to bring the kids and health and wellness rooms when you need a place to get grounded.
A responsible sick & personal absence days policy designed so you don't have to worry the moment a personal obligation or emergency arises.
Maternity leave top up program.
Expiry Date Notice: This job description expires on November 22, 2026.
We’re humbled by the number of talented people who apply to work with us every day. And, we thank each and every one of you. Truly. We’ll reach out directly to those we’d like to meet for an interview.
To ensure a fair and consistent evaluation for all candidates, our interviewers are supported by an AI tool that securely takes notes during the conversation
Creating meaningful work means embracing different perspectives. We are an equal opportunity employer and do not discriminate based on age, colour, ability, national origin, race, religion, sex, or sexual orientation. Not only are these provisions protected by provincial and federal law, embracing difference is what makes Mekanismwhat it is—and we wouldn’t have it any other way. We pride ourselves on our inclusive and accessible workplace. If you need any accommodations during the interview process to make it work for you, let us know.
By joiningMekanism, you become part of Plus Company, a unique partnership of forward-thinking creative agencies. As a network, we unabashedly believe anything is possible. Why? Because possibility is what powers the big dreams and limitless drive of an entrepreneur. And entrepreneurial agencies are what we’re made of. A whole network of them.
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