Senior Media Buyer (Meta + TikTok) - Agency

Media Stack is a network of ecommerce specialists with 50+ years of combined experience across paid media, creative strategy, and CRO. We work with ambitious consumer brands across fashion, beauty, and wellness, and we're building a team of people who take genuine ownership over their work and care about the results as much as our clients do.

The Role
We're looking for a Senior Media Buyer to take the lead across a number of paid social accounts at Media Stack. This is a full-time, remote role for someone who is as comfortable in the data as they are in a client call — and is able to lead and craft the creative strategy.

You'll be managing and scaling campaigns across Meta and TikTok for a portfolio of ecommerce clients, working closely with our in-house Creative Strategist, and helping shape how the paid media function operates at the agency. This is a leadership role as much as an execution role.

What You'll Be Doing
Planning, executing, and optimising paid social campaigns across Meta, TikTok, and other paid social channels
Collaborating closely with our in-house Creative Strategist — you'll be the key performance input, feeding data-driven insights into the creative process to inform what gets made and tested next
Leading on creative strategy from a performance perspective — analysing what's working, identifying winning angles, and briefing creative on hooks, formats, and messaging
Owning client relationships directly — communicating performance clearly, proactively flagging issues, and building trust
Forecasting, budget pacing, and reallocation across accounts to maximise performance
Setting up and interpreting A/B tests across creatives, audiences, and bidding strategies
Applying attribution modelling knowledge to reporting and client-facing analysis
Contributing to how the paid media department is built and run

What We're Looking For
7+ years managing paid social campaigns, primarily Meta and TikTok
Proven track record with ecommerce consumer brands — fashion, beauty, and/or wellness
Strong analytical ability — attribution modelling, ROAS, CAC, funnel dynamics
A genuine creative strategist — you understand why an ad works, not just whether it does
Direct client-facing experience — you're transparent, articulate, and proactive
Someone entrepreneurial — if you've run your own venture at some point, even better
Advanced in Excel or Google Sheets for reporting and analysis
Familiarity with Motion (creative strategy tool) — not a hard requirement, but a strong preference
Comfortable working independently in a remote environment
Agency experience is a strong plus; brand-side experience also valued
Someone that is always looking to improve process efficiencies.
AI native to support with work.

You’ll Thrive Here If You
Want to own a channel, not just execute on it
Have strong opinions about creative and can back them up with data
Are energised by fast-moving ecommerce environments
Treat clients like partners, not accounts
Are naturally entrepreneurial and take initiative without being asked

Interview Process
You'll be asked to complete a full account audit of one of our client accounts as part of the process.

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